Alert archive / Wyoming / Winter Storm Warnings in 2021
Winter Storm Warning 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter storm warning at Jan 4, 2021, 1:09 PM MST for Albany County, Carbon County, Wyoming. It took effect at Jan 4, 2021, 11:00 PM MST. It was in force for 18 hr. 13 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 4, 2021, 1:09 PM MST (20:09 UTC)
- In effect from
- Jan 4, 2021, 11:00 PM MST
- Expired
- Jan 5, 2021, 5:00 PM 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 20:06 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 5, 5:00 PM MST | SNOW 6 | 14 Nne Skyline, WY | SOUTH BRUSH CREEK SNOTEL IN THE SNOWY RANGE. ELEVATION 8440 FEET. SNOW WATER EQUIVALENT IS 0.6 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 10 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 6 | 7 Wsw Centennial, WY | CINNABAR PARK SNOTEL IN THE SNOWY RANGE. ELEVATION 9574 FEET. SNOW WATER EQUIVALENT IS 0.5 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 12 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 7.5 | 7 Wnw Centennial, WY | BROOKLYN LAKE SNOTEL IN THE SNOWY RANGE. ELEVATION 10240 FEET. SNOW WATER EQUIVALENT IS 0.5 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 7.5 | 8 Sw Skyline, WY | BLACKHALL MOUNTAIN SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 9820 FEET. SNOW WATER EQUIVALENT IS 0.5 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 9 | 10 Ssw Arlington, WY | SAND LAKE SNOTEL IN THE SNOWY RANGE. ELEVATION 10050 FEET. SNOW WATER EQUIVALENT IS 0.6 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 9 | 14 E Dixon, WY | BATTLE MOUNTAIN SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 7440 FEET. SNOW WATER EQUIVALENT IS 0.9 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 10 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | SNOW 9.6 | 8 Wsw Encampment, WY | WEBBER SPRINGS SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 9250 FEET. SNOW WATER EQUIVALENT IS 0.8 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 12 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 13.2 | 12 Sw Encampment, WY | LITTLE SNAKE RIVER SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 8915 FEET. SNOW WATER EQUIVALENT IS 1.1 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 12 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 13.2 | 15 Ssw Encampment, WY | WHISKEY PARK SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 8950 FEET. SNOW WATER EQUIVALENT IS 1.1 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 12 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 15.6 | 20 Wnw Encampment, WY | DIVIDE PEAK SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 8880 FEET. SNOW WATER EQUIVALENT IS 1.3 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 12 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 16.5 | 14 Wnw Centennial, WY | MED BOW SNOTEL IN THE SNOWY RANGE. ELEVATION 10510 FEET. SNOW WATER EQUIVALENT IS 1.1 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 18 | 10 Wsw Encampment, WY | OLD BATTLE SNOTEL IN THE SIERRA MADRE RANGE. ELEVATION 10000 FEET. SNOW WATER EQUIVALENT IS 1.2 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
| Jan 5, 5:00 PM MST | HEAVY SNOW 19.5 | 14 W Centennial, WY | NORTH FRENCH CREEK SNOTEL IN THE SNOWY RANGE. ELEVATION 10130 FEET. SNOW WATER EQUIVALENT IS 1.3 INCHES AND THE SNOW TO LIQUID RATIO USED WAS 15 TO 1. ACCUMULATION WAS OVER PAST 18 HOURS. |
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, 8.2 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
- 2379 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
972 WWUS45 KCYS 042009 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 109 PM MST Mon Jan 4 2021 ...MODERATE TO HEAVY MOUNTAIN SNOW EXPECTED LATE TONIGHT THROUGH TUESDAY... WYZ112-114-051200- /O.UPG.KCYS.WW.Y.0001.210105T0600Z-210106T0000Z/ /O.NEW.KCYS.WS.W.0001.210105T0600Z-210106T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 109 PM MST Mon Jan 4 2021 ...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 16 inches. Winds gusting as high as 55 mph producing blowing snow and near zero visibilities at times. * WHERE...Snowy and Sierra Madre Ranges. * WHEN...11 PM this evening to 5 PM Tuesday. * IMPACTS...Dangerous mountain travel due to icy, snow packed roads and low visibilities in falling and blowing snow. Outdoor recreation could be life threatening to those caught unprepared for severe winter conditions. 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. && $$ Rubin
3 follow-up statements
805 WWUS45 KCYS 050254 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 754 PM MST Mon Jan 4 2021 ...MODERATE TO HEAVY MOUNTAIN SNOW EXPECTED LATE TONIGHT THROUGH TUESDAY... ...AREAS OF BLOWING SNOW AND REDUCED VISIBILITIES ALONG THE I-80 CORRIDOR ARLINGTON TO ELK MOUNTAIN BEGINNING AROUND SUNRISE THROUGH SUNDOWN TUESDAY... WYZ112-114-060000- /O.CON.KCYS.WS.W.0001.210105T0600Z-210106T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 754 PM MST Mon Jan 4 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 5 PM MST TUESDAY... * WHAT...Heavy snow expected. Total snow accumulations of 12 to 16 inches. Winds gusting as high as 55 mph producing blowing snow and near zero visibilities at times. * WHERE...Snowy and Sierra Madre Ranges. * WHEN...11 PM this evening to 5 PM Tuesday. * IMPACTS...Dangerous mountain travel due to icy, snow packed roads and low visibilities in falling and blowing snow. Outdoor recreation could be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ110-060000- /O.NEW.KCYS.WW.Y.0002.210105T1200Z-210106T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 754 PM MST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 AM TO 5 PM MST TUESDAY... * WHAT...Snow expected. Total snow accumulations of up to 3 inches. Winds gusting as high as 65 mph. * WHERE...Arlington and Elk Mountain along Interstate 80 between Laramie and Rawlins. * WHEN...From 5 AM to 5 PM MST Tuesday. * IMPACTS...Plan on slippery road conditions. Widespread blowing snow could significantly reduce visibility, even producing whiteout conditions at times. The hazardous conditions could impact the morning or evening commute. 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. && $$ AB
