Winter Storm Warning 4, NWS Riverton, WY

Issued

Feb 20, 2021, 7:20 AM MST (14:20 UTC)

Expired

Feb 20, 2021, 6:00 PM MST

In force

11 hr

Issued by

NWS Riverton, WY

Counties Fremont County, WY, Lincoln County, WY, Sublette County, WY, Teton County, WY

The Riverton/Lander radar (KRIW), 120 km from the middle of the area, began a volume at 14:19 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.

322 
WWUS45 KRIW 201420
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
720 AM MST Sat Feb 20 2021

...Significant Snow over far Western Wyoming Today...

.Another storm system will bring significant snowfall across far
western Wyoming through the day today. Snow has spread across
southern portions and continue through the rest of the morning.
Gusty winds will develop this afternoon across the south, leading
to blowing and drifting snow.

WYZ013-023-210100-
/O.UPG.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
/O.NEW.KRIW.WS.W.0004.210220T1420Z-210221T0100Z/
Jackson Hole-Star Valley-
Including the cities of Jackson, Afton, Alpine, 
Star Valley Ranch, and Thayne
720 AM MST Sat Feb 20 2021

...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MST THIS EVENING...

* WHAT...Periods of snow, heavy at times. 

* WHERE...Jackson Hole and Star Valley. Additional snow
  accumulation of 3 to 6 inches in Jackson Hole and 2 to 4 inches
  in Star Valley.

* WHEN...Until 6 PM MST this evening. The heaviest snow will occur
  trough noon.

* IMPACTS...Plan on difficult travel with slick and snow packed 
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

WYZ012-210100-
/O.UPG.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
/O.NEW.KRIW.WS.W.0004.210220T1420Z-210221T0100Z/
Teton and Gros Ventre Mountains-
720 AM MST Sat Feb 20 2021

...WINTER STORM WARNING IN EFFECT UNTIL 6 PM MST THIS EVENING...

* WHAT...Periods of heavy snow. Additional snow accumulations of 4
  to 8 inches with isolated amounts of 10 inches.

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...Until 6 PM MST this evening. The heaviest snow will occur
  through noon. 

* IMPACTS...Expect very difficult travel. This will impact travel
  over Teton and Togwotee mountain passes.

* ADDITIONAL DETAILS...Skiers and snowmobilers can easily become
  disoriented and lost due to severely reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

WYZ027>030-210100-
/O.CON.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
South Lincoln County-Rock Springs and Green River-Flaming Gorge-
East Sweetwater County-
Including the cities of Kemmerer, Cokeville, Rock Springs, 
Green River, and Wamsutter
720 AM MST Sat Feb 20 2021

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

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

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

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

* IMPACTS...Expect winter driving conditions. This will impact 
  travel over Interstate 80 and US Highway 30. Reduced 
  visibilities will be possible in areas of heavier snowfall 
  this morning, as well as blowing snow this afternoon.

* ADDITIONAL DETAILS...The blowing snow will mainly occur this 
  afternoon after the bulk of the snow has ended.

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.

&&

$$

WYZ024-210100-
/O.CON.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
Salt River and Wyoming Ranges-
720 AM MST Sat Feb 20 2021

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

* WHAT...Periods of snow. Additional snow accumulations of up to 
  3 inches.

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 6 PM MST this evening. The heaviest snow will occur
  through noon.

* IMPACTS...Expect winter driving conditions. This will impact
  travel over Salt River mountain passes.

* ADDITIONAL DETAILS...Skiers and snowmobilers can easily become 
  disoriented and lost due to severely reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

Team Riverton/21

881 
WWUS45 KRIW 201940
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
1240 PM MST Sat Feb 20 2021

...Significant Snow continues over far Western Wyoming this
Afternoon...

.The snowfall across far western Wyoming will gradually decrease
in coverage and intensity by mid to late afternoon.

WYZ027>030-202045-
/O.CAN.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
South Lincoln County-Rock Springs and Green River-Flaming Gorge-
East Sweetwater County-
Including the cities of Kemmerer, Cokeville, Rock Springs, 
Green River, and Wamsutter
1240 PM MST Sat Feb 20 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Although there could be isolated snow showers, any additional
snowfall will be light. There will be patchy blowing snow, but
roads will be mainly wet as temperatures are near 30 degrees along
with some sunshine. Thus the winter weather advisory for
Sweetwater County and southern Lincoln County has been cancelled. 

$$

WYZ012-210100-
/O.CON.KRIW.WS.W.0004.000000T0000Z-210221T0100Z/
Teton and Gros Ventre Mountains-
1240 PM MST Sat Feb 20 2021

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

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

* WHERE...Teton and Gros Ventre Mountains.

* WHEN...Until 6 PM MST this evening. The snow will decrease in
  coverage and intensity by mid afternoon.

* IMPACTS...Expect very difficult travel. This will impact 
  travel over Teton and Togwotee mountain passes.

* ADDITIONAL DETAILS...Skiers and snowmobilers can easily become 
  disoriented and lost due to severely reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

WYZ013-023-210100-
/O.CON.KRIW.WS.W.0004.000000T0000Z-210221T0100Z/
Jackson Hole-Star Valley-
Including the cities of Jackson, Afton, Alpine, 
Star Valley Ranch, and Thayne
1240 PM MST Sat Feb 20 2021

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

* WHAT...Periods of snow. Additional snow accumulations of up to
  two inches. 

* WHERE...Jackson Hole and Star Valley. 

* WHEN...Until 6 PM MST this evening. The snow will decrease in
  coverage and intensity by mid afternoon.

* IMPACTS...Plan on difficult travel with slick and snow packed 
  roads.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

WYZ024-210100-
/O.CON.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
Salt River and Wyoming Ranges-
1240 PM MST Sat Feb 20 2021

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

* WHAT...Snow. Additional snow accumulations of up to two inches. 

* WHERE...Salt River and Wyoming Ranges.

* WHEN...Until 6 PM MST this evening. The snow will decrease in
  coverage and intensity by mid afternoon.

* IMPACTS...Expect winter driving conditions. This will impact 
  travel over Salt River mountain passes.

* ADDITIONAL DETAILS...Skiers and snowmobilers can easily become 
  disoriented and lost due to severely reduced visibility.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

Please monitor the Bridger-Teton Avalanche Center at
JHAVALANCHE.ORG, if your plans include travel into the back
country.

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

&&

$$

21

177 
WWUS45 KRIW 210047
WSWRIW

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
547 PM MST Sat Feb 20 2021


WYZ012-210200-
/O.EXP.KRIW.WS.W.0004.000000T0000Z-210221T0100Z/
Teton and Gros Ventre Mountains-
547 PM MST Sat Feb 20 2021

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

The steady snow has ended for the most part. Any leftover snow
showers will leave only light additional accumulations.

$$

WYZ013-023-210200-
/O.EXP.KRIW.WS.W.0004.000000T0000Z-210221T0100Z/
Jackson Hole-Star Valley-
Including the cities of Jackson, Afton, Alpine, 
Star Valley Ranch, and Thayne
547 PM MST Sat Feb 20 2021

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

The steady snow has ended for the most part. Any leftover snow
showers will leave only light additional accumulations.

$$

WYZ024-210200-
/O.EXP.KRIW.WW.Y.0013.000000T0000Z-210221T0100Z/
Salt River and Wyoming Ranges-
547 PM MST Sat Feb 20 2021

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

The steady snow has ended for the most part. Any leftover snow
showers will leave only light additional accumulations.

$$

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

Winter Storm Warnings in Wyoming, 2021Every winter storm warning in 2021

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