Alert archive / Wyoming / Winter Storm Warnings in 2021
Winter Storm Warning 12, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter storm warning at Apr 18, 2021, 6:34 PM MDT for Albany County, Laramie County, Wyoming. It took effect at Apr 19, 2021, 9:00 AM MDT. It was in force for 17 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 18, 2021, 6:34 PM MDT (00:34 UTC)
- In effect from
- Apr 19, 2021, 9:00 AM MDT
- Expired
- Apr 20, 2021, 2:10 AM MDT
- In force
- 17 hr
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 50 km from the middle of the area, began a volume at 00:31 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 |
|---|---|---|---|
| Apr 19, 9:51 PM MDT | SNOW 3 | Buford, WY | REPORT RECEIVED FROM WYDOT TMC. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 0.6 hours before the alert went out and 245 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
- 12 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 2439 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
335 WWUS45 KCYS 190034 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 634 PM MDT Sun Apr 18 2021 ...STRONG COLD FRONT WILL BRING MUCH COLDER TEMPERATURES AND ACCUMULATING SNOW LATE TONIGHT THROUGH LATE MONDAY... WYZ116-191200- /O.UPG.KCYS.WS.A.0006.210419T1500Z-210420T0900Z/ /O.NEW.KCYS.WS.W.0012.210419T1500Z-210420T0900Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 634 PM MDT Sun Apr 18 2021 ...WINTER STORM WARNING IN EFFECT FROM 9 AM MONDAY TO 3 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 8 inches. Winds gusting as high as 40 mph. * WHERE...South Laramie Range including the Interstate 80 Summit and Vedauwoo. * WHEN...From 9 AM Monday to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult with snow covered roads. Blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute along Interstate 80 between Cheyenne and Laramie. * ADDITIONAL DETAILS...Heaviest snowfall expected Monday afternoon and early evening with snowfall rates near 1 inch per hour along the higher elevations. 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. && $$ NEZ002-095-WYZ101-102-191200- /O.CON.KCYS.WW.Y.0029.210419T0500Z-210420T0000Z/ Dawes County-Northern Sioux County- Converse County Lower Elevations-Niobrara County- Including the cities of Chadron, Chadron St Park, Harrison, Douglas, Glenrock, Bill, Deer Creek, Lusk, and Redbird 634 PM MDT Sun Apr 18 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 6 PM MDT MONDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 5 inches, with locally higher amounts possible along the Pine Ridge. * WHERE...East Central Wyoming and the Northern Nebraska Panhandle, including Douglas, Lusk, and Chadron. * WHEN...From 11 PM this evening to 6 PM MDT Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday morning and evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ103-191200- /O.CON.KCYS.WW.Y.0029.210419T0900Z-210420T0500Z/ North Laramie Range- Including the cities of Garrett and Esterbrook 634 PM MDT Sun Apr 18 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 3 AM TO 11 PM MDT MONDAY... * WHAT...Snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 35 mph. * WHERE...North Laramie Range. * WHEN...From 3 AM to 11 PM MDT Monday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. 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. && $$ NEZ020-054-WYZ105>108-110-114-115-117>119-191200- /O.CON.KCYS.WW.Y.0029.210419T1500Z-210420T0500Z/ Banner County-Kimball County-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-North Snowy Range Foothills- Snowy Range-Laramie Valley-South Laramie Range Foothills- Central Laramie County-East Laramie County- Including the cities of Harrisburg, Kimball, Medicine Bow, Shirley Basin, Bordeaux, Wheatland, Guernsey, Torrington, Arlington, Elk Mountain, Centennial, Albany, Laramie, Bosler, Whitaker, Federal, Horse Creek, Cheyenne, and Pine Bluffs 634 PM MDT Sun Apr 18 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM TO 11 PM MDT MONDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches, with 6 to 8 inches for the Snowy Range. Winds gusting as high as 35 mph. * WHERE...Southeast Wyoming and portions of South Central Wyoming including Arlington, Cheyenne, Kimball, Laramie, Pine Bluffs, and Torrington. * WHEN...From 9 AM to 11 PM MDT Monday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Brothers
