A tight pressure gradient and strong winds aloft mixing to the surface brought strong winds to portions of the Cody Foothills. A 63 mph wind gust was reported 8 miles south of Clark.
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The episode as NWS RIW wrote it up.
A tight pressure gradient and strong winds aloft mixing to the surface brought strong winds to portions of the Cody Foothills. A 63 mph wind gust was reported 8 miles south 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 Jan 29, 11:10 PM MST, 1 hour 35 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Riverton WY 1110 PM MST Sun Jan 29 2017 .UPDATE...Added 06z Aviation Discussion. && .AVIATION.../06Z ISSUANCE/ A cold front will moving across the Northern Rockies will continue east into the Northern High Plains Monday morning, with the front pushing into northern Wyoming 12z-15z Monday. Strong west wind will continue along the east slopes of the Divide, vicinity KCOD-30SM south of KDUB, with occasional gusts 40-50kts vicinity COD. These stronger winds will also result in areas of LLWS over shallow basin inversions and vicinity KCPR. Patchy fog may partially obscure terrain over the lower Wind River, Bighorn, and Green River Basins through the morning but confidence is low for impacts at any terminals (KRIW, KLND, KBPI, KWRL), so nothing more than VCFG was included at these sites. Snow showers are expected to increase across NW Wyoming late Monday afternoon into Monday evening with areas of MVFR/IFR conditions and frequent mountain obscurations along and north and west of a vicinity KJAC-30SM west KCOD line by 06z Tuesday. Some of this activity will spread east along the Montana/Wyoming border into the Bighorn Range 06z-12z Tuesday. && .FIRE WEATHER... && .PREV DISCUSSION... /issued 252 PM MST Sun Jan 29 2017/ Short Term...Tonight Through Wednesday The wind flow aloft has shifted from the north to the northwest and will continue to shift to the west through Wednesday. Initially high winds are expected tonight in the Cody foothills and Absaroka mountains with winds significantly increasing along and near the east slopes of the mountains and through the wind corridor from Rock Springs to Casper. Temperatures will continue to warm significantly as inversions in the basins and valleys break. Much of the Big Horn basin will warm, while a cold strip along the Bighorn river may resist mixing. The same is expected in the Wind River basin with a possible narrow strip of cold air from Riverton to Boysen reservoir. Clouds will continue to spread in from the west and late Monday or Monday evening. Areas of light snow is expected to develop in the northwest spreading across Teton and Park counties including Yellowstone National Park. The most significant snowfall is expected Tuesday through Wednesday and at this time it looks like the mountains may see 8 to 14 inches of snow by late Wednesday. Some of the snow will spread across the north over the Big Horn basin...Bighorn Mountains, Johnson and Natrona counties. the southwest is expected to remain dry and windy. Long Term...Wednesday Night Through Sunday Wednesday night will feature a continuation of significant snowfall in Western Wyoming as isentropic lift out ahead of the trough, which will then be in the vcnty Pacific NW heading toward Wyoming as it flattens out the ridge over us now, along with Pacific moisture via a Pineapple connection. Another 7 inches of snowfall is portrayed in the grids for YNP and 5 inches in the Tetons during this time frame with far lesser amount's in the Big Horn Mtns. The snowfall will continue in the northwest through the end of the week with isentropic lift persisting through Thursday night. In the meantime, basin inversions will be barely hanging on Wednesday night, only affecting the lowest river bottoms as the winds earlier in the week will help to shallow them out with the Big Horn Basin remaining colder than the Wind River Basin as this area will be north of the shallow stationary cooler sfc boundary. But by Thursday night, when the aforementioned trough sweeps across the cwa, we will finally get a good dose of mixing, allowing a fresh flow of slightly colder air back into the basins and valleys and temporarily over the higher terrain. The prolonged significant snowfall will continue in the far west Friday and Saturday as more isentropic lift from the southwest gives the snowfall a boost Friday, as the well defined closed low now centered over 150W/35N tracks east and arrived as an open wave Saturday which will continue to pump Pacific moisture into the far west along with milder temps as this low pinches off the narrowing ride between the Pacific NW trough affecting us earlier in the week and this next trough. Aviation.../00Z Issuance/ Northwest flow aloft and a lee side surface trough will remain over the area through tonight. This will result in continued gusty W-SW winds through the wind corridor, KRKS-KCPR, along with areas of LLWS with NW winds 25-30kts 1-2kft off the surface. Lower central basins and western valleys (KWRL, KRIW, KJAC) will remain trapped under steep inversions, although the area within the inversions will be shrinking. A cold front will approach the northern border tonight, with west winds increasing ahead of the front, especially vicinity KCOD-KDUB where some stronger winds 40-50kts may surface, along with some terrain obscurations due to blowing snow. Light snow will break out Northwest Wyoming after around 22Z Monday as Pacific moisture out ahead of a Pacific trough bisects the front resulting in lowering cigs, vsby, and some mtn obscurations. Fire Weather... The wind flow aloft has shifted from the north to the northwest and will continue to shift to the west through Wednesday. Initially high winds are expected tonight in the Cody foothills and Absaroka mountains with winds significantly increasing along and near the east slopes of the mountains and through the wind corridor from Rock Springs to Casper. Temperatures will continue to warm significantly as inversions in the basins and valleys break. Much of the Big Horn basin will warm, while a cold strip along the Bighorn river may resist mixing. The same is expected in the Wind River basin with a possible narrow strip of cold air from Riverton to Boysen reservoir. Clouds will continue to spread in from the west and late Monday or Monday evening. Areas of light snow is expected to develop in the northwest spreading across Teton and Park counties including Yellowstone National Park. The most significant snowfall is expected Tuesday through Wednesday and at this time it looks like the mountains may see 8 to 14 inches of snow by late Wednesday. Some of the snow will spread across the north over the Big Horn basin...Bighorn Mountains, Johnson and Natrona counties. the southwest is expected to remain dry and windy. Mixing in the windy areas will produce fair to low end good smoke dispersal in the afternoons. As the snow spreads across the north and west poor smoke dispersal will result. && .RIW WATCHES/WARNINGS/ADVISORIES... High Wind Warning until 5 AM MST Monday for WYZ002-003. && SHORT TERM...C.Baker LONG TERM...Lipson AVIATION...AEM FIRE WEATHER...C.Baker
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 149 PM MST SUN JAN 29 2017 WYZ001>020-022>030-301200- 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- 149 PM MST SUN JAN 29 2017 ...HIGH WIND WARNING FOR THE CODY FOOTHILLS AND ABSAROKA MOUNTAINS IN EFFECT THROUGH TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TONIGHT STRONG WINDS ARE EXPECTED TONIGHT IMPACTING HIGHWAY 120 NEAR CLARK AND CHIEF JOSEPH HIGHWAY. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY TUESDAY THROUGH WEDNESDAY...SNOW EXPECTED ACROSS NORTHWEST...FAR WEST...AND NORTHERN WYOMING AT TIMES. SIGNIFICANT SNOWFALL POSSIBLE ACROSS NORTHWEST WYOMING. THURSDAY THROUGH SATURDAY...SNOW CONTINUING IN THE FAR WEST. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT WIND SPEEDS GREATER THAN 45 MPH. THANK YOU. TEAM RIVERTON
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
A 63 mph wind gust was recorded 8 miles south-southwest of Clark.
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, January 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: 670162.