Strong mid level winds mixed to the surface across the normally wind prone areas East of the Divide. The strongest winds were across the higher elevations of the Green and Rattlesnake Range where wind gusts of 89 mph and 75 mph were recorded at Camp Creek and Fales Rock respectively.
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 RIW wrote it up.
Strong mid level winds mixed to the surface across the normally wind prone areas East of the Divide. The strongest winds were across the higher elevations of the Green and Rattlesnake Range where wind gusts of 89 mph and 75 mph were recorded at Camp Creek and Fales Rock respectively. Strong winds also occurred around Casper, with the highest winds along Wyoming Boulevard on the south side of the city, with a maximum gust of 76 mph. High winds also occurred in the lee of the Absarokas, where a wind gust of 75 mph occurred along the Chief Joseph highway and 72 mph to the west of Clark.
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 Riverton, WY wrote its last area forecast discussion before the first event at Nov 28, 1:16 PM MST, 8 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 116 PM MST Tue Nov 28 2017 .SHORT TERM...This evening through Friday Issued at 116 PM MST Tue Nov 28 2017 Pesky fog lingering into early this afternoon across the low lying areas in the Wind River Basin, otherwise, it was a pretty quiet and dry day with no significant winds. Another system is on the horizon though for Wednesday. We'll see a rapid transition from a surface high over us to rapidly lowering pressures to our north overnight. Strong mid and upper level wsw-sw flow will also develop overnight ahead of our quick hitting Wednesday system. Strong 50-65kt H7 flow will produce a few areas of high winds across the normal suspect areas in the wind corridor (Fales Rock, Camp Creek/Muddy Gap and Outer Drive in Casper) with a lesser chance elsewhere but still gusting 40-50 mph. The lee of the Wind Rivers and Absarokas will also become quite windy later this evening and overnight with threat of high winds for the Absarokas, favored gap areas and around Clark. Will issue a high wind warning for zone 19 (Greens/Rattlesnake Ranges) and the Absarokas/Cody Foothills. Not the highest confidence for the Cody Foothills but the combination of expected very strong flow in the foothills, 14c H7 thermal gradient, wrf cross-sections and calculated Froude around 1 is making me pull the trigger. May not be the longest lasting event but it only takes an hour or two. Little doubt the gaps will howl but we'll see how the rest of the area does. Cold front moves into the far west and north late tonight into Wednesday morning with a quick period of snow in the western mountains, especially nw mtns, but only seeing generally 1 to 3 inches with local 4 inch amounts and a skiff to an inch in the lower elevations/valley floor. A few flurries/period of very light snow across the far nrn sections too Wednesday but with little accumulation. Becoming quite windy in the favored n-nw favored areas during the day Wednesday as the cold front approaches and moves through. System quickly exits late Wednesday with weak transitory ridging for Thursday. A weak ripple is still shown for Friday but that will mainly produce more clouds, a few flurries in the western mountains and an increase in overall wind for the normal areas. .LONG TERM...Friday night through Tuesday night Issued at 116 PM MST Tue Nov 28 2017 Synopsis...An upper level ridge will build over the Northern Rockies at the beginning of the forecast period, in response a developing storm system that will be making its way over the PACNW by 00Z Sun. This system will be positively-to neutrally-tilted as it moves over WY by 12Z Mon. The tail end of this system will cut off from the main flow over the Four Corners by 18Z Tue. The formation of this low will be aided, in part, by a massive upper level ridge over the EPAC and into the Yukon/Northwest Territories. This ridge will bring drier and warmer weather to the forecast area. Discussion...Isolated snow showers will be possible across the northwest Friday night into Saturday. These showers will spread across the rest of the western portions of the forecast area Saturday evening and continue into Sunday. Precipitation in the western valleys will start as rain or a rain/snow mix, before changing over to snow after 03Z Sun. This precipitation will spread eastward across central portions after 12Z Sun. Initially, this will start as snow and eventually change over to rain by 18Z as temperatures warm into the lower to middle 40s. These rain showers will continue eastward over Johnson and Natrona counties Sun afternoon. The timing and speed of the cold front varies between the models, but it will come through Sunday night into Monday. Slight chances of snow will be widespread across the forecast area during this time, before the drier air infiltrates over the area Monday night. A reinforcing system will round the top of the ridge and quickly pass