Alert archive / Wyoming / High Wind Warnings in 2022

High Wind Warning 1, NWS Riverton, WY

January 3, 20225 counties in Wyoming

NWS Riverton, WY issued this high wind warning at Jan 3, 2022, 3:01 PM MST for 5 counties in Wyoming. It took effect at Jan 3, 2022, 11:03 PM MST. It was in force for 15 hr. 3 reports 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
Jan 3, 2022, 3:01 PM MST (22:01 UTC)
In effect from
Jan 3, 2022, 11:03 PM MST
Expired
Jan 4, 2022, 1:42 PM MST
In force
15 hr
Issued by
NWS Riverton, WY

Counties Fremont County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Sweetwater County, WY

The radar

The Riverton/Lander radar (KRIW), 33 km from the middle of the area, began a volume at 22:03 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
Jan 4, 3:33 AM MSTNON-TSTM WND GST 581 Ssw Lander, WYASOS STATION KLND LANDER AIRPORT.
Jan 4, 3:35 AM MSTNON-TSTM WND GST 693 Nnw Buffalo, WYASOS STATION KBYG BUFFALO AIRPORT.
Jan 4, 8:05 AM MSTNON-TSTM WND GST 658 Se Reliance, WYASOS STATION KRKS ROCK SPRINGS AIRPORT.

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, 10.0 hours before the alert went out and 32 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 2022-01-03Temperature 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 2022-01-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939587897Sfc1 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
2169 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
230 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

792 
WWUS75 KRIW 032201
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
301 PM MST Mon Jan 3 2022

WYZ019-020-041400-
/O.UPG.KRIW.HW.A.0001.220104T0700Z-220104T2200Z/
/O.NEW.KRIW.HW.W.0001.220104T0900Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
301 PM MST Mon Jan 3 2022

...HIGH WIND WARNING IN EFFECT FROM 2 AM TO 5 PM MST TUESDAY...

* WHAT...West winds 30 to 40 mph with gusts up to 60 mph 
  expected.

* WHERE...Green Mountains and Rattlesnake Range and Natrona 
  County Lower Elevations.

* WHEN...From 2 AM to 5 PM MST Tuesday.

* IMPACTS...Travel will be difficult, especially for high profile
  vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. Use caution if you must drive.

&&

$$

WYZ027>030-041400-
/O.EXT.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
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
301 PM MST Mon Jan 3 2022

...HIGH WIND WATCH NOW IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
WEDNESDAY EVENING...

* WHAT...West and northwest winds 30 to 40 mph with gusts up to 
  65 mph possible. Periods of snow and blowing snow could also 
  lower visibility and make roads slick.

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

* WHEN...From late Tuesday night through Wednesday evening.

* IMPACTS...Travel could be hazardous, as the combination of wind
  and snow could greatly reduce visibility and increase the 
  blowover risk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds. Consider not traveling
during this timeframe.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
5 follow-up statements
474 
WWUS75 KRIW 040603
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
1103 PM MST Mon Jan 3 2022

WYZ027>030-041500-
/O.EXB.KRIW.HW.W.0001.220104T1000Z-220104T1900Z/
/O.CON.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
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
1103 PM MST Mon Jan 3 2022

...HIGH WIND WARNING IN EFFECT FROM 3 AM TO NOON MST TUESDAY...
...HIGH WIND WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT
THROUGH WEDNESDAY EVENING...

* WHAT...West wind 30 to 40 mph with gusts up to 65 mph.

* WHERE...South Lincoln County, and Sweetwater County.

* WHEN...High wind warning from 3 AM to noon Tuesday. High wind
  watch is in effect from late Tuesday night through Wednesday
  evening. There will be a lull in the high wind event Tuesday
  afternoon through late Tuesday night.

* IMPACTS...Mainly to transportation. Enhanced blowover
  risk for lightweight and high-profile vehicles, including
  campers and tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park 
into the wind to minimize the possibility of your car door 
hitting another parked vehicle.

&&

$$

WYZ010-041500-
/O.EXB.KRIW.HW.W.0001.220104T0603Z-220104T1500Z/
Northeast Johnson County-
Including the city of Buffalo
1103 PM MST Mon Jan 3 2022

...HIGH WIND WARNING IN EFFECT UNTIL 8 AM MST TUESDAY...

