Alert archive / Wyoming / Blizzard Warnings in 2023

Blizzard Warning 2, NWS Riverton, WY

April 3, 2023Fremont County, Natrona County, Sweetwater County, Wyoming

NWS Riverton, WY issued this blizzard warning at Apr 3, 2023, 2:43 PM MDT for Fremont County, Natrona County, Sweetwater County, Wyoming. It was in force for 27 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Apr 3, 2023, 2:43 PM MDT (20:43 UTC)
Expired
Apr 4, 2023, 6:00 PM MDT
In force
27 hr
Issued by
NWS Riverton, WY

Counties Fremont County, WY, Natrona County, WY, Sweetwater County, WY

The radar

The Riverton/Lander radar (KRIW), 65 km from the middle of the area, began a volume at 20:47 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Apr 4, 11:00 AM MDTSNOW 10.54 Wnw Riverton, WY

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 8.7 hours before the alert went out and 62 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2023-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2023-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
79 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
-98 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

616 
WWUS45 KRIW 032043
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
243 PM MDT Mon Apr 3 2023

WYZ019-041200-
/O.UPG.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
/O.NEW.KRIW.BZ.W.0002.230403T2043Z-230405T0000Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
243 PM MDT Mon Apr 3 2023

...BLIZZARD WARNING IN EFFECT UNTIL 6 PM MDT TUESDAY...

* WHAT...Blizzard conditions. Additional snow accumulations of 12
  to 24 inches. Winds gusting as high as 70 mph.

* WHERE...Green Mountains and Rattlesnake Range.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible.
  Widespread blowing snow will significantly reduce visibility. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ020-022-041200-
/O.UPG.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
/O.NEW.KRIW.BZ.W.0002.230403T2043Z-230405T0000Z/
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
243 PM MDT Mon Apr 3 2023

...BLIZZARD WARNING IN EFFECT UNTIL 6 PM MDT TUESDAY...

* WHAT...Blizzard conditions. Additional snow accumulations of 15
  to 20 inches, with higher amounts on Casper Mountain. Winds 
  gusting as high as 65 mph.

* WHERE...Natrona County Lower Elevations and Casper Mountain.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible.
  Widespread blowing snow could significantly reduce visibility. 


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ024-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Salt River and Wyoming Ranges-
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 6 to 12 
  inches.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult at times, especially over 
  Salt River Pass at times.

* ADDITIONAL DETAILS...Please monitor the Bridger-Teton 
  Avalanche Center at bridger teton avalanche center.org, if 
  your plans include travel into the backcountry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ028>030-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Rock Springs, Green River, and Wamsutter
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 8 to 12
  inches. Winds gusting as high as 50 mph.

* WHERE...Rock Springs and Green River, Flaming Gorge and East 
  Sweetwater County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible, 
  especially during the morning commutes. The combination of 
  snow and wind could create localized white-out conditions at 
  times.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ017-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Basin-
Including the cities of Riverton and Shoshoni
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 10 to 14
  inches. Winds gusting as high as 50 mph.

* WHERE...Wind River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult, especially tonight 
  and Tuesday morning. The combination of snow and wind could 
  create white-out conditions at times especially over the 
  northern portions of the Basin.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ009>011-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-
Including the cities of Buffalo and Kaycee
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 6 to 12
  inches for lower elevations and 12 to 18 inches for mountains.
  Winds gusting as high as 60 mph.

* WHERE...Bighorn Mountains Southeast, Northeast Johnson County 
  and Southeast Johnson County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult tonight and Tuesday 
  morning. Blowing snow could significantly reduce visibility.

* ADDITIONAL DETAILS...While snow may begin across far southern 
  Johnson County this afternoon, the heaviest snow and strongest 
  wind are expected from this evening through midday Tuesday. 
  The heaviest snow is likely to fall in the southern Bighorn 
  Range over far southern Johnson County near the Natrona County 
  line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ015-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains East-
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 18 to 24 
  inches. Winds gusting as high as 60 mph.

* WHERE...Wind River Mountains East.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will become impossible over South Pass later 
  this afternoon into this evening. Highway 28...including South 
  Pass will likely have a prolonged road closure.

* ADDITIONAL DETAILS...The northern portion of the range 
  including Union Pass should only receive 5 to 10 inches of 
  snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ005-007-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Southwest Big Horn Basin-Owl Creek and Bridger Mountains-
Including the city of Thermopolis
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8
  inches in the lower elevations and 8 to 12 inches in the
  mountains. Winds gusting as high as 60 mph.

