Strong winds during the afternoon and early evening on the 27th with measured gusts greater than 60 MPH along Interstate 80 between Cheyenne and Laramie along with near the Arlington gap area.
Every event with a place to put it; 2 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
Strong winds during the afternoon and early evening on the 27th with measured gusts greater than 60 MPH along Interstate 80 between Cheyenne and Laramie along with near the Arlington gap area.
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 Cheyenne, WY wrote its last area forecast discussion before the first event at Oct 27, 4:04 AM MST, 5 hours 47 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 504 AM MDT Wed Oct 27 2021 .SHORT TERM...(Today through Friday) Issued at 225 AM MDT Wed Oct 27 2021 All showers have almost completely moved east out of the Nebraska panhandle now with gusty winds 25 to 35 MPH continuing. High Wind Warnings are in effect for the I-80 corridor including the Summit, and Arlington to Elk Mountain for gusty winds 55 to 65 MPH possible today with the highest winds being this afternoon. The GFS has 850 mb CAG-CPR gradients remaining between 55 and 65 from 15Z today until 00Z tomorrow with generally west to northwest flow. Generally gusty winds 35 to 40 MPH will also be felt outside of the High Wind Warning across portions of southeast Wyoming and the southern Nebraska panhandle. Temperatures today will be much cooler than yesterday with highs sitting 5 to 10 degrees below normal. Snow showers remain possible in the Snowy and Sierra Madre Mountain Ranges through today, but after today there is a drying and warming trend across southeast Wyoming and the Nebraska panhandle bringing temperatures back to 5 to 10 degrees above normal by Friday afternoon. .LONG TERM...(Friday night through Tuesday) Issued at 225 AM MDT Wed Oct 27 2021 Unsettled in the long term. Have another frontal passage moving through the area Saturday that will bring rain and mountain snow to our western zones. Could be a pretty good event if the slower ECMWF solution comes true. GFS blasts the front through into Colorado Saturday night...but ECMWF slower with the front and keeps precip over the area through Sunday afternoon. Will see how later model runs handle this front. Looks like a cold period after the front moves through. GFS 700mb temperatures stay below freezing through at least Wednesday next week...so colder temperatures than what we have been experiencing looking likely. && .AVIATION...(For the 12Z TAFS through 12Z Thursday morning) Issued at 500 AM MDT Wed Oct 27 2021 VFR conditions across southeast Wyoming and the Nebraska panhandle with gusty winds expected to persist everywhere through the TAF period. Wind Gusts between 35 and 45 knots possible in southeast Wyoming, 20 to 25 knots in the Nebraska panhandle. && .FIRE WEATHER... Issued at 225 AM MDT Wed Oct 27 2021 Little to no fire weather concerns for the upcoming week with many areas across southeast Wyoming and the Nebraska panhandle having just received wetting rain/snow recently. Strong, gusty winds expected across southeast Wyoming and the southern Nebraska panhandle Wednesday with much cooler temperatures. Dry and cool conditions expected until Sunday when another cold front is expected to move through southeast Wyoming and the Nebraska, bringing another round of widespread precipitation and gusty winds. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...High Wind Warning until 6 AM MDT Thursday for WYZ110-116. NE...None. && SHORT TERM...LK LONG TERM...GCC AVIATION...LK FIRE WEATHER...LK
Hazardous Weather Outlook National Weather Service Cheyenne WY 430 AM MDT Wed Oct 27 2021 NEZ002-003-019>021-054-055-095-096-WYZ101>109-111>115-117>119- 281030- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-Central Carbon County- Southwest Carbon County-Sierra Madre Range- Upper North Platte River Basin-Snowy Range-Laramie Valley- South Laramie Range Foothills-Central Laramie County- East Laramie County- 430 AM MDT Wed Oct 27 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Gusty winds 25 to 35 MPH possible through today and tonight. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Warming and drying trend until the weekend. Possible widespread rain and snow showers Saturday through Tuesday with much colder temperatures. .Spotter information statement... Spotter activation will not be needed. WYZ110-116-281030- North Snowy Range Foothills-South Laramie Range- 430 AM MDT Wed Oct 27 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT High Wind Warning in effect for wind gusts between 55 and 65 MPH likely throughout the day with the highest winds being in the afternoon. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Warming and drying trend until the weekend. Possible widespread rain and snow showers Saturday through Tuesday with much colder temperatures. .Spotter information statement... Spotter activation will not be needed.
Special Weather Statement National Weather Service Cheyenne WY 1037 AM MDT Wed Oct 27 2021 WYZ117-118-272300- South Laramie Range Foothills-Central Laramie County- Including the cities of Whitaker, Federal, Horse Creek, and Cheyenne 1037 AM MDT Wed Oct 27 2021 Strong west to northwest winds with gusts around 50 MPH have developed late this morning along the South Laramie Range Foothills. These winds are expected to continue through this afternoon and may even briefly spread eastward into Central Laramie County including Cheyenne. Use caution while driving as strong cross winds could make travel difficult. This includes portions of Interstates 25 and 80 near Cheyenne. Brothers
The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
Multiple WYDOT and UPR mesonet stations measured strong wind gusts along and near Interstate 80. UPR mesonet station UR535 - SHERWS measured maximum wind gust.
WYDOT mesonet station KARL - Arlington along Interstate 80 measured maximum wind gust. Interstate 80 between Rawlins and Laramie was closed for an hour to light, high profile vehicles.
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, October 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: 983959, 983958.