Alert archive / Wyoming / Blizzard Warnings in 2021
Blizzard Warning 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this blizzard warning at Jan 17, 2021, 9:32 AM MST for Albany County, Carbon County, Wyoming. It took effect at Jan 17, 2021, 2:00 PM MST. It was in force for 18 hr. 5 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 17, 2021, 9:32 AM MST (16:32 UTC)
- In effect from
- Jan 17, 2021, 2:00 PM MST
- Expired
- Jan 18, 2021, 8:06 AM MST
- In force
- 18 hr
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Carbon County, WY
The radar
The Cheyenne radar (KCYS), 140 km from the middle of the area, began a volume at 16:30 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jan 18, 5:26 AM MST | SNOW 7.2 | 14.5 Ssw Arlington, WY | SAND LAKE SNOTEL. |
| Jan 18, 5:36 AM MST | SNOW 10.5 | 12 Wnw Centennial, WY | MEDICINE BOW SNOTEL. 0.7 INCH SWE. |
| Jan 18, 5:44 AM MST | SNOW 10.8 | 12.5 W Centennial, WY | NORTH FRENCH CREEK SNOTEL. 0.9 INCHES SWE. |
| Jan 18, 5:51 AM MST | SNOW 4 | 15 Ssw Encampment, WY | WHISKEY PARK SNOTEL. |
| Jan 18, 6:52 AM MST | SNOW 1.9 | 9.6 Wsw Rock River, 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, 4.5 hours before the alert went out and 230 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1904 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 377 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
020 WWUS45 KCYS 171632 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY Issued by National Weather Service Riverton WY 932 AM MST Sun Jan 17 2021 ...SNOWFALL AND BLOWING SNOW IMPACTS THIS AFTERNOON THROUGH MONDAY... .Period of highest concern is this evening through Monday morning when heavier snow showers will combine with strong winds for blowing snow impacts including slick road conditions and near whiteout conditions. WYZ110-181215- /O.UPG.KCYS.WW.Y.0003.210117T1800Z-210119T0000Z/ /O.NEW.KCYS.BZ.W.0001.210117T2100Z-210119T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 932 AM MST Sun Jan 17 2021 ...BLIZZARD WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 5 PM MST MONDAY... * WHAT...Blizzard conditions expected. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 60 mph. * WHERE...Arlington and Elk Mountain along I-80 between Laramie and Rawlins * WHEN...From 2 PM this afternoon to 5 PM MST Monday. * IMPACTS...Dangerous travel conditions. Blowing snow will cause whiteout conditions. Treacherous road conditions will occur. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. 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. && $$ WYZ112-114-181215- /O.CON.KCYS.WW.Y.0003.210117T1800Z-210119T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 932 AM MST Sun Jan 17 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Snow and blowing snow expected. Total snow accumulations of 6 to 8 inches across the Sierra Madres and Snowy Mountain Ranges. Winds will gust as high as 50 mph, especially this evening through Monday morning. This is also the window of opportunity for snow squalls to develop. Winds decrease Monday afternoon with gusts to 30 mph. * WHERE...Snowy and Sierra Madre Mountain Ranges. * WHEN...From 11 AM Today to 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Patchy blowing snow could significantly reduce visibility, becoming near whiteout at times. Slick road conditions are also anticipated. The hazardous conditions will impact travel. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WFO RIW/21
3 follow-up statements
295 WWUS45 KCYS 172100 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY Issued by National Weather Service Riverton WY 200 PM MST Sun Jan 17 2021 ...SNOWFALL AND BLOWING SNOW IMPACTS THIS AFTERNOON THROUGH MONDAY... .Significant snow and blowing snow will impact the Sierra Madre Range, Snowy Range, and the northern Snowy Range Foothills. The greatest concern will be from this evening through Monday morning. Whiteout conditions are expected at times. WYZ110-181300- /O.CON.KCYS.BZ.W.0001.000000T0000Z-210119T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 200 PM MST Sun Jan 17 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Blizzard conditions with whiteout conditions expected at times. Total snow accumulations of 2 to 4 inches. Winds gusting as high as 60 mph. * WHERE...Arlington and Elk Mountain along I-80 between Laramie and Rawlins. * WHEN...Now until 5 PM MST Monday. * IMPACTS...Dangerous travel conditions. Blowing snow will cause whiteout conditions. Treacherous road conditions will occur. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. 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. && $$ WYZ112-114-181300- /O.CON.KCYS.WW.Y.0003.000000T0000Z-210119T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 200 PM MST Sun Jan 17 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST MONDAY... * WHAT...Snow and blowing snow expected. Total snow accumulations of 5 to 8 inches across the Sierra Madres and Snowy Mountain Ranges. Winds will gust as high as 50 mph, especially this evening through Monday morning. This is also the window of opportunity for snow squalls to develop. Winds decrease Monday afternoon with gusts to 30 mph. * WHERE...Snowy and Sierra Madre Mountain Ranges. * WHEN...Now until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Areas of blowing snow could significantly reduce visibility, becoming near whiteout at times. Slick road conditions are also anticipated. The hazardous conditions will impact travel. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WFO RIW/21