* WHERE...Southwest Big Horn Basin and Owl Creek and Bridger 
  Mountains.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could become difficult tonight and Tuesday 
  morning. Blowing snow could significantly reduce visibility 
  especially in the mountains.

* ADDITIONAL DETAILS...Accumulations will likely be light this 
  afternoon, but will increase after sunset.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ018-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Lander Foothills-
Including the city of Lander
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 12 to 18 
  inches. Winds gusting as high as 45 mph.

* WHERE...Lander Foothills.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult especially for the 
  Tuesday morning commute.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ026-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Upper Green River Basin-
Including the cities of La Barge, Big Piney, and Farson
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 6
  inches. Winds gusting as high as 50 mph.

* WHERE...Upper Green River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult at times.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ027-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches.

* WHERE...South Lincoln County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult at times.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ014-041200-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains West-
243 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches. Winds gusting as high as 70 mph.

* WHERE...Wind River Mountains West.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel over South Pass will become impossible later 
  this afternoon and evening. A prolonged road closure of 
  Highway 28 including South Pass is likely.

* ADDITIONAL DETAILS...The strong winds will result in 
  considerable blowing and drifting of snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ023-041200-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Star Valley-
Including the cities of Afton, Alpine, Star Valley Ranch, 
and Thayne
243 PM MDT Mon Apr 3 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Snow. Additional snow accumulations of 4 to 6 inches.

* WHERE...Star Valley.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Slick and hazardous travel expected.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ016-041200-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Upper Wind River Basin-
Including the city of Dubois
243 PM MDT Mon Apr 3 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Snow. Additional snow accumulations of 2 to 11 inches. 
  Winds gusting as high as 45 mph.

* WHERE...Upper Wind River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult, but become very difficult 
  the farther southeast your travel in the Wind River Basin.

* ADDITIONAL DETAILS...Snow may melt during the afternoon, 
  especially on paved surfaces, which could lead to a 
  combination of wet and slick roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
4 follow-up statements
137 
WWUS45 KRIW 040409
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1009 PM MDT Mon Apr 3 2023

WYZ020-022-041300-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
1009 PM MDT Mon Apr 3 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT TUESDAY...

* WHAT...Blizzard conditions. Total snow accumulation of 24 to 30
  inches by Tuesday afternoon. Total snow accumulation of 30 to 40
  inches for Casper Mountain. Winds gusting 40 to 50 mph.

* WHERE...Natrona County Lower Elevations and Casper Mountain.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible.
  Widespread blowing snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ019-041300-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
1009 PM MDT Mon Apr 3 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT TUESDAY...

* WHAT...Blizzard conditions. Total snow accumulation of 20 to 30
  inches by Tuesday afternoon. Winds gusting 45 to 55 mph, with
  gusts up to 65 mph in the mountains.

* WHERE...Green Mountains and Rattlesnake Range.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible.
  Widespread blowing snow will significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ024-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Salt River and Wyoming Ranges-
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult at times, especially over 
  Salt River Pass at times.

* ADDITIONAL DETAILS...Please monitor the Bridger-Teton 
  Avalanche Center at bridger teton avalanche center.org, if 
  your plans include travel into the backcountry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ028>030-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Rock Springs, Green River, and Wamsutter
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches. Winds gusting as high as 45 mph.

* WHERE...Rock Springs and Green River, Flaming Gorge and East 
  Sweetwater County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult to impossible,
  especially during the morning commute. The combination of snow 
  and wind could create localized white-out conditions at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ017-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Basin-
Including the cities of Riverton and Shoshoni
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulations of 8 to 14 inches
  from Riverton to Hudson. Total snow accumulation of 3 to 6
  inches near Shoshoni. Wind gusting 30 to 40 mph.

* WHERE...Wind River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult, especially tonight and
  Tuesday morning. The combination of snow and wind could create
  white-out conditions at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ009>011-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-
Including the cities of Buffalo and Kaycee
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulations of 12 to 20 inches
  for lower elevations and 15 to 25 inches for mountains through
  Tuesday afternoon. Winds gusting 30 to 40 mph, with gusts over
  50 mph in the mountains.