* WHAT...West winds 30 to 40 mph with gusts up to 65 mph.

* WHERE...Northeast Johnson County.

* WHEN...Until 8 AM Tuesday.

* IMPACTS...Mainly to transportation including along Interstate 
  25 and 90. Enhanced blowover risk for lightweight and high- 
  profile vehicles, including campers and tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park 
into the wind to minimize the possibility of your car door 
hitting another parked vehicle.

&&

$$

WYZ019-020-041500-
/O.CON.KRIW.HW.W.0001.220104T0900Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
1103 PM MST Mon Jan 3 2022

...HIGH WIND WARNING REMAINS IN EFFECT FROM 2 AM TO 5 PM MST
TUESDAY...

* WHAT...Southwest 30 to 40 mph with gusts up to 60 mph. Local
  wind gusts of 70 mph on the ridge tops over the Green and
  Rattlesnake ranges.

* WHERE...Green Mountains and Rattlesnake Range and Natrona County
  Lower Elevations including Casper area.

* WHEN...2 AM to 5 PM Tuesday.

* IMPACTS...Mainly to transportation including along Interstate 25
  and 90. Enhanced blowover risk for lightweight and high- 
  profile vehicles, including campers and tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park 
into the wind to minimize the possibility of your car door 
hitting another parked vehicle.

&&

$$

21
349 
WWUS75 KRIW 041026
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
326 AM MST Tue Jan 4 2022

WYZ027>030-050000-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220104T1900Z/
/O.CON.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
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
326 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON MST TODAY...
...HIGH WIND WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
WEDNESDAY EVENING...

* WHAT...West wind 30 to 40 mph with gusts up to 65 mph.

* WHERE...South Lincoln County, and Sweetwater County.

* WHEN...High wind warning through noon today. High wind watch is
  in effect from late tonight through Wednesday evening. There
  will be a lull in the high wind event this afternoon through
  late tonight.

* IMPACTS...Mainly to transportation. Enhanced blowover risk for
  lightweight and high-profile vehicles, including campers and
  tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park into the
wind to minimize the possibility of your car door hitting another
parked vehicle.

&&

$$

WYZ019-020-050000-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
326 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...Southwest 30 to 40 mph with gusts up to 60 mph. Local
  wind gusts of 70 mph along Outer Drive on the south side of
  Casper, and on ridges in the Green and Rattlesnake ranges.

* WHERE...Green Mountains and Rattlesnake Range and Natrona County
  Lower Elevations including Casper area. This also impacts Beaver
  Rim, and Jeffrey City along Highway 287, 789. 

* WHEN...Now through 5 PM Today.

* IMPACTS...Mainly to transportation including along Interstate 
  25 and 90. Enhanced blowover risk for lightweight and high- 
  profile vehicles, including campers and tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park into the
wind to minimize the possibility of your car door hitting another
parked vehicle.

&&

$$

WYZ010-041500-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220104T1500Z/
Northeast Johnson County-
Including the city of Buffalo
326 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 AM MST THIS
MORNING...

* WHAT...West winds 30 to 40 mph with gusts up to 65 mph.

* WHERE...Northeast Johnson County. The strongest wind gust at the
  Buffalo Airport has been 62 mph at 154 AM.

* WHEN...Until 8 AM this morning.

* IMPACTS...Mainly to transportation including along Interstates 
  25 and 90. Enhanced blowover risk for lightweight and high- 
  profile vehicles, including campers and tractor trailers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use caution if you must drive. In a parking lot, park into the
wind to minimize the possibility of your car door hitting another
parked vehicle.

&&

$$

Team Riverton/21
027 
WWUS75 KRIW 041454
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
754 AM MST Tue Jan 4 2022

WYZ010-041600-
/O.EXP.KRIW.HW.W.0001.000000T0000Z-220104T1500Z/
Northeast Johnson County-
Including the city of Buffalo
754 AM MST Tue Jan 4 2022

...HIGH WIND WARNING WILL EXPIRE AT 8 AM MST THIS MORNING...

Wind speeds have fallen below warning thresholds, but gusts of 30
to 40 mph will remain possible this morning. Therefore, the high 
wind warning will be allowed to expire..

$$

WYZ027>030-042300-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220104T1900Z/
/O.CON.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
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
754 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON MST TODAY...
...HIGH WIND WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
WEDNESDAY EVENING...

