Strong mid level winds mixed to the surface near Clark and brought locally high winds. The strongest gust recorded was 83 mph to the west of Clark.
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The episode as NWS RIW wrote it up.
Strong mid level winds mixed to the surface near Clark and brought locally high winds. The strongest gust recorded was 83 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 Feb 11, 2:38 AM MST, 6 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 238 AM MST Mon Feb 11 2019 .SHORT TERM...Today through Wednesday night Snow showers will quickly end this morning over Sublette and Sweetwater counties, as the cold front continues to progress eastward. Light snow remains expected over Johnson County through the morning hours today. In the wake of the cold front, light snow will continue over NW portions this morning. Another shortwave will bring the next wave of heavier snow to this area by mid- afternoon and continue through the overnight hours Monday night. Will issue a new round of Winter Weather Advisories for far western zones as a result. Otherwise, much of the forecast area will be windy behind the cold front today. The strongest winds will be in the mountains and from southern Lincoln County to Natrona County, where gusts of 30 to 40 mph will occur. These winds will gradually subside tonight, but will continue over the northern and central mountains and the Wind Corridor into Tuesday. Temperatures will actually be a bit warmer (but still below normal) east of the Divide today, despite 700mb temperatures ranging between -13C and -18C behind the cold front. This will be due to the front helping to mix the stagnant arctic air that is currently in place, as well as being more maritime in nature. Shortwave ridging will