* WHERE...Bighorn Mountains Southeast, Northeast Johnson County 
  and Southeast Johnson County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult tonight and Tuesday
  morning. Blowing snow could significantly reduce visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ015-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains East-
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulations of 20 to 30 inches.
  Winds gusting as high as 50 mph.

* WHERE...Wind River Mountains East.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel over South Pass may be impossible.

* ADDITIONAL DETAILS...The northern portion of the range including
  Union Pass should only receive 5 to 10 total inches of snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ005-007-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Southwest Big Horn Basin-Owl Creek and Bridger Mountains-
Including the city of Thermopolis
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulations of 4 to 8 inches in
  the lower elevations and 10 to 20 inches in the mountains. Winds
  gusting as high as 50 mph.

* WHERE...Southwest Big Horn Basin and Owl Creek and Bridger 
  Mountains.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could become difficult tonight and Tuesday
  morning. Blowing snow could significantly reduce visibility
  especially in the mountains.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ018-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Lander Foothills-
Including the city of Lander
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulation of 12 to 18 inches. 
  Winds gusting as high as 35 mph.

* WHERE...Lander Foothills.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult, especially for the
  Tuesday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ026-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Upper Green River Basin-
Including the cities of La Barge, Big Piney, and Farson
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Total snow accumulations of 4 to 6 inches.

* WHERE...Upper Green River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ027-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8 
  inches.

* WHERE...South Lincoln County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ014-041300-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains West-
1009 PM MDT Mon Apr 3 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Heavy snow. Additional snow accumulations of 4 to 8
  inches. Additional snow accumulations of 10 to 15 inches near 
  Atlantic City. Winds gusting as high as 65 mph.

* WHERE...Wind River Mountains West.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will be very difficult to impossible along
  Highway 28.

* ADDITIONAL DETAILS...The strong winds will result in 
  considerable blowing and drifting of snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ023-041300-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Star Valley-
Including the cities of Afton, Alpine, Star Valley Ranch, 
and Thayne
1009 PM MDT Mon Apr 3 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches.

* WHERE...Star Valley.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Slick and hazardous travel expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ016-041300-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Upper Wind River Basin-
Including the city of Dubois
1009 PM MDT Mon Apr 3 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT
TUESDAY...

* WHAT...Snow. Additional snow accumulations of 2 to 4 inches.
  Winds gusting 20 to 30 mph.

* WHERE...Upper Wind River Basin.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
514 
WWUS45 KRIW 040934
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
334 AM MDT Tue Apr 4 2023

WYZ024-026-041045-
/O.CAN.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Salt River and Wyoming Ranges-Upper Green River Basin-
Including the cities of La Barge, Big Piney, and Farson
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING IS CANCELLED...

Light snow will continue today, but additional snowfall amounts 
are expected to generally be 2 to 4 inches in the mountains, and 
an inch or less in the lower elevations. Also winds will generally
be light.

$$

WYZ023-041045-
/O.CAN.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Star Valley-
Including the cities of Afton, Alpine, Star Valley Ranch, 
and Thayne
334 AM MDT Tue Apr 4 2023

...WINTER WEATHER ADVISORY IS CANCELLED...

Periods of light snow will occur in Star Valley today.  
Additional snowfall between 1 and 2 inches could occur. Winds 
will generally be light, and temperatures should be warm enough
that roads should become generally wet in the afternoon.

$$

WYZ030-050000-
/O.UPG.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
/O.EXA.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
East Sweetwater County-
Including the city of Wamsutter
334 AM MDT Tue Apr 4 2023

...BLIZZARD WARNING IN EFFECT UNTIL 6 PM MDT THIS EVENING...

* WHAT...Blizzard conditions with significant blowing and drifting
  of snow. Additional snow accumulations of 2 to 4 inches.
  Northeast winds between 25 and 35 mph, with gusts to around 45
  mph expected this morning, decreasing gradually in the 
  afternoon.
 
* WHERE...East Sweetwater County.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be impossible, especially during the
  morning commute. Flight delays and possibly cancellations are
  possible. Interstate 80 will likely be closed across eastern
  Sweetwater County for a prolonged period. 

* ADDITIONAL DETAILS...Only travel in emergencies.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ020-022-050000-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
334 AM MDT Tue Apr 4 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions with significant blowing and drifting
  of snow. Snow drifts will be several feet high. Additional snow
  accumulations of 2 to 5 inches in the lower elevations, and 8 
  to 12 inches on Casper Mountain. Northeast winds between 15 and 
  25 mph with gusts to 35 mph will occur today. 

