0 inches of snowfall was measured.
Every event with a place to put it; 1 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.
Heavy snowfall was observed by COOP observer near Buford where over 6.0 inches of snowfall was measured.
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 Feb 17, 10:20 AM MST, 1 hour 46 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 1020 AM MST Wed Feb 17 2021 .UPDATE... Issued at 459 AM MST Wed Feb 17 2021 Heaviest snow showers have come to end across the Sierra Madres and Snowy Mountain Ranges this morning; therefore, the Winter Storm Warnings over the mountains have been cancelled. Light snow showers continue to today with maybe an additional inch or two possible before midnight. Next chance for heavier snowfall totals and rates comes Friday through the weekend. && .SHORT TERM...(Today and Thursday) Issued at 310 AM MST Wed Feb 17 2021 Upper level trough continues to dig into the south-central CONUS keeping much of the CWA within a cold air mass, but relatively warm compared to the brutally cold temperatures from this past weekend. 700mb temperatures are hovering around -10C and will decrease to -15C today with an approaching shortwave embedded in the northwest flow aloft. Currently, temperatures are in the teens across most of the area with colder air farther to the east. Chadron and Alliance have even dropped below zero again. A few snow showers developed this evening over southeast Wyoming with a boundary setup along the Laramie Range and weak energy passing aloft. A quick half inch of snowfall has fallen in spots making roads slick, but have now mostly moved south of the CO border. Currently, Winter Storm Warnings remain in effect for the Snowy and Sierra Madre Ranges through 5 AM MST Wednesday. Looking at latest SNOTEL data, only upwards of 0.2" SWE has fallen in the past 6 hours at select sites. Additional snowfall is expected today, but rates will be much lower with an inch or two possible during the day. Therefore, will most likely allow the headlines to expire on time. Mostly cloudy skies are expected Wednesday with temperatures expected to remain below the freezing mark. Again, more snow showers will be possible mostly along the Laramie Range and immediate foothills as the boundary remains in place and another shortwave approaches the area. Nonzero convective instability will be present, which could help produce a few bursts of moderate snowfall in the area, but 0-2 km winds look to be fairly weak which could limit snow squall potential. These snow showers will mostly move out of the area around midnight as the vort max begins to pass through. Upwards of 3 inches will be possible with the biggest concern being along the Interstate 80 Summit between Cheyenne and Laramie. Extended upslope flow could result in higher snowfall totals and potential hazardous travel. Upcoming shifts will need to watch latest trends in case a short-fused headline would be needed. Drier weather is expected Thursday with clearing skies as temperatures remain at or below freezing for most of the area once again. CAG-CPR height gradients begin to increase heading into Thursday night above 50m at 700mb as winds aloft increase heading into Friday. .LONG TERM...(Friday through Tuesday) Issued at 310 AM MST Wed Feb 17 2021 A tightly packed northwest flow aloft with a series of shortwaves pulsing through it will effect southeast Wyoming and the western Nebraska Panhandle with increased wind gusts, especially through the wind-prone areas of southeast Wyoming, as well as carry another plume of moisture into the region for isolated snow showers once again. The mountains will be the ones to benefit most from the incoming snow showers and an enhancing upslope flow, with the possibility of advisory level snow for the end of the week and weekend; however, the combination of winds and snow across the I-80 corridor Elk Mountain to Arlington, between Rawlins and Laramie, tend to suffer due to blowing and drifting snow in periods such as this. Will need to keep a close watch on potential conditions ahead of the event. The upside of the windy conditions will be the 10 degree warmup expected Friday east of the Laramie Range due to compressional warming. By the weekend, the northwesterly flow will turn zonal as a Pacific trough drops into the region bringing widespread light snow showers. Aside from the snow, and a few degrees of drop west of the Laramie Range, there isn't much to speak to until Monday in the trough's wake under northwesterly winds aloft once again. Models have consistently indicated strong winds across a vast area, more extensive than just along the wind-prone corridors, though the wind- prone gap areas will of course see the strongest winds. Compressional warming east of the Laramie Range will raise high temps into the 40s Monday and Tuesday, 30s to the west. Will be pretty dry through this period, but the end of the forecast period hints at another trough passage with some drop in high temps and another chance for light snow showers. && .AVIATION...(For the 18Z TAFS through 18Z Thursday morning) Issued at 1020 AM MST Wed Feb 17 2021 Mainly VFR at the terminals into this evening though some sctd MVFR cigs possible mainly at KLAR and KSNY this afternoon with some snow showers over se Wy and patchy fog over the southern Panhandle. More widespread MVFR/IFR conditions expected tonight in weak upslope flow as a disturbance moves across. Snow showers again mainly over se Wy. Conditions improving Thursday morning. && .FIRE WEATHER... Issued at 310 AM MST Wed Feb 17 2021 No fire weather concerns the next few days as this past weekend's snowfall remains across much of the area along with below average temperatures the next few days. Temperatures will rise back up to near normal this weekend and possibly above normal early next week with strong winds over southeast Wyoming. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && UPDATE...AB SHORT TERM...MB LONG TERM...AB AVIATION...RE FIRE WEATHER...MB
Hazardous Weather Outlook National Weather Service Cheyenne WY 328 AM MST Wed Feb 17 2021 WYZ101>119-181030- 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- North Snowy Range Foothills-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-South Laramie Range-South Laramie Range Foothills- Central Laramie County-East Laramie County- 328 AM MST Wed Feb 17 2021 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered snow showers, especially along the Laramie Range and adjacent foothills this afternoon and evening. Hazardous travel conditions may develop with slick, snow covered roads and reduced visibility. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY High winds possible especially in the wind prone areas of southeast Wyoming, Thursday night through Friday and again early next week. More mountain snow possible Friday with the winds. Falling and blowing snow could create hazardous travel conditions. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-181030- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- 328 AM MST Wed Feb 17 2021 This hazardous weather outlook is for portions of panhandle Nebraska. .DAY ONE...TODAY AND TONIGHT Patchy fog possible this morning reducing visibility. Isolated snow showers possible this afternoon and evening. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed.
The national radar mosaic for the moment the first event began.
1 winter storm. Local standard time, as filed.
Observer located 4 miles southeast of Buford measured 6.3 inches of heavy snowfall.
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, February 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: 936989.