Strong winds aloft and a tight surface pressure gradient produced high winds across portions of southeast Wyoming. Sustained west to southwest winds of 35 to 45 mph frequently gusted between 60 and 70 mph through the wind corridors between Cheyenne and Rawlins and Chugwater and Wheatland.
Every event with a place to put it; 4 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 aloft and a tight surface pressure gradient produced high winds across portions of southeast Wyoming. Sustained west to southwest winds of 35 to 45 mph frequently gusted between 60 and 70 mph through the wind corridors between Cheyenne and Rawlins and Chugwater and Wheatland.
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 31, 5:39 PM MST, 3 hours 21 minutes earlier.
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</html>HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 218 PM MDT SAT OCT 31 2015 WYZ101>119-012030- 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- 218 PM MDT SAT OCT 31 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT VERY WINDY CONDITIONS WILL OCCUR TONIGHT ACROSS THE WIND PRONE AREAS OF SOUTHEAST WYOMING. A HIGH WIND WARNING IS NOW IN EFFECT FOR LOCATIONS ALONG I-25 BETWEEN WHITAKER AND WHEATLAND...AND THE I-80 CORRIDOR IN THE ARLINGTON AREA AND FROM LARAMIE TO CHEYENNE. SOUTHWEST WINDS ARE EXPECTED TO GUST AROUND 60 MPH IN THESE AREAS THROUGH SUNDAY MORNING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY SOUTHWEST WINDS GUSTING 50 TO 60 MPH WILL CONTINUE THROUGH NOON ON SUNDAY FOR THE WIND PRONE AREAS ALONG AND WEST OF THE LARAMIE RANGE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. NEZ002-003-019>021-054-055-095-096-012030- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 218 PM MDT SAT OCT 31 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN NEBRASKA. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY 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.
4 high wind. Local standard time, as filed.
The WYDOT sensor at Cooper Cove measured sustained winds of 40 mph or higher, with a peak gust of 67 mph at 31/2235 MST.
The WYDOT sensor at Arlington measured sustained winds of 40 mph or higher, with a peak gust of 61 mph at 31/2106 MST.
The WYDOT sensor at Halleck Ridge measured sustained winds of 40 mph.
The WYDOT sensor at Bordeaux measured wind gusts of 58 mph or higher, with a peak gust of 59 mph at 31/2310 MST.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, October 2015
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 2026-09-30. Each event’s entry at NCEI: 600809, 600808, 600810, 600822.