Alert archive / Wyoming / Winter Weather Advisories in 2021
Winter Weather Advisory 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter weather advisory at Jan 21, 2021, 10:29 PM MST for 4 counties in Wyoming. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Jan 21, 2021, 10:29 PM MST (05:29 UTC)
- Expired
- Jan 22, 2021, 8:00 AM MST
- In force
- 10 hr
- Issued by
- NWS Cheyenne, WY
Counties Albany County, WY, Goshen County, WY, Laramie County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 72 km from the middle of the area, began a volume at 05:30 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.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 5.5 hours before the alert went out and 258 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
- 2063 m above ground
- 0-6 km bulk shear
- 70 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 201 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 Jan 21, 4:49 PM MST, 5 hours 40 minutes earlier.
Area forecast discussion, Jan 21, 4:49 PM MST, 5 hours 40 minutes before
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</html>Hazardous weather outlook, Jan 21, 1:23 AM MST, 21 hours 6 minutes before
Hazardous Weather Outlook National Weather Service Cheyenne WY Issued by National Weather Service Riverton WY 123 AM MST Thu Jan 21 2021 WYZ106-110-116-117-221200- Central Laramie Range and Southwest Platte County- North Snowy Range Foothills-South Laramie Range- South Laramie Range Foothills- 123 AM MST Thu Jan 21 2021 ...High Wind Warning in Effect until 11 AM Thursday... This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT High winds occurring, but diminishing by mid day. Please see the High Wind Warning for details. Some snow possible tonight, but accumulations should be light. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A better chance for accumulating snow will return late Friday into early Sunday. 4+ inches are possible in the Sierra Madre and Medicine Bow Mountains. .Spotter information statement... Spotters are encouraged to report wind gusts and any damage through Thursday morning. WYZ104-105-109-115-221200- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-Laramie Valley- 123 AM MST Thu Jan 21 2021 ...High Wind Warning in Effect until 5 AM Thursday... This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Winds diminishing today. Some snow possible tonight, but accumulation is expected to be light. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A better chance for accumulating snow will return late Friday into early Sunday. .Spotter information statement... Spotters are encouraged to report wind gusts and any damage through Thursday morning. NEZ002-003-019>021-054-055-095-096-WYZ101>103-111>114-221200- Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill- Kimball County-Cheyenne-North Sioux-South Sioux- Converse County Lower Elevations-Niobrara County- North Laramie Range-Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range- 123 AM MST Thu Jan 21 2021 This hazardous weather outlook is for portions of panhandle Nebraska...western Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Some snow possible tonight, but accumulations are expected to be light. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A better chance for accumulating snow will Friday into early Sunday. .Spotter information statement... Spotter activation will not be needed. WYZ107-108-118-119-221200- East Platte County-Goshen County-Central Laramie County- East Laramie County- 123 AM MST Thu Jan 21 2021 ...High Wind Warning in Effect until 11 AM Thursday... This hazardous weather outlook is for portions of southeast Wyoming. .DAY ONE...TODAY AND TONIGHT High winds diminishing by midday. Some snow possible tonight; but accumulations are expected to be light. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A better chance for accumulating snow late Friday into early Sunday. .Spotter information statement... Spotters are encouraged to report wind gusts and any damage through Thursday morning.
In the hours before
Special weather statement, Jan 21, 10:00 PM MST, 29 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 3:22 AM MST | Winter Storm Warning | CYS | Albany, Carbon | 47 hr |
| Jan 22, 12:46 PM MST | Winter Weather Advisory | CYS | Albany, Carbon, Converse, Laramie, Niobrara, Platte | 38 hr |
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.