* WHAT...For the High Wind Warning, west winds 25 to 35 mph with 
  gusts up to 55 mph. For the High Wind Watch, west winds 30 to 
  40 mph with gusts up to 60 mph possible.

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

* WHEN...For the High Wind Warning, until noon MST today. For 
  the High Wind Watch, from late tonight through Wednesday 
  evening.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. If possible, remain in the lower levels of
your home during the windstorm, and avoid windows. Use caution if
you must drive.

&&

$$

WYZ019-020-042300-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
754 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...West winds 30 to 40 mph with gusts up to 60 mph.

* WHERE...Green Mountains and Rattlesnake Range and Natrona 
  County Lower Elevations.

* WHEN...Until 5 PM MST this afternoon.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. If possible, remain in the lower levels of
your home during the windstorm, and avoid windows. Use caution if
you must drive.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
117 
WWUS75 KRIW 041801
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
1101 AM MST Tue Jan 4 2022

WYZ027>030-050600-
/O.CAN.KRIW.HW.W.0001.000000T0000Z-220104T1900Z/
/O.CON.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
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
1101 AM MST Tue Jan 4 2022

...HIGH WIND WARNING IS CANCELLED...
...HIGH WIND WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH
WEDNESDAY EVENING...

* WHAT...Winds have fallen below High Wind thresholds for today,
  therefore the Warning has been cancelled. For late tonight
  through Wednesday, west winds 30 to 40 mph with gusts up to 60 
  mph are possible.

* WHERE...East Sweetwater County, South Lincoln County, Rock
  Springs and Green River and Flaming Gorge. This includes
  portions of I-80 in southern Wyoming.

* WHEN...High Wind Watch in effect from late tonight through
  Wednesday evening.

* IMPACTS...Travel could be difficult, especially for high 
  profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts and warnings for updates on this
situation. Fasten loose objects or shelter objects in a safe
location prior to the onset of winds.

&&

$$

WYZ019-020-050000-
/O.CON.KRIW.HW.W.0001.000000T0000Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
1101 AM MST Tue Jan 4 2022

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS
AFTERNOON...

* WHAT...West winds 30 to 40 mph with gusts up to 60 mph.

* WHERE...Green Mountains and Rattlesnake Range and Natrona 
  County Lower Elevations.

* WHEN...Until 5 PM MST this afternoon.

* IMPACTS...Travel will be difficult, especially for high profile
  vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. Use caution if you must drive.

&&

$$

For more information from the National Weather Service visit
https://weather.gov/riw
445 
WWUS75 KRIW 042042
NPWRIW

URGENT - WEATHER MESSAGE
National Weather Service Riverton WY
142 PM MST Tue Jan 4 2022

WYZ019-020-042145-
/O.CAN.KRIW.HW.W.0001.000000T0000Z-220105T0000Z/
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
142 PM MST Tue Jan 4 2022

...HIGH WIND WARNING IS CANCELLED...

Winds associated with today's cold front have moved through the 
region, and winds are now below high impact criteria. Winds will 
continue to decrease through the afternoon and evening hours.

$$

WYZ027-042145-
/O.CAN.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
South Lincoln County-
Including the cities of Kemmerer and Cokeville
142 PM MST Tue Jan 4 2022

...HIGH WIND WATCH IS CANCELLED...

Impactful strong winds are still expected Wednesday, but due to 
an increase in forecast snowfall amounts and intensity, this area
will be covered by winter weather highlights instead.

$$

WYZ028>030-051400-
/O.UPG.KRIW.HW.A.0001.220105T0900Z-220106T0300Z/
/O.NEW.KRIW.HW.W.0002.220105T0900Z-220106T0300Z/
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
Including the cities of Rock Springs, Green River, and Wamsutter
142 PM MST Tue Jan 4 2022

...HIGH WIND WARNING IN EFFECT FROM 2 AM TO 8 PM MST WEDNESDAY...

* WHAT...West and northwest winds 30 to 40 mph with gusts up to 
  65 mph possible. Periods of snow and blowing snow could also 
  lower visibility and make roads slick.

