Strong winds blew across the wind prone areas in southeastern Wyoming. Wyoming Department of Transportation sensors along Interstate 80 from Elk Mountain to Laramie had sustained winds into the 50 mph range and gusts as high as 69 mph.
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 blew across the wind prone areas in southeastern Wyoming. Wyoming Department of Transportation sensors along Interstate 80 from Elk Mountain to Laramie had sustained winds into the 50 mph range and gusts as high as 69 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 Cheyenne, WY wrote its last area forecast discussion before the first event at Nov 9, 4:10 PM MST, 4 hours 25 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 410 PM MST Fri Nov 9 2018 .UPDATE... Issued at 410 PM MST Fri Nov 9 2018 Please see latest 00z Aviation Discussion && .SHORT TERM...(This evening through Sunday night) Issued at 235 PM MST Fri Nov 9 2018 Early afternoon upper air/water vapor analyses showed a longwave trough over the eastern half of the CONUS, with another trough approaching the Northern Rockies. Scattered high clouds were spreading southeast into the CWA, producing mostly sunny skies. Temperatures ranged from the mid 20s northeast NE Panhandle to the 30s and lower 40s elsewhere. Winds were variable across western NE, becoming westerly and gusty at times over southeast WY. Little change gleaned from the 12Z models/ensembles with regard to the high wind threat for southeast WY wind-prone areas. GFS/NAM 700mb westerly winds still upwards of 55kt between Elk Mountain/ Arlington, Bordeaux and I-80 Summit west of Cheyenne from 06Z to 12Z Saturday with passage of potent shortwave trough to the north. Good subsidence behind wave will accentuate the mixing of these winds to the surface. Both CAG-CPR and CAG-BRX 850/700 gradients consistently between 50 and 70mtrs between 03Z and 15Z Saturday. High Wind Warnings remain in effect from 5 PM this afternoon to 8 AM Saturday for the I-80 corridors between Cheyenne and Laramie, Laramie and Rawlins, and I-25 between Chugwater and Wheatland. Sustained WSW winds of 35 to 45 MPH with gusts to 65 MPH are likely for these areas. Winds will diminish later Saturday morning into the afternoon as the low level gradient flow and winds aloft decrease. High temperatures Saturday will be milder, especially the eastern plains. Attention then turns to the next upper trough and cold frontal passage Saturday night and Sunday. Snow showers develop Saturday evening along and west of I-25, spreading east into far southwest NE Panhandle by Sunday morning with the first shortwave. Snow tapers off in coverage/intensity Sunday afternoon, but increases once again Sunday night with the passage of the second shortwave. Snow accumulations for the 24 to 36 hour period will range from an inch or less lower valleys/plains to as much as four inches above 9000 feet. There will likely be travel impacts Sunday and Sunday night due to icy/snow covered roadways. It will be much colder, with lows Sunday night in the single digits and teens. Fortunately, winds will be light so wind chill temperatures will not much colder than the ambient temperatures. .LONG TERM...(Monday through Friday) Issued at 235 PM MST Fri Nov 9 2018 Latest models/ensembles prog a upper ridge over the Pacific coast states to deamplify Tuesday through Thursday as shortwave energy tracks across the Northern Rockies and Plains. This pattern will promote dry, breezy and mild weather with temperatures above seasonal normals for mid-November. Some of the models hint at a dry frontal passage Thursday night with slightly cooler temperatures Friday. && .AVIATION...(For the 00Z TAFS through 00Z Saturday evening) Issued at 410 PM MST Fri Nov 9 2018 A windy evening in store mainly on the WY terminal side with winds gusting into the 30kt range under a High Wind Warning for wind prone areas of SE WY. With increased subsidence for a period at the terminal sites, could expect localized speed shear for takeoffs and landings with possible turbulence. VFR conditions expected to persist. && .FIRE WEATHER... Issued at 200 PM MST Fri Nov 9 2018 No fire weather concerns are expected through early next week. It will be breezy to windy tonight and Saturday as a weather disturbance passes by to the north of the forecast area. A stronger disturbance and cold front will bring periods of light snow Saturday night through Sunday night to much of southeast Wyoming. After a brief warmup Saturday, much colder temperatures are forecast Sunday and Monday. Drier, breezy and milder weather returns Tuesday through Thursday. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...High Wind Warning until 8 AM MST Saturday for WYZ106-110-116-117. NE...None. && UPDATE...WM SHORT TERM...MAJ LONG TERM...MAJ AVIATION...WM FIRE WEATHER...MAJ
Hazardous Weather Outlook National Weather Service Cheyenne WY 136 PM MST Fri Nov 9 2018 WYZ106-110-116-117-102045- Central Laramie Range and Southwest Platte County- North Snowy Range Foothills-South Laramie Range- South Laramie Range Foothills- 136 PM MST Fri Nov 9 2018 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT High Wind Warnings remain in effect for the wind prone areas of southeast Wyoming for tonight and early Saturday morning. Please refer to the appropriate products for more details. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Accumulating snow is expected across much of southeast Wyoming this weekend, with the best chances Sunday and Sunday night. Accumulations will range from one two inches. Persons with travel plans from Sunday through early Monday should be prepared for icy road conditions. .Spotter information statement... Spotter activation will not be required. Please relay reports of high winds to the National Weather Service. NEZ002-003-019>021-054-055-095-096-WYZ101>105-107>109-111>115-118- 119-102045- Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne- North Sioux-South Sioux-Converse County Lower Elevations- Niobrara County-North Laramie Range- Ferris/Seminoe/Shirley Mountains-Shirley Basin-East Platte County- Goshen County-Central Carbon County-Southwest Carbon County- Sierra Madre Range-Upper North Platte River Basin-Snowy Range- Laramie Valley-Central Laramie County-East Laramie County- 136 PM MST Fri Nov 9 2018 This hazardous weather outlook is for portions of western Nebraska...east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY Accumulating snow is expected across much of southeast Wyoming this weekend, with the best chances Sunday and Sunday night. Accumulations will range from an inch or less valleys and plains, to two to four inches over the mountains. Persons with travel plans from Sunday through early Monday should be prepared for icy road conditions. .Spotter information statement... Spotter activation will not be required.
The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
Sensor at Halleck Ridge along Interstate 80 measured strong winds with highest sustained wind at 51 mph and several hours gusting into the 60 mph range.
Sensor at Quealy Dome along Interstate 80 measured strong sustained winds greater than 40 mph and gusts up to 69 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, November 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: 787091, 787095.