263 WWUS45 KCYS 051119 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 419 AM MST Tue Jan 5 2021 ...WINTER CONDITIONS IMPACTING AREAS WEST OF THE LARAMIE RANGE TODAY... WYZ112-114-060000- /O.CON.KCYS.WS.W.0001.000000T0000Z-210106T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 419 AM MST Tue Jan 5 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Heavy mountain snow expected. Total snow accumulations of 8 to 12 inches, with locally higher amounts possible. Winds gusting up to 55 MPH resulting in blowing snow and near blizzard conditions. * WHERE...Snowy and Sierra Madre mountain ranges. * WHEN...Until 5 PM MST today. * IMPACTS...Extremely dangerous or impossible mountain travel due to icy, snow packed roads and near zero visibilities in falling and blowing snow. Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ104-105-109-111-113-060000- /O.EXA.KCYS.WW.Y.0002.210105T1200Z-210106T0000Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-Southwest Carbon County- Upper North Platte River Basin- Including the cities of Seminoe Dam, Medicine Bow, Shirley Basin, Rawlins, Baggs, Saratoga, and Encampment 419 AM MST Tue Jan 5 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow showers and areas of blowing and drifting snow expected. Light accumulations. Winds gusting up to 45 MPH. * WHERE...Lower elevations of Carbon County. * WHEN...5 AM until 5 PM MST today. * IMPACTS...Hazardous travel due to slick, snow covered roads and reduced visibilities in falling and blowing snow. 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. && $$ WYZ110-060000- /O.CON.KCYS.WW.Y.0002.210105T1200Z-210106T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 419 AM MST Tue Jan 5 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow and blowing snow expected. Near zero visibilities possible at times. Total snow accumulations of up to 3 inches. Winds gusting as high as 65 MPH. * WHERE...Arlington and Elk Mountain along Interstate 80 between Laramie and Rawlins. * WHEN...5 AM until 5 PM MST today. * IMPACTS...Dangerous or impossible travel conditions due to slick or snow covered roads and significantly reduced visibilities in falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ CLH
272 WWUS45 KCYS 052055 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 155 PM MST Tue Jan 5 2021 ...IMPACTFUL WINTER WEATHER FOR AREAS WEST OF THE LARAMIE RANGE THIS AFTERNOON... WYZ112-114-060000- /O.CON.KCYS.WS.W.0001.000000T0000Z-210106T0000Z/ Sierra Madre Range-Snowy Range- Including the cities of Centennial and Albany 155 PM MST Tue Jan 5 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow. Additional snow accumulations of one to three inches. Total accumulations of 8 to 14 inches. Winds gusting as high as 55 mph. * WHERE...Sierra Madre and Snowy Mountain Ranges. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Extremely dangerous or impossible mountain travel due to icy, snow packed roads and near zero visibilities in falling and blowing snow. Outdoor recreation will be life threatening to those caught unprepared for severe winter conditions. 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. && $$ WYZ110-060000- /O.CON.KCYS.WW.Y.0002.000000T0000Z-210106T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 155 PM MST Tue Jan 5 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow. Additional snow accumulations of up to one inch. Total snow accumulations of 2 to 5 inches. Winds gusting as high as 60 mph. * WHERE...Arlington and Elk Mountain along Interstate 80 between Laramie and Rawlins. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Dangerous or impossible travel conditions due to slick snow covered roads and significantly reduced visibilities in falling and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ104-105-109-111-113-060000- /O.CON.KCYS.WW.Y.0002.000000T0000Z-210106T0000Z/ Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-Southwest Carbon County- Upper North Platte River Basin- Including the cities of Seminoe Dam, Medicine Bow, Shirley Basin, Rawlins, Baggs, Saratoga, and Encampment 155 PM MST Tue Jan 5 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON... * WHAT...Snow. Additional snow accumulations of up to one inch. Total snow accumulations of 2 to 5 inches. Winds gusting as high as 45 mph. * WHERE...Lower elevations of Carbon County. * WHEN...Until 5 PM MST this afternoon. * IMPACTS...Hazardous travel due to slick, snow covered roads and reduced visibilities in falling and blowing snow. 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 4, 12:53 AM MST | High Wind Warning | CYS | Albany, Carbon, Laramie, Platte | 12 hr |
| Jan 4, 3:16 AM MST | High Wind Watch | CYS | Albany, Carbon, Laramie, Platte | 16 hr |
| Jan 4, 3:43 AM MST | Winter Weather Advisory | CYS | Albany, Carbon | 9 hr |
| Jan 4, 1:13 PM MST | High Wind Warning | CYS | Albany, Carbon, Laramie, Platte | 30 hr |
Nearby
Winter Storm Warnings in Wyoming, 2021Every winter storm 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.