4 follow-up statements
487 WWUS45 KCYS 190841 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 241 AM MDT Mon Apr 19 2021 ...STRONG COLD FRONT WILL BRING MUCH COLDER TEMPERATURES AND ACCUMULATING SNOW THROUGH THIS EVENING... WYZ116-192300- /O.CON.KCYS.WS.W.0012.210419T1500Z-210420T0900Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 241 AM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 9 AM THIS MORNING TO 3 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 8 inches. Winds gusting as high as 40 mph will created areas of drifting snow. * WHERE...South Laramie Range including the Interstate 80 Summit and Vedauwoo. * WHEN...From 9 AM Monday to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult with snow covered roads. Blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute along Interstate 80 between Cheyenne and Laramie. PRECAUTIONARY/PREPAREDNESS ACTIONS... The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NEZ002-095-WYZ101-102-192300- /O.CON.KCYS.WW.Y.0029.000000T0000Z-210420T0000Z/ Dawes County-Northern Sioux County- Converse County Lower Elevations-Niobrara County- Including the cities of Chadron, Chadron St Park, Harrison, Douglas, Glenrock, Bill, Deer Creek, Lusk, and Redbird 241 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 3 to 5 inches, with locally higher amounts possible along the Pine Ridge. * WHERE...East Central Wyoming and the Northern Nebraska Panhandle, including Douglas, Lusk, and Chadron. * WHEN...From 11 PM this evening to 6 PM MDT Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday morning and evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ WYZ103-192300- /O.CON.KCYS.WW.Y.0029.210419T0900Z-210420T0500Z/ North Laramie Range- Including the cities of Garrett and Esterbrook 241 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 35 mph. * WHERE...Northern Laramie Range. * WHEN...Until 11 PM MDT Monday. * IMPACTS...Travel could be very difficult. Blowing snow could significantly reduce visibility. 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. && $$ NEZ020-054-WYZ105>108-110-114-115-117>119-192300- /O.CON.KCYS.WW.Y.0029.210419T1500Z-210420T0500Z/ Banner County-Kimball County-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-North Snowy Range Foothills- Snowy Range-Laramie Valley-South Laramie Range Foothills- Central Laramie County-East Laramie County- Including the cities of Harrisburg, Kimball, Medicine Bow, Shirley Basin, Bordeaux, Wheatland, Guernsey, Torrington, Arlington, Elk Mountain, Centennial, Albany, Laramie, Bosler, Whitaker, Federal, Horse Creek, Cheyenne, and Pine Bluffs 241 AM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 AM THIS MORNING TO 11 PM MDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches, with 6 to 10 inches for the Snowy Range. Winds gusting as high as 35 mph. * WHERE...Southeast Wyoming and portions of South Central Wyoming including Arlington, Cheyenne, Kimball, Laramie, Pine Bluffs, and Torrington. * WHEN...From 9 AM to 11 PM MDT Monday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
783 WWUS45 KCYS 200228 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 828 PM MDT Mon Apr 19 2021 ...STRONG COLD FRONT WILL BRING MUCH COLDER TEMPERATURES AND ACCUMULATING SNOW THROUGH THIS EVENING... WYZ103-105>108-200330- /O.CAN.KCYS.WW.Y.0029.000000T0000Z-210420T0500Z/ North Laramie Range-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County- Including the cities of Garrett, Esterbrook, Medicine Bow, Shirley Basin, Bordeaux, Wheatland, Guernsey, and Torrington 828 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Snow is beginning to taper off north to south across southeast Wyoming and W Nebraska. $$ WYZ116-200900- /O.CON.KCYS.WS.W.0012.000000T0000Z-210420T0900Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 828 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 8 inches. Winds gusting as high as 40 mph will created areas of drifting snow. * WHERE...South Laramie Range including the Interstate 80 Summit and Vedauwoo. * WHEN...From 9 AM Monday to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult with snow covered roads. Blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute along Interstate 80 between Cheyenne and Laramie. