Localized high winds developed near Clark, Wyoming ahead of a cold frontal passage. The maximum wind gust reported was 65 mph.
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The episode as NWS RIW wrote it up.
Localized high winds developed near Clark, Wyoming ahead of a cold frontal passage. The maximum wind gust reported was 65 mph.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before the first event at Jan 19, 2:09 PM MST, 51 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 209 PM MST Tue Jan 19 2021 .SYNOPSIS... ISSUED AT 143 PM MST Tue Jan 19 2021 The cutoff low continues to drop southward off the Baja California coast, while the main jet flow remains well to the north across the Canadian border region. The next system passes well to the north on Wednesday, with a deepening surface low over central Manitoba, which will tighten the gradient across the state. This will bring up the winds in the most prone locations around KCOD and from KRKS to KCPR. Winds of 25 to 30kts can be expected, with some gusts near 50 in the KCPR vicinity. This warm southwest flow will bring most temperatures up into the 40s, except for Jackson Hole and Star Valley regions, which have cold air inversion trapped in the valleys. These areas will struggle to reach the low 20s after starting below zero. Models continue to back off of the next trough dropping down the Pacific Northwest coast before sweeping inland. Timing is back farther into Friday before snow starts, with the GFS noting a more robust system vs the EC, which is weak and slightly farther south. Will keep a middle ground with some snow in the forecast, focusing on the higher elevations, and best chances occurring Friday night. Lighter upslope snow would continue for the western mountains into early next week. Models do agree on the trailing trough dropping south from the Gulf of Alaska giving the weekend trough a good push eastward by early next week, but what happens with this trailing trough is highly disputed by models into early next week. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1040 AM MST Tue Jan 19 2021 VFR conditions expected at all sites through the next 24 hours, with only high cirrus returning on Wednesday morning. Winds today will be light for most sites, with the exceptions being KCOD and KCPR. KCOD will see some gusts briefly overnight tonight, while KCPR will see winds ramp up to 20 to 25kts, with gusts of 40kts expected after 06Z tonight, continuing well into the day Wednesday. && .FIRE WEATHER... Issued AT 143 PM MST Tue Jan 19 2021 Winds will remain light today before increasing for the Absarokas and from Rock Springs to Casper tonight into Wednesday. Winds in these areas will reach 25 to 30 mph, with a few gusts near 50 mph possible in the afternoon. This will help with low level mixing for most areas through the rest of the week. Western valleys will be the exception, as cold air inversions remain in place, keeping stable air in place through Thursday. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...Straub AVIATION...Straub FIRE WEATHER...Straub
Hazardous Weather Outlook National Weather Service Riverton WY 217 PM MST Tue Jan 19 2021 WYZ001>020-022>030-202130- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 217 PM MST Tue Jan 19 2021 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...This Afternoon and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Thursday night into Friday...A chance of snow in the west. Friday night and Saturday...A chance of snow over most of the region. Monday...A chance of snow in the west. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Localized high winds developed near Clark, Wyoming ahead of a cold frontal passage. The maximum wind gust reported was 65 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2021Every state in 2021This day in weather historyWarnings in Wyoming, January 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 939003.