066 WWUS45 KCYS 181019 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY Issued by National Weather Service Riverton WY 319 AM MST Mon Jan 18 2021 ...SNOWFALL AND BLOWING SNOW IMPACTS THROUGH THIS AFTERNOON... .Significant snow and blowing snow will impact the Sierra Madre Range, Snowy Range, and the northern Snowy Range Foothills. The greatest concern will be through this morning. Whiteout conditions are expected at times. WYZ110-190000- /O.CON.KCYS.BZ.W.0001.000000T0000Z-210119T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 319 AM MST Mon Jan 18 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Blizzard conditions with whiteout conditions expected at times. Additional accumulations of 1 to 2 inches expected. Winds gusting as high as 60 mph. Winds will decrease this afternoon, gusting to 35 mph. * WHERE...Arlington and Elk Mountain along I-80 between Laramie and Rawlins. * WHEN...Now until 5 PM MST Monday. * IMPACTS...Dangerous travel conditions. Blowing snow will cause whiteout conditions. Treacherous road conditions will occur. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. 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. && $$ WYZ112-114-190000- /O.CON.KCYS.WW.Y.0003.000000T0000Z-210119T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 319 AM MST Mon Jan 18 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow and blowing snow expected. Additional accumulations of 2 to 3 inches across the Sierra Madres and Snowy Mountain Ranges. Winds will gust as high as 50 mph, especially this evening through this morning. This is also the window of opportunity for snow squalls to develop. Winds decrease this afternoon with gusts to 30 mph. * WHERE...Snowy and Sierra Madre Mountain Ranges. * WHEN...Now until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Areas of blowing snow could significantly reduce visibility, becoming near whiteout at times. Slick road conditions are also anticipated. The hazardous conditions will impact travel. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
154 WWUS45 KCYS 181506 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY Issued by National Weather Service Riverton WY 806 AM MST Mon Jan 18 2021 ...SNOWFALL AND BLOWING SNOW IMPACTS THROUGH THIS AFTERNOON... .Snow and blowing snow will continue to impact the Sierra Madre Range, Snowy Range, and the northern Snowy Range Foothills. The greatest concern will be through this morning. Whiteout conditions are expected at times creating hazardous travel. WYZ110-182300- /O.CAN.KCYS.BZ.W.0001.000000T0000Z-210119T0000Z/ /O.EXA.KCYS.WW.Y.0003.000000T0000Z-210119T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 806 AM MST Mon Jan 18 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... ...BLIZZARD WARNING IS CANCELLED... * WHAT...Light snow, patchy blowing snow, areas of fog and slick road conditions. Additional snow accumulations up to one inch. * WHERE...Arlington and Elk Mountain along I-80 between Laramie and Rawlins. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Travel could be very difficult. Areas of blowing snow could significantly reduce visibility, becoming near whiteout at times. Slick road conditions are also anticipated. The hazardous conditions will impact travel. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel only if necessary. 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. && $$ WYZ112-114-182300- /O.CON.KCYS.WW.Y.0003.000000T0000Z-210119T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 806 AM MST Mon Jan 18 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow and blowing snow expected. Additional accumulations of 1 to 2 inches across the Sierra Madres and Snowy Mountain ranges. Winds will decrease, but gusts around 30 mph are still likely. * WHERE...Snowy and Sierra Madre Mountain Ranges. * WHEN...Now until 5 PM MST Monday. * IMPACTS...Travel could be very difficult. Areas of blowing snow could significantly reduce visibility. Slick road conditions are also anticipated. The hazardous conditions will impact travel. * ADDITIONAL DETAILS...Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 17, 9:39 AM MST | High Wind Warning | CYS | Albany, Carbon, Laramie | 19 hr |
Nearby
Blizzard Warnings in Wyoming, 2021Every blizzard warning in 2021
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.