* WHERE...Rock Springs and Green River, Flaming Gorge and East
  Sweetwater County. This includes I-80 across portions of
  southern Wyoming.

* WHEN...From 2 AM to 8 PM MST Wednesday.

* IMPACTS...Travel could be hazardous, as the combination of wind
  and snow could greatly reduce visibility and increase the
  blowover risk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People should avoid being outside in forested areas and around
trees and branches. Use caution if you must drive.

&&

$$

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 high wind 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 high wind warning went out at Jan 3, 10:30 AM MST, 4 hours 31 minutes earlier.

Area forecast discussion, Jan 3, 10:30 AM MST, 4 hours 31 minutes before
Area Forecast Discussion
National Weather Service Riverton WY
1030 AM MST Mon Jan 3 2022

.SHORT TERM...Today through Wednesday night

There is a LOT to talk about today. So, this discussion may end up
being the great American weather novel. In addition, there will
be contrast between West and East of the Divide. So, we will split
the discussion that way.

West of the Divide...Today will be the quietest period of the short
term. Ridging will hold on for about 12 to 18 more hours and bring
dry conditions and near normal temperatures, although there will be
a bit more a breeze in the north than previous days. Then, after
being down for maintenance, the snow machine will likely switch on
again for the rest of the period. A pair of waves will be the
weather makers. The first one looks like the appetizer. This system
has plenty of jet support, with the area in the left front quadrant
of an 150 knot jet streak. The limiting factor will be that it is a
fast mover so it will not be able to pile up snow over a long
period. The advisory may be a bit quick on the draw, but we will
leave it as is. The heaviest snow will fall after midnight through
the morning. The real epicenter would be between 3 and 9 am, when
the best jet dynamics and trough axis should maximize left. There
could be some heavy snowfall rates though, over an inch an hour at
times during the time frame.The region gets into the unfavorable
side of the jet after noon and snow should become lighter for around
12 hours or so.

The southern portions of the area will then be in the right front
quadrant of the jet, the downward forcing portion. This will make
things favorable for strong to high wind. Most models show 700
millibar winds climbing to 50 knots or over Tuesday with both the
NAM and GFS having sustained high wind at Rock Springs. As a result,
we have hoisted a high wind watch across Sweetwater and southern
Lincoln county starting Tuesday morning and continuing through
Wednesday. There will be a lull in the winds Tuesday night after
trough passage and the winds decouple for a time.

The second system then moves in for late Tuesday night into
Wednesday. This system looks to have more moisture to work with and
will be longer lasting. As a result, amounts look higher. There will
also be wind with it, so more highlights will likely be needed. With
the higher amounts, I could see the potential for warnings. Like the
previous system, this one will be heavily jet driven, with another
140 knot jet max moving into the area. The models are in fairly good
agreement with the best forcing during Wednesday morning, then the
best dynamics and trough axis move through. Again, there could be
some rather heavy snowfall rates during this time, possibly over an
inch an hour at times. The snow from this one should taper off
around sundown Wednesday, with another short break for Wednesday
night. Now for the windy side of the system.

After a lull, high winds will likely come back across the south on
Wednesday as the second system moves through. Ingredients are the
same, with 700 millibar winds approaching 60 knots and downward
forcing from the right front quadrant of the jet. The NAM has 45
knots sustained at Rock Springs on Wednesday, although this guidance
does tend to be a bit overcooked this far out. It does look like a
good bet for high wind though. It could even see watches a bit
further north toward the Green River Basin but not enough confidence
to include at this time. Wind should then begin to decrease
Wednesday night as the trough moves away, but may stay gusty much of
the night.

East of the Divide...The main concern for the first part of the
period here is wind. We have some borderline high winds this
morning, but this is only along Wyoming Boulevard and no where else
right now. Mid level winds do decrease somewhat today, so the wind
should subside somewhat. So, we will not issue any warnings for
today at this time. Things change tonight as the system that was
mentioned in the novel I wrote above approaches the area. This will
tighten the pressure gradient across the area. With 700 millibar
winds again approaching 50 to 55 knots across more of the area, we
have hoisted a high wind watch for the wind prone areas in the Green
Mountains and Natrona County starting tonight and continuing into
Tuesday afternoon. This is when an Arctic Front should shut off the
wind. More on that below.