through the region Tue afternoon/evening, as NW flow settles overhead. This system will be dry and, if anything, will be a quick shot of arctic air. && .AVIATION...For the 00Z TAFS through 00Z Thursday Issued at 116 PM MST Tue Nov 28 2017 SKC conditions this evening, with SCT-BKN high clouds entering over NW WY after 06Z. MVFR ceilings will be possible KJAC-KPNA-KBPI by 12Z Wed, with -SN impacting KJAC and the surrounding NW mountains. This snow will not last long and is expected to end by 18Z, as . the cold front passes to the south. Otherwise, the forecast for most terminal sites will be the increasing surface wind tonight after 06Z, along with strong LLWS. Surface wind at KCOD, KCPR and KJAC will be strong enough to not mention LLWS. However, strong winds aloft (010-030) will still occur but be just below LLWS criteria. The winds are expected to last through at least 18Z Wed, as a cold front rapidly passes through northern and central WY. These winds will be gradually decreasing through the afternoon, but will remain gusty through 00Z Thu. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .FIRE WEATHER... Issued AT 116 PM MST Tue Nov 28 2017 Tonight, winds will increasing southwest wind from Eastern Sweetwater through Natrona Counties and in the Cody Foothills and east slope of the Absarokas. Areas of high winds are expected from the Green Mountains to Natrona County from late tonight through midday Wednesday, some areas seeing 50 to 65 mph. The east slope of the Absarokas and Cody Foothills will also see increase west wind later tonight with gusts of 65 to 80 mph in the mountains and areas of gusts 50 to 65 mph across the Cody Foothills into sunrise Wednesday. Out west, we will see our next weather system. Snowfall will focus in the Western Mountains and Valleys with low accumulations of 1 to 4 inches in the mountains and less than an inch in the valleys. Johnson County will pick up in the late afternoon to late evening Wednesday reaching gusts of 45 mph. && .RIW WATCHES/WARNINGS/ADVISORIES... High Wind Warning from midnight tonight to 8 AM MST Wednesday for WYZ002-003. High Wind Warning from 11 PM this evening to noon MST Wednesday for WYZ019. && SHORT TERM...Skrbac LONG TERM...LaVoie AVIATION...LaVoie FIRE WEATHER...Skrbac
Hazardous Weather Outlook National Weather Service Riverton WY 1215 PM MST Tue Nov 28 2017 WYZ001>020-022>030-291200- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Big Horn Basin-Southwest Big Horn Basin- Southeast Big Horn Basin-Owl Creek and Bridger Mountains- Bighorn Mountains West-Bighorn Mountains Southeast- Northeast Johnson County-Southeast Johnson County- Teton and Gros Ventre Mountains-Jackson Hole- Wind River Mountains West-Wind River Mountains East- Upper Wind River Basin-Wind River Basin-Lander Foothills- Green Mountains and Rattlesnake Range- Natrona County Lower Elevations-Casper Mountain-Star Valley- Salt River and Wyoming Ranges-Upper Green River Basin Foothills- Upper Green River Basin-South Lincoln County- Rock Springs and Green River-Flaming Gorge-East Sweetwater County- 1215 PM MST Tue Nov 28 2017 ...High Wind Warning for the Green Mountains and Rattlesnake Range late this evening through Noon Wednesday... ...High Wind Warning for the Absarokas and Cody Foothills from Midnight through 8 am Wednesday... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Windy to very windy conditions are expected to develop tonight in the Absaroka and Wind River Mountains as well as the Wind Corridor from Eastern Sweetwater County through Johnson County and Cody Foothills. High wind warnings cover parts of this area. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday...Another bout of snow for the western and northern mountains with windy to very windy areas. High winds through the morning for the Green Mountains and Rattlesnake Range. Sunday and Monday...A storm system and cold front will slide across the area with sharply colder temperatures, and a chance of snowfall. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report any wind gusts over 50 mph tonight through Wednesday.
The national radar mosaic for the moment the first event began.
4 high wind. Local standard time, as filed.
The RAWS sites at Camp Creek and Fales Rock had many wind gusts over 58 mph. The maximum wind gusts were 89 mph at Camp Creek and 75 mph at Fales Rock.
High winds occurred in around the city of Casper. The strongest winds were along Wyoming Boulevard on the south side of the city, where there were many wind gusts over 58 mph, including a maximum of 76 mph. The ASOS at the Casper Airport had a wind gust of 58 mph.
There was a period of several hours of high wind to the west of Clark. The maximum wind gust recorded was 72 mph.
The wind sensor along the Chief Joseph highway recorded a pair of 75 mph wind gusts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2017Every state in 2017This day in weather historyWarnings in Wyoming, November 2017
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: 725311, 725314, 725313, 725312.