Alert archive / Wyoming / Winter Storm Warnings in 2021
Winter Storm Warning 7, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter storm warning at Feb 17, 2021, 12:06 PM MST for Albany County, Laramie County, Wyoming. It was in force for 15 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 17, 2021, 12:06 PM MST (19:06 UTC)
- Expired
- Feb 18, 2021, 3:01 AM MST
- In force
- 15 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 19:06 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 7.1 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1005 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
364 WWUS45 KCYS 171906 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 1206 PM MST Wed Feb 17 2021 ...LOCALLY HEAVY SNOW THIS AFTERNOON AND EVENING ALONG INTERSTATE 80 BETWEEN LARAMIE AND CHEYENNE... WYZ116-181200- /O.NEW.KCYS.WS.W.0007.210217T1906Z-210218T1200Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 1206 PM MST Wed Feb 17 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 5 AM MST THURSDAY... * WHAT...Heavy snow. Total snow accumulations of 4 to 8 inches expected, with locally higher amounts possible. * WHERE...South Laramie Range including the Interstate 80 Summit between Laramie and Cheyenne. * WHEN...Now until 5 AM MST Thursday. The heaviest snow will occur this afternoon and evening. * IMPACTS...Dangerous travel conditions due to icy, snow covered roads and reduced visibilities in heavy snow. 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. && $$ WYZ117-181200- /O.NEW.KCYS.WW.Y.0016.210217T1906Z-210218T1200Z/ South Laramie Range Foothills- Including the cities of Whitaker, Federal, and Horse Creek 1206 PM MST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 AM MST THURSDAY... * WHAT...Snow. Total snow accumulations of 3 to 6 inches expected. * WHERE...South Laramie Range Foothills including Interstate 80 between Laramie and Cheyenne. * WHEN...Now until 5 AM MST Thursday. The heaviest snow will occur this afternoon and evening. * IMPACTS...Dangerous travel conditions due to icy, snow covered roads and reduced visibilities in heavy snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ CLH
1 follow-up statement
235 WWUS45 KCYS 181001 WSWCYS URGENT - WINTER WEATHER MESSAGE National Weather Service Cheyenne WY 301 AM MST Thu Feb 18 2021 ...SNOW AND BLOWING SNOW WILL LEAD TO HAZARDOUS ROAD CONDITIONS ALONG THE I-80 CORRIDOR BETWEEN LARAMIE AND RAWLINS THIS AFTERNOON THROUGH FRIDAY AFTERNOON... WYZ116-181115- /O.CAN.KCYS.WS.W.0007.000000T0000Z-210218T1200Z/ South Laramie Range- Including the cities of Buford, Pumpkin Vine, and Vedauwoo 301 AM MST Thu Feb 18 2021 ...WINTER STORM WARNING IS CANCELLED... Light snowfall is largely over with areas of dense fog remaining in its place; therefore, have opted to cancel the Advisory. Roads remain slick and fog has reduced visibilities to drive carefully if traveling this morning. $$ WYZ117-181115- /O.CAN.KCYS.WW.Y.0016.000000T0000Z-210218T1200Z/ South Laramie Range Foothills- Including the cities of Whitaker, Federal, and Horse Creek 301 AM MST Thu Feb 18 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Light snowfall is largely over with areas of dense fog remaining in its place; therefore, have opted to cancel the Advisory. Roads remain slick and fog has reduced visibilities to drive carefully if traveling this morning. $$ WYZ110-200000- /O.NEW.KCYS.WW.Y.0017.210218T2300Z-210220T0000Z/ North Snowy Range Foothills- Including the cities of Arlington and Elk Mountain 301 AM MST Thu Feb 18 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 5 PM MST FRIDAY... * WHAT...Snow and blowing snow expected. Total snow accumulations of up to one inch. Winds gusting as high as 70 mph. A High Wind Warning is in place as well. * WHERE...Arlington to Elk Mountain along Interstate 80 between Laramie and Rawlins. * WHEN...From 4 PM this afternoon to 5 PM MST Friday. * IMPACTS...Plan on slick road conditions due to blowing and drifting snow. Falling and blowing snow could significantly reduce visibility below one half mile 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. && $$
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 17, 12:06 PM MST | Winter Weather Advisory | CYS | Albany, Laramie | 15 hr |
| Feb 17, 2:32 PM MST | High Wind Watch | CYS | Albany, Carbon, Laramie, Platte | 13 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.