The first Pacific system will then begin to cross the Divide early
Tuesday morning. As for snow from the first system, there could be
some across mainly the north as it moves in. Most of the area is on
the wrong side of the jet though, so we kept POPs and QPF low for
the time being. The best chance of some accumulation would be in
Johnson County where some moisture may over run an advancing back
door Arctic Boundary on Tuesday afternoon. Combined with gusty
winds, things could get nasty here for a time. But even here,
confidence is low. The snow is likely to be banded and very hard to
pinpoint a few hours out, let along more than 24 hours.

And speaking of the Arctic front, it will slowly slide through the
area, setting up near the Continental Divide by Wednesday. This will
make temperature forecasting a nightmare. A place like Buffalo,
which will see it first, may end up with falling temperatures on
Tuesday, ending up in the single digits by sunset. Meanwhile, a
place like Riverton, with a gusty wind ahead of it, may rise into
the 40s ahead of the front. So confidence is low here.

And the final chapter will be when the second and more potent
system crosses the Divide on Wednesday. This will bring a much
better chance of snow to many areas. However, there is still much
uncertainty with the details. This will be jet driven, not like our
usual upslope situation. And these snows are the banded variety. And
as a result, very hard to nail down exactly where, especially more
than 48 hours out. Most areas should have a decent chance of some
though, so we went with likely POPs for most locations. At this
time, the best guess would be from around Cody southeastward through
Casper. But, there is still a fair amount of model disagreement
since it all depends on the jet position and a 50 mile change can
make a big difference. It could get nasty though with a dry, powdery
snow and gusty winds blowing it around though. Quieter weather
should move in for a brief period Wednesday night as the system
moves away.

.LONG TERM...Thursday through Sunday

After a couple of bouts of significant snow mainly over the west in
the short-term, there looks to be a good chance of another round of
significant snow across the west in the Thursday and Thursday
night time frame.

A moist, westerly isentropic upglide, upper level jet dynamics, and
weak disturbances in the flow could result in significant snow over
the west Thursday into Thursday night. Some snow could spill east
of the Divide, but only minor snow accumulations are expected.
Strong to possibly high wind could occur in typical spots from
eastern Sweetwater County northeast to Natrona County, as well as
the Absaroka Mountains. The Arctic air mass is expected to begin
retreating away from the area Thursday into Friday. Medium range
models tend to be too fast on warming temperatures especially in
trapped basins/valleys where a very strong surface inversion
should be in place. Have cooled temperatures in basins/valleys
Thursday and Friday, but kept a warm up in typical wind prone
areas.

A moist westerly flow will keep good chances of snow over the far
west/northwest Friday, before a trough pulls across the area
Friday night and Saturday. As this occurs light to moderate
snowfall is expected with the greatest impact over the west. This
snowfall will also be aided by right-rear dynamics from a strong
upper jet. In wake of this trough, models currently show a dry
conditions late Saturday night and Sunday.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday morning)
Issued at 1030 AM Mon Jan 3 2022

East of the Divide...KCOD/KCPR/KLND/KRIW/KWRL Terminals

VFR conditions will occur through the period with increasing mid to
high-level cloudiness. The main issue will be windy west to
southwest flow on the lee side of mountain ranges, and from South
Pass to Natrona County including KCPR. Breezy winds are also
expected at times at KCOD. If winds are not westerly or become
light, there will be strong westerly low-level wind shear at KCOD
especially tonight.

West of the Divide...KBPI/KJAC/KPNA/KRKS Terminals

VFR conditions are expected through at least 00Z with an
increasing mid to high-level cloud. Snow is expected to begin
developing over the far west between 03Z and 06Z Tuesday with
lowering ceilings especially at KJAC. MVFR ceilings and IFR
visibility in snow are expected to develop over the far west
(including KJAC) between 04Z and 08Z Tuesday. Once these
conditions develop they are expected to remain in place for the
rest of the TAF period. Farther southeast into the Upper Green
River Basin, some snow showers are expected, but confidence is
only high enough to insert some VCSH at KBPI and KPNA. KRKS will
remain dry with mainly light winds through the period.

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

&&

.FIRE WEATHER...

