A Pacific weather system moved into western Wyoming and brought locally heavy snow to the western mountains. The highest snowfall amounts fell at the Jackson Hole Ski resort where up to 17 inches of new snow fell.
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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 RIW wrote it up.
A Pacific weather system moved into western Wyoming and brought locally heavy snow to the western mountains. The highest snowfall amounts fell at the Jackson Hole Ski resort where up to 17 inches of new snow fell. A report of 14 inches of new snow was noted in the Salt River and Wyoming Ranges.
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 Feb 6, 4:29 PM MST, 3 hours 31 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Riverton WY 429 PM MST Thu Feb 6 2025 .KEY MESSAGES... - Weather system impacts the area Thursday night through Saturday morning. Widespread snow and snow/rain chances Friday. - Gusty winds Friday, strongest across southern Wyoming. - Colder temperatures Saturday behind the cold front. && .DISCUSSION... Issued at 1215 PM MST Thu Feb 6 2025 Not much to note for the remainder of today. Lesser winds will keep temperatures on the lower side compared to yesterday. Highs do still have quite the range though, ranging from the low 40s for southern areas to low 20s across the north. Attention is focused on the next weather system moving into western Wyoming tonight. Snow chances will begin to increase across the western mountains for the latter half of this afternoon, with the main push coming in after 5pm. Zonal flow aloft will keep ample moisture (PWATs up to 175% of normal) advecting into the area. The western mountains (focused on the Tetons, southern Absarokas, Wyoming/Salts, and Wind River Ranges) are the primary moisture receivers of this storm, but enough moisture will be around that all locations will have a chances to see precipitation through Friday. Downsloping will likely keep precipitation totals less for central basins (Bighorn/Wind River). Friday is a bit of a mess. The first factor is precipitation type. By the afternoon, warmer temperatures across southern portions of the area will allow rain/snow (and even primarily rain) mixes to occur. It is difficult to know exactly where this will occur, but current models and trends have this line roughly from Cokeville in Lincoln County northeast to about Kaycee in Johnson County. South of this line will be the most likely areas to see rain or rain/snow mixes. Green River and Wind River Basins may also see this rain/snow mix occur as far north as Pinedale and Crowheart, respectively. Modeled snow levels keep South Pass in snow, so these rain chances are primarily for the lower elevations. As the cold front moves southward through the area Friday afternoon, additional chances of snow/rain showers occur. This will likely be the best chance for precipitation for the Bighorn and Wind River Basins as downsloping limits chances the rest of the day. Though snow will linger past sunrise Saturday, a majority of precipitation will have fallen by then. Snow totals over the western mountains range from 1 to 2 feet where current Winter Storm Warnings are, with totals 6 to 12 inches for Yellowstone and the Absarokas where Winter Weather Advisories are. The Bondurant area is around 8 inches, dropping to about 3 inches near Pinedale, so a Winter Weather Advisory is there too. Outside these highlights, lower elevations are generally less than an inch. The exception is the western valleys (Jackson and Star Valley) where 3 to 8 inches may fall. However, with warmer afternoon temperatures, actual accumulations may be more limited. Given the amounts, plus the winds Friday, have hoisted a Winter Weather Advisory for these valleys as well. The other element to this storm is wind. Winds will begin to increase across western Wyoming and the Wind Corridor (roughly South Pass to Casper) around sunrise Friday. Southwest winds will be strongest ahead of the frontal passage mid-afternoon across southern Wyoming. Widespread gusts 30 to 55 mph occur from southern Lincoln County eastwards to the Casper area. There is about a 30% chance for winds of 55 mph or more for southern Lincoln County into the southern Green River Basin. Western Wyoming will also be windy, with gusts 25 to 35 mph for lower elevations. Winds decrease a little after frontal passage in the afternoon, but will still be gusty until Friday night. There is some concern for blowing snow. However, with the strongest winds across southern Wyoming, this will coincide with the rain/snow mix, and therefore will limit the blowing snow threat. This could still occur though, especially Friday evening when rain/snow mix may become more snow than rain. Western mountain passes, however, will be impacted (blowing snow, limited visibilities) by periods of moderate to heavy snow and gusty winds. Much cooler temperatures follow for Saturday, continuing into next week. Long range models are showing multiple systems move through next week, so continued precipitation chances. && .AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 427 PM MST Thu Feb 6 2025 West of the Divide...KBPI/KJAC/KPNA/KRKS Terminals. The next winter storm is now pushing into western Wyoming. This will bring snow and rain impacts over the next few hours this evening. MVFR conditions are likely at KBPI, KPNA, and KJAC after 02-03Z. IFR conditions are most likely to prevail at KJAC tonight, with lower confidence at KBPI and KPNA. The bulk of the storm will be after sunrise Friday, with IFR conditions continuing at KJAC through Friday evening. This will also be a windy storm with gusts of 20 to 30 knots at KJAC/BPI/KPNA after around 13Z. KRKS will be the outlier and remain VFR through at least Friday morning, with a gusty southwest wind picking up after 16Z. Gusts to 40 knots are likely at KRKS through Friday afternoon. There will also be a chance at a few rain or snow showers passing over KRKS during this time, but confidence on this is fairly low. East of the Divide...KCOD/KCPR/KLND/KRIW/KWRL Terminals. Terminals east of the Divide will not be as widely impacted from the incoming storm. Confidence is highest at KCOD for prevailing MVFR impacts, and potentially for visibility dropping to IFR there after 12Z Friday. Showers will also be observed in the KCPR vicinity this evening, though lower confidence on terminal impacts precludes any prevailing impacts at this time. KLND and KRIW may also see showers in the vicinity after sunrise Friday, with the best chances Friday afternoon. KWRL will also have a chance at snow showers by mid- Friday morning. Otherwise, a gusty wind will develop at KCPR, KLND, and KRIW by Friday afternoon. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory from 11 PM this evening to 11 PM MST Friday for WYZ001-002-013-023-025. Winter Storm Warning from 11 PM this evening to 11 PM MST Friday for WYZ012-014-015-024. && DISCUSSION...Wittmann AVIATION...Myers
Hazardous Weather Outlook National Weather Service Riverton WY 213 AM MST Thu Feb 6 2025 WYZ001>020-022>030-071315- Yellowstone National Park-Absaroka Mountains-Cody Foothills- North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn 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- 213 AM MST Thu Feb 6 2025 ...WINTER STORM WARNING AND WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 11 PM MST FRIDAY... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and tonight. Increasing snowfall chances and gusty winds will bring hazardous winter conditions to the western mountain regions tonight. Strong winds will spread across a majority of western and central Wyoming today. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Friday: Snow continues through the day, with gusty winds creating hazardous winter conditions for western mountains. Much colder temperatures becoming more likely across the state early next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
2 winter storm. Local standard time, as filed.
Heavy snow fell in portions of the Tetons, with 17 inches of new snow at the top of the Jackson Hole Ski Resort.
At the Commissary Ridge, 14 inches of new snow fell.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2025Every state in 2025This day in weather historyWarnings in Wyoming, February 2025
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: 1231317, 1231318.