Alert archive / Wyoming / Winter Weather Advisories in 2021
Winter Weather Advisory 31, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter weather advisory at May 2, 2021, 3:38 AM MDT for Albany County, Carbon County, Laramie County, Wyoming. It took effect at May 2, 2021, 12:00 PM MDT. It was in force for 26 hr.
The area
The counties it named.
The facts
- Issued
- May 2, 2021, 3:38 AM MDT (09:38 UTC)
- In effect from
- May 2, 2021, 12:00 PM MDT
- Expired
- May 3, 2021, 2:29 PM MDT
- In force
- 26 hr
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Carbon County, WY, Laramie County, WY
The radar
The Cheyenne radar (KCYS), 93 km from the middle of the area, began a volume at 09:41 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
Riverton, WY (KRIW), launched 00:00Z, 9.6 hours before the alert went out and 274 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
- 2676 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- -31 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before this winter weather advisory went out at May 1, 10:39 PM MDT, 4 hours 59 minutes earlier.
Area forecast discussion, May 1, 10:39 PM MDT, 4 hours 59 minutes before
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</html>Hazardous weather outlook, May 1, 2:44 PM MDT, 12 hours 54 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY 244 PM MDT Sat May 1 2021 WYZ112-114-116-022045- Sierra Madre Range-Snowy Range-South Laramie Range- 244 PM MDT Sat May 1 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers will remain possible across much of the region through tonight. Some showers may produce locally strong wind gusts up to 50 MPH through early this evening. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Widespread moderate to heavy rain and high-elevation snow will return to the area Sunday afternoon through Monday. Travel and recreational impacts are possible. A Winter Storm Watch is in effect for the Snowy Range. .Spotter information statement... Spotter activation will not be needed. WYZ103>106-109>111-113-115-117-022045- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- Central Carbon County-North Snowy Range Foothills- Southwest Carbon County-Upper North Platte River Basin- Laramie Valley-South Laramie Range Foothills- 244 PM MDT Sat May 1 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers will remain possible across much of the region through tonight. Some showers may produce locally strong wind gusts up to 50 MPH through early this evening. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Widespread showers and thunderstorms are expected on Sunday afternoon, possibly changing to snow Sunday night. Minor snow accumulations are possible. .Spotter information statement... Spotter activation will not be needed. NEZ019>021-054-055-WYZ107-108-118-119-022045- Scotts Bluff County-Banner County-Morrill County-Kimball County- Cheyenne County-East Platte County-Goshen County- Central Laramie County-East Laramie County- 244 PM MDT Sat May 1 2021 This hazardous weather outlook is for portions of panhandle Nebraska and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers will remain possible across much of the region through tonight. Some showers may produce locally strong wind gusts up to 50 MPH through early this evening. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A few strong thunderstorms are possible across southeast Wyoming and the southern Nebraska Panhandle on Sunday afternoon. Small hail, gusty winds, and frequent lightning will be the primary hazards. .Spotter information statement... Spotter activation is not anticipated. NEZ002-003-095-096-WYZ101-102-022045- Dawes County-Box Butte County-Northern Sioux County- Southern Sioux County-Converse County Lower Elevations- Niobrara County- 244 PM MDT Sat May 1 2021 This hazardous weather outlook is for portions of panhandle Nebraska and east central Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers will remain possible across much of the region through tonight. Some showers may produce locally strong wind gusts up to 50 MPH through early this evening. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed.
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 6:29 PM MDT | Special Weather Statement | CYS | Niobrara | 46 min |
| May 2, 3:38 AM MDT | Winter Storm Warning | CYS | Albany, Carbon | 35 hr |
| May 2, 2:19 PM MDT | Special Weather Statement | CYS | Albany | 26 min |
| May 2, 2:46 PM MDT | Special Weather Statement | CYS | Albany | 44 min |
| May 2, 3:27 PM MDT | Special Weather Statement | CYS | Albany | 33 min |
| May 2, 3:45 PM MDT | Special Weather Statement | CYS | Albany | 45 min |
| May 2, 3:59 PM MDT | Special Weather Statement | CYS | Carbon | 46 min |
| May 2, 4:03 PM MDT | Special Weather Statement | CYS | Albany | 42 min |
| May 1, 7:42 PM MDT | Special Weather Statement | CYS | Sioux | 33 min |
| May 1, 8:16 PM MDT | Special Weather Statement | CYS | Dawes | 44 min |
| May 2, 12:15 PM MDT | Special Weather Statement | CYS | Cheyenne | 45 min |
| May 2, 4:21 PM MDT | Special Weather Statement | CYS | Morrill | 39 min |
| May 2, 5:01 PM MDT | Special Weather Statement | CYS | Morrill | 44 min |
| May 2, 5:50 PM MDT | Special Weather Statement | CYS | Morrill | 40 min |
Nearby
Winter Weather Advisories in Wyoming, 2021Every winter weather advisory 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.