High pressure will bring one more dry day today. A gusty, to at
times, strong wind will continue from the Red Desert through Casper
and in the lee of the Absarokas. Relative humidity should remain
above critical levels. Mixing and smoke dispersal will be generally
poor. A weather system will bring snow to the west late tonight into
Tuesday morning. High winds are likely across southern Wyoming and
Natrona County on Tuesday.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
High Wind Watch from late tonight through Wednesday evening for
WYZ027>030.

High Wind Watch from late tonight through Tuesday afternoon for
WYZ019-020.

Winter Weather Advisory from 8 PM this evening to 11 AM MST
Tuesday for WYZ001-012>014-023>025.

&&

SHORT TERM...Hattings
LONG TERM...Murrell
AVIATION...Murrell
FIRE WEATHER...Hattings
Hazardous weather outlook, Jan 3, 3:56 AM MST, 11 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Riverton WY
356 AM MST Mon Jan 3 2022

WYZ001>020-022>030-041300-
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-
356 AM MST Mon Jan 3 2022

...Winter Weather Advisory In Effect for the far west from
tonight through Tuesday morning...

...High Wind Watch for the Green Mountains and Natrona County from
late tonight through Tuesday...

...High Wind Watch for Sweetwater and southern Lincoln Counties
from Tuesday morning through Wednesday evening...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Strong winds are likely from the Red Desert through Casper and in
the Lee of the Absarokas.

Snow returning to the western mountains tonight. The heaviest
snow is expected after 2 am.

High winds are possible from the Green Mountains through Natrona
County tonight. Please see High Wind Watch for details.

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

Tuesday...Snow continuing over the far west, tapering off in the
afternoon. A chance of light snow in northern Wyoming Tuesday.
Strong winds possible in Johnson County.

Strong to potentially high winds in southern Wyoming and Natrona
County. Please see High Wind Watch for details.

Tuesday Night into Wednesday...Significant snow possible over the
west with accumulating snow potential east of the Divide
Wednesday. High winds possible across Sweetwater and southern
Lincoln Counties.

Thursday and Friday...Significant snow is probable at times over
the west especially Thursday into Thursday evening based on
current data.

Saturday...Chances of snow continue mainly over the west.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

TEAM RIVERTON

In the hours before

Special weather statement, Jan 3, 2:23 PM MST, 38 minutes before
Special Weather Statement
National Weather Service Riverton WY
223 PM MST Mon Jan 3 2022

WYZ003-040900-
Cody Foothills-
Including the cities of Clark, Cody, and Meeteetse
223 PM MST Mon Jan 3 2022

...Strong Winds Today and Tonight...

This is a special weather statement from the National Weather
Service Office in Riverton.

* WHAT...West winds 20 to 30 mph with gusts to 40 to 50 mph.
  Occasional gusts to 60 mph are possible in the vicinity of
  Clark.

* WHERE...Cody Foothills, especially in the vicinity of Clark.

* WHEN...Through Tonight.

* ADDITIONAL DETAILS...Be prepared for sudden wind gusts on area
  roads. Lightweight and high profile vehicles will be at risk to
  blow over.

WYZ019-020-040900-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-
Including the cities of Jeffrey City and Casper
223 PM MST Mon Jan 3 2022

...Strong Winds Today and Tonight...

This is a special weather statement from the National Weather
Service Office in Riverton.

* WHAT...West winds 25 to 35 mph with gusts to 45 to 55 mph. Gusts
  of 60 to 65 mph will be possible across higher peaks in the
  mountains and along Outer Drive (Wyoming Boulevard) on the
  south side of Casper.

* WHERE...Green Mountain and Rattlesnake Ranges and lower
  elevations of Natrona County, particularly the Beaver Rim to
  Casper corridor.

* WHEN...Through Tonight.

* ADDITIONAL DETAILS...Be prepared for sudden wind gusts on area
  roads. Lightweight and high profile vehicles will be at risk to
  blow over.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 3, 3:05 AM MSTHigh Wind WatchRIWFremont, Lincoln, Natrona, Sweetwater35 hr
Jan 3, 3:17 PM MSTWinter Storm WatchRIWFremont, Lincoln, Sublette, Teton23 hr

Nearby

High Wind Warnings in Wyoming, 2022Every high wind warning in 2022

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.