* WHERE...Natrona County Lower Elevations and Casper Mountain.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will be impossible in rural areas, and
  difficult in Casper. Stay home if possible, especially this
  morning. Prolonged road closures are expected.

* ADDITIONAL DETAILS...White-out conditions will occur in rural
  areas. Flight delays and possible cancellations could occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ019-050000-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
334 AM MDT Tue Apr 4 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions with significant blowing and drifting
  of snow. Snow drifts will be several feet high. Additional snow
  accumulations of 4 to 8 inches. Northeast winds between 20 and
  30 mph with gusts to 45 mph will occur today. 

* WHERE...Green Mountains and Rattlesnake Range.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will be impossible. Highways in southeast
  Fremont County could be closed for a couple of days.

* ADDITIONAL DETAILS...White-out conditions will occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ017-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Basin-
Including the cities of Riverton and Shoshoni
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow, moderate at times. Additional snow
  accumulations of 2 to 5 inches with the highest amounts toward
  the Lander Foothills. Areas of blowing and drifting snow will
  also occur with winds 15 to 25 mph with gusts 30 to 40 mph.

* WHERE...Wind River Basin including Hudson, Pavillion, Riverton
  and Shoshoni.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult, especially this morning. 

* ADDITIONAL DETAILS...In heavier snow bursts and blowing snow,
  visibility will be reduced to a quarter mile.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ009>011-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-
Including the cities of Buffalo and Kaycee
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow, moderate at times. Additional snow
  accumulations of 3 to 6 inches. Blowing and drifting of snow
  will also occur with northerly winds between 25 and 35 mph with
  gusts between 40 and 50 mph. 

* WHERE...Bighorn Mountains Southeast, and Johnson County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult today with visibilities
  down at times below a quarter mile. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ015-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains East-
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Heavy snow. Additional snow accumulations of 8 to 12
  inches over central and southern areas of the eastern slopes of
  the Wind River Mountains including South Pass. Only 2 to 4
  inches over the north including Union Pass. Northeast winds
  between 20 and 30 mph with gusts around 45 mph decreasing in the
  afternoon.

* WHERE...Wind River Mountains East.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel over South Pass will be impossible today. 
  Highway 28 over South Pass could be closed for a couple of days.

* ADDITIONAL DETAILS...Significant blowing and drifting of snow
  with drifts of several feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ005-007-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Southwest Big Horn Basin-Owl Creek and Bridger Mountains-
Including the city of Thermopolis
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow, mainly light. Additional snow 
  accumulations of 1 to 2 inches in the lower elevations, and 4 to
  8 inches in the mountains. Winds gusting as high as 45 mph in 
  the mountains.

* WHERE...Southwest Big Horn Basin and Owl Creek and Bridger
  Mountains. This includes Thermopolis and the Wind River Canyon.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Roads will be slick and hazardous in spots, mainly 
  this morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ018-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Lander Foothills-
Including the city of Lander
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow, moderate at times. Additional snow
  accumulations of 3 to 6 inches. 

* WHERE...Lander Foothills.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will be difficult this morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ027-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow, briefly moderate. Additional snow 
  accumulations of 2 to 4 inches.

* WHERE...South Lincoln County.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be difficult at times, mainly this 
  morning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ014-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains West-
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow. Additional snow accumulations of 2 to 4
  inches above 9000 feet. Strong northeast winds between 30 and 
  40 mph with gusts 55 to 65 mph will weak considerable by noon.

* WHERE...Wind River Mountains West.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel will be impossible along Highway 28 especially
  the farther east. Highway 28 over South Pass could be closed for
  a couple of days.

* ADDITIONAL DETAILS...The strong winds will result in
  considerable blowing and drifting of snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ028-029-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Rock Springs and Green River-Flaming Gorge-
Including the cities of Rock Springs and Green River
334 AM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of snow with areas of blowing and drifting of
  snow. Additional snow accumulations of 2 to 4 inches. Winds 
  gusting as high as 40 mph.

* WHERE...Western third of Sweetwater County including Rock
  Springs and Green River.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Travel could be very difficult, especially during the
  morning commute. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ016-050000-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Upper Wind River Basin-
Including the city of Dubois
334 AM MDT Tue Apr 4 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Periods of Snow, mainly light. Additional snow 
  accumulations of 1 to 2 inches. 

