A brief period of high gap winds developed across the North Snowy Range Foothills. Peak gusts of 65 to 75 mph were observed.
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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.
A brief period of high gap winds developed across the North Snowy Range Foothills. Peak gusts of 65 to 75 mph were observed.
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 Mar 21, 9:25 PM MST, 2 hours 40 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 1025 PM MDT Wed Mar 21 2018 .SHORT TERM...(This evening through Friday) Issued at 245 PM MDT Wed Mar 21 2018 Upper ridge will build some over the area overnight through Thursday allowing for mild and fairly quiet weather. main difficulty will be with varying amounts of mid and high clouds moving through the ridge ahead of an upper trough near the west coast. A piece of energy will move out ahead of this trough Thursday night and across the region on Friday bringing some rain and mtn snow showers as well as a little cooler air on Friday. Snow levels Friday should stay fairly high with snow mainly over the higher mtn tops. .LONG TERM...(Friday night through Wednesday) Issued at 245 PM MDT Wed Mar 21 2018 Generally mild across the CWA Saturday through Sunday under southwesterly upper flow. Widely scattered mainly afternoon showers possible mainly out west both days as weak impulses lift across the area. Things get more interesting early next week as an upper low cuts off over the southwest CONUS then moves little through Tuesday before opening on Weds. GFS showing quite a bit of pcpn late Monday through Tuesday while the EC a little faster and with less pcpn. Will have to watch closely over the coming days as snow levels look to lower as cooler temps filter into the region. && .AVIATION...(For the 06Z TAFS through 06Z Thursday night) Issued at 1025 PM MDT Wed Mar 21 2018 VFR conditions the next 24 hours across southeast Wyoming and Nebraska Panhandle. Winds on the increase for KRWL Thursday afternoon, becoming more widespread Friday. && .FIRE WEATHER... Issued at 245 PM MDT Wed Mar 21 2018 Fire weather concerns expected to remain low for the rest of the week with most weather factors staying non-critical. Some gusty winds late in the week but cooling temperatures and increasing chances for rain and snow will mitigate conditions. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...RE LONG TERM...RE AVIATION...GCC FIRE WEATHER...RE
Hazardous Weather Outlook National Weather Service Cheyenne WY 534 AM MDT Wed Mar 21 2018 WYZ101>119-221145- 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- 534 AM MDT Wed Mar 21 2018 This hazardous weather outlook is for southeast Wyoming. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY There is a chance for showers and a few thunderstorms for areas west of Cheyenne late Thursday and Friday. Unsettled weather is likely to continue into early next week. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-221145- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux- 534 AM MDT Wed Mar 21 2018 This hazardous weather outlook is for portions of western Nebraska. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .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.
7 high wind. Local standard time, as filed.
The WYDOT sensor at Cooper Cove measured wind gusts of 58 mph or higher, with a peak gust of 77 mph at 23/0115 MST.
The WYDOT sensor at Arlington East measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 22/0040 MST.
The WYDOT sensor at Halleck Ridge measured sustained winds of 40 mph or higher, with a peak gust of 61 mph at 22/2210 MST.
The WYDOT sensor at Arlington measured wind gusts of 58 mph or higher, with a peak gust of 67 mph at 23/0040 MST.
The WYDOT sensor at Wagonhound measured sustained winds of 40 mph or higher.
The WYDOT sensor at Foote Creek measured sustained winds of 40 mph or higher, with a peak gust of 63 mph at 23/0050 MST.
The WYDOT sensor at Strouss Hill measured peak wind gusts of 61 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2018Every state in 2018This day in weather historyWarnings in Wyoming, March 2018
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: 747749, 747745, 747760, 747747, 747763, 747758, 747762.