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NEZ020-054-WYZ117>119-200700- /O.EXT.KCYS.WW.Y.0029.000000T0000Z-210420T0700Z/ Banner County-Kimball County-South Laramie Range Foothills- Central Laramie County-East Laramie County- Including the cities of Harrisburg, Kimball, Whitaker, Federal, Horse Creek, Cheyenne, and Pine Bluffs 828 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches, with 6 to 10 inches for the Snowy Range. Winds gusting as high as 35 mph. * WHERE...Southeast Wyoming and portions of South Central Wyoming including Cheyenne, Kimball, Pine Bluffs, Harrisburg, Whitaker, and Federal. * WHEN...Until 1 AM MDT Tuesday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday 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. && $$ WYZ110-114-115-200500- /O.CON.KCYS.WW.Y.0029.000000T0000Z-210420T0500Z/ North Snowy Range Foothills-Snowy Range-Laramie Valley- Including the cities of Arlington, Elk Mountain, Centennial, Albany, Laramie, and Bosler 828 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches, with 6 to 10 inches for the Snowy Range. Winds gusting as high as 35 mph. * WHERE...Southeast Wyoming and portions of South Central Wyoming including Arlington, Laramie, and Centennial. * WHEN...From 9 AM to 11 PM MDT Monday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
780 WWUS45 KCYS 200446 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 1046 PM MDT Mon Apr 19 2021 ...STRONG COLD FRONT WILL BRING MUCH COLDER TEMPERATURES AND ACCUMULATING SNOW THROUGH THIS EVENING... WYZ110-114-115-200600- /O.EXP.KCYS.WW.Y.0029.000000T0000Z-210420T0500Z/ North Snowy Range Foothills-Snowy Range-Laramie Valley- Including the cities of Arlington, Elk Mountain, Centennial, Albany, Laramie, and Bosler 1046 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 11 PM MDT THIS EVENING... Snow has continued to taper off north to south. A few light snow showers through the next few hours are not out of the question. $$ WYZ116-200900- /O.CON.KCYS.WS.W.0012.000000T0000Z-210420T0900Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 1046 PM MDT Mon Apr 19 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM MDT TUESDAY... * WHAT...Heavy snow and blowing snow expected. Total snow accumulations of 5 to 8 inches. Winds gusting as high as 40 mph will created areas of drifting snow. * WHERE...South Laramie Range including the Interstate 80 Summit and Vedauwoo. * WHEN...From 9 AM Monday to 3 AM MDT Tuesday. * IMPACTS...Travel could be very difficult with snow covered roads. Blowing snow could significantly reduce visibility. The hazardous conditions could impact the Tuesday morning commute between Cheyenne and Laramie. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NEZ020-054-WYZ117>119-200700- /O.CON.KCYS.WW.Y.0029.000000T0000Z-210420T0700Z/ Banner County-Kimball County-South Laramie Range Foothills- Central Laramie County-East Laramie County- Including the cities of Harrisburg, Kimball, Whitaker, Federal, Horse Creek, Cheyenne, and Pine Bluffs 1046 PM MDT Mon Apr 19 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM MDT TUESDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches, with 6 to 10 inches for the Snowy Range. Winds gusting as high as 35 mph. * WHERE...Southeast Wyoming and portions of South Central Wyoming including Cheyenne, Kimball, Pine Bluffs, Harrisburg, Whitaker, and Federal. * WHEN...Until 1 AM MDT Tuesday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions could impact the Tuesday morning 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. && $$
058 WWUS45 KCYS 200810 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 210 AM MDT Tue Apr 20 2021 WYZ116-200915- /O.CAN.KCYS.WS.W.0012.000000T0000Z-210420T0900Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 210 AM MDT Tue Apr 20 2021 ...WINTER STORM WARNING IS CANCELLED... Steady snow has ended across the Interstate 80 Summit and surrounding area early this morning. Therefore, the Winter Storm Warning has been cancelled. Additional snow showers are possible this afternoon, but little or no additional snow accumulations are expected into this evening. $$
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.