* WHERE...Upper Wind River Basin including Dubois and Crowheart.
  The heaviest snow will be around Crowheart.

* WHEN...Until 6 PM MDT Tuesday.

* IMPACTS...Roads will be slick and hazardous in spots, but 
  become difficult especially this morning southeast of Crowheart.

* ADDITIONAL DETAILS...Snow will likely melt on paved surfaces by
  midday. This will result in roads becoming wet by around midday.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

Team Riverton/21
466 
WWUS45 KRIW 042047
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
247 PM MDT Tue Apr 4 2023

WYZ020-022-050000-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
247 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions. with significant blowing and
  drifting of snow. Snow drifts will be several feet high.
  Additional snow accumulations of 1 to 3 inches with locally
  higher amounts on Casper Mountain. Winds gusting as high as 20 
  to 30 mph.

* WHERE...Natrona County Lower Elevations and Casper Mountain.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be impossible in rural areas, and
  difficult in Casper. Stay home if possible. Prolonged road 
  closures are expected.

* ADDITIONAL DETAILS...White-out conditions will occur in rural 
  areas. Flight delays and possible cancellations could occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ019-050000-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
247 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions with significant blowing and 
  drifting of snow. Snow drifts will be several feet 
  high. Additional snow accumulations of 1 to 2 inches. Winds 
  gusting as high as 40 to 50 mph.

* WHERE...Green Mountains and Rattlesnake Range.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be impossible. 

* ADDITIONAL DETAILS...White-out conditions will occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ030-050000-
/O.CON.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
East Sweetwater County-
Including the city of Wamsutter
247 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Blizzard conditions with significant blowing and drifting
  of snow. Additional snow accumulations of up to one inch. Winds
  gusting as high as 40 to 55 mph through the afternoon.

* WHERE...East Sweetwater County.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be difficult to impossible. Prolonged road
  closures are expected.

* ADDITIONAL DETAILS...Only travel in emergencies.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Travel should be restricted to emergencies only. If you must
travel, have a winter survival kit with you. If you get stranded,
stay with your vehicle. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ017-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Basin-
Including the cities of Riverton and Shoshoni
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of up to one inch.
  Winds gusting as high as 30 to 40 mph this afternoon.

* WHERE...Wind River Basin including Hudson, Pavillion, Riverton 
  and Shoshoni.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel could be difficult.

* ADDITIONAL DETAILS...In heavier snow bursts and blowing snow, 
  visibility will be reduced to a quarter mile.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ009>011-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-
Including the cities of Buffalo and Kaycee
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of 1 to 2 inches.
  Winds gusting as high as 35 to 45 mph.

* WHERE...Bighorn Mountains Southeast, and Johnson County.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel could be very difficult today with visibilities
  down at times below a quarter mile.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ015-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains East-
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow and blowing snow. Additional snow accumulations of 
  1 to 2 inches. Winds gusting 25 to 35 mph.

* WHERE...Wind River Mountains East.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel over South Pass will be impossible today.
  Prolonged road closures are expected.

* ADDITIONAL DETAILS...Significant blowing and drifting of snow 
  with drifts of several feet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ005-007-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Southwest Big Horn Basin-Owl Creek and Bridger Mountains-
Including the city of Thermopolis
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of around 1 inch. 
  Winds gusting 35 to 45 mph.

* WHERE...Southwest Big Horn Basin and Owl Creek and Bridger 
  Mountains. This includes Thermopolis and the Wind River Canyon.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Roads will be slick and hazardous in spots.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ018-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Lander Foothills-
Including the city of Lander
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of 1 to 2 inches. 

* WHERE...Lander Foothills.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be difficult at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ027-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Heavy snow. Additional snow accumulations of up to one 
  inch.

* WHERE...South Lincoln County.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel could be difficult at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ014-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains West-
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow and blowing snow. Additional snow accumulations of 
  up to one inch. Winds gusting as high as 25 to 35 mph.

* WHERE...Wind River Mountains West.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel will be impossible along Highway 28. Prolonged
  road closures are expected. 

* ADDITIONAL DETAILS...The strong winds will result in 
  considerable blowing and drifting of snow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ028-029-050000-
/O.CON.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Rock Springs and Green River-Flaming Gorge-
Including the cities of Rock Springs and Green River
247 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow and blowing snow. Additional snow accumulations of
  up to one inch. Winds gusting as high as 30 to 40 mph this
  afternoon.

* WHERE...Western third of Sweetwater County including Rock 
  Springs and Green River.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Travel could be very difficult. Significant blowing
  and drifting of snow is expected. Prolonged road closures are
  expected.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

WYZ016-050000-
/O.CON.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Upper Wind River Basin-
Including the city of Dubois
247 PM MDT Tue Apr 4 2023

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS
EVENING...

* WHAT...Snow. Additional snow accumulations of up to one inch.

* WHERE...Upper Wind River Basin including Dubois and Crowheart. 
  The heaviest snow will be around Crowheart.

* WHEN...Until 6 PM MDT this evening.

* IMPACTS...Roads will be slick and hazardous in spots, especially
  southeast of Crowheart.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
538 
WWUS45 KRIW 042351
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
551 PM MDT Tue Apr 4 2023

WYZ020-022-050100-
/O.EXP.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Natrona County Lower Elevations-Casper Mountain-
Including the city of Casper
551 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow and wind will continue to decrease this evening. Thus, the 
Blizzard Warning will expire at 6 PM.

$$

WYZ019-050100-
/O.EXP.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
Green Mountains and Rattlesnake Range-
Including the city of Jeffrey City
551 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow and wind will continue to decrease this evening. Thus, the 
Blizzard Warning will expire at 6 PM.

$$

WYZ030-050100-
/O.EXP.KRIW.BZ.W.0002.000000T0000Z-230405T0000Z/
East Sweetwater County-
Including the city of Wamsutter
551 PM MDT Tue Apr 4 2023

...BLIZZARD WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow and wind will continue to decrease this evening. Thus, the 
Blizzard Warning will expire at 6 PM.

$$

WYZ017-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Basin-
Including the cities of Riverton and Shoshoni
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ009>011-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Bighorn Mountains Southeast-Northeast Johnson County-
Southeast Johnson County-
Including the cities of Buffalo and Kaycee
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ015-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains East-
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ005-007-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Southwest Big Horn Basin-Owl Creek and Bridger Mountains-
Including the city of Thermopolis
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ018-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Lander Foothills-
Including the city of Lander
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ027-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ014-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Wind River Mountains West-
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ028-029-050100-
/O.EXP.KRIW.WS.W.0010.000000T0000Z-230405T0000Z/
Rock Springs and Green River-Flaming Gorge-
Including the cities of Rock Springs and Green River
551 PM MDT Tue Apr 4 2023

...WINTER STORM WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Storm Warning will expire at 6 PM.

$$

WYZ016-050100-
/O.EXP.KRIW.WW.Y.0025.000000T0000Z-230405T0000Z/
Upper Wind River Basin-
Including the city of Dubois
551 PM MDT Tue Apr 4 2023

...WINTER WEATHER ADVISORY WILL EXPIRE AT 6 PM MDT THIS EVENING...

Snow will continue to decrease this evening. Thus, the Winter
Weather Advisory will expire at 6 PM..

$$

For more information from the National Weather Service visit
https://weather.gov/riw

What forecasters said that day

The local office's own words before this blizzard warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Riverton, WY wrote its last area forecast discussion before this blizzard warning went out at Apr 3, 2:32 PM MDT, 11 minutes earlier.

Area forecast discussion, Apr 3, 2:32 PM MDT, 11 minutes before
Area Forecast Discussion
National Weather Service Riverton WY
232 PM MDT Mon Apr 3 2023

.DISCUSSION...(This evening through Monday)
Issued at 157 PM MDT Mon Apr 3 2023

Quoting the cast of White Christmas: "snow, Snow, SNOW, SNOOOW!".
Too bad it's almost Easter...

The broad midlevel trough continues to dive southeast into the
Great Basin, pumping ample moisture into the state. This is also
inducing sfc low pressure development in northern Colorado, which
is wrapping easterly flow back around underneath the moisture
plume. This has brought a well-defined area of snowfall across
central Wyoming today, with snowfall observations already
reaching 10 inches at Casper through noon today. The trough will
gradually shift east during the night tonight, right along the
WY/CO border. As the system slowly moves east, the isentropic lift
will continue, even increase across central Wyoming. Noting from
the morning sounding showed somewhat drier air near the sfc, and
observations from Casper noted a finer powdery snow, snow ratios
have been above 12 to 1. Putting these together, have pushed
snowfall totals higher mainly for Natrona and portions of Fremont
County. The other complicating factor is the increasing east winds
tonight. With the sfc low deepening tonight, forecast gradient has
tightened even further, so the wind forecast has been increased
for tonight and tomorrow morning. This has necessitated upgrading
the Winter Storm Warnings for Natrona and southeast Fremont
Counties up to a Blizzard Warning. Peak wind gusts of 50 to 60
mph are more likely from northern Natrona southwest toward Jeffrey
City. Strong winds will also extend well into Fremont and
Sweetwater, so travel conditions will deteriorate significantly
for both the I-25 and I-80 corridors tonight. As the sfc low moves
east into Nebraska, winds will shift more from the north Tuesday
morning. While this will gradually decrease the forcing needed for
snow production, gusty winds from another direction will continue
to exacerbate the near white-out conditions across central and
southern Wyoming through the morning hours. As the sfc low ejects
into the Northern Plains, snowfall will end quickly across the
state, with only light snow possible for the western mountains
into the day Wednesday.

The northerly flow will reinforce the abnormally cold temperatures
across the area, especially areas is fresh snowfall. The good news
is that models are still optimistic in building a ridge across
the Rockies behind this system, both deflecting the active pattern
into Canada, and allowing temperatures to moderate quickly late
week into the weekend. Temperatures mostly in the 40s and 50s will
be a refreshing change for the Easter weekend.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 1157 AM MDT Mon Apr 3 2023

A significant Winter Storm will continue to impact the region
through the TAF period. Prevailing IFR/LIFR conditions will continue
at most south central and central WY terminals including KCPR, KLND,
KRIW, and KRKS through the TAF period. These conditions are a result
of moderate to heavy snow and gusty winds with gusts of 30 to
40kts possible, which will lead to blowing snow and vsby may be
reduced to 1/4SM or less at times, particularly at KCPR and KRKS.

KCOD and KWRL terminals will see mainly VFR/MVFR through 03Z
this evening, when conditions will deteriorate to IFR as snow begins
to move into those terminals. A cold front will also bring gusty
north winds to KCOD and KWRL terminals around that same time with
gusts 30 to 35kts expected through the rest of the TAF period. These
winds will lead to blowing snow and could further reduce vsby to
LIFR at times, especially during the overnight period.

For west of the Divide Terminals, KBPI, KJAC, and KPNA, snow will be
more showery in nature and a prevailing period of IFR conditions is
not expected for any of the three terminals. However, brief periods
of IFR conditions could occur with periods of more intense snow
showers. This afternoon through 06Z tonight, is the most likely
timeframe for any IFR conditions to occur at these terminals.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for
the latest information on icing and turbulence forecasts.

&&

.FIRE WEATHER...
Issued at 157 PM MDT Mon Apr 3 2023

Near-blizzard conditions will be possible in zones 280/289/300
Monday night. Snow and winds will gradually subside by Tuesday
evening. Light snow may continue for the western mountains into
the day Wednesday, but accumulations will be minimal. Drier
conditions will trend toward the latter half of the week into next
weekend, with milder, almost normal temperatures returning.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
Winter Storm Warning until 6 PM MDT Tuesday for WYZ005-007-
009>011-014-015-017-018-024-026>030.

Winter Weather Advisory until 6 PM MDT Tuesday for WYZ016-023.

Blizzard Warning until 6 PM MDT Tuesday for WYZ019-020-022.

&&

DISCUSSION...Straub
AVIATION...Hensley
FIRE WEATHER...Straub
Hazardous weather outlook, Apr 3, 3:55 AM MDT, 10 hours 48 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
355 AM MDT Mon Apr 3 2023

WYZ001>020-022>030-041400-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
355 AM MDT Mon Apr 3 2023

...Multiple Winter Weather Highlights Remain in Effect...

This Hazardous Weather Outlook is for Western and Central
Wyoming.

.DAY ONE...Today and Tonight.

Snow increases across central and southern Wyoming today. Snow
rates increase this afternoon and into the overnight hours. Winds
will also increase today. White-out conditions likely at times
this afternoon and overnight. Please see the winter weather
highlights for additional details.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday...Snow and wind continues through the first half of the
day. Snow and wind decreases by evening. Unseasonably cold.

Wednesday and Thursday...High temperatures 15 to 25 degrees below
normal.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.

The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 3, 3:50 AM MDTWinter Weather AdvisoryRIWFremont, Lincoln38 hr

Nearby

Blizzard Warnings in Wyoming, 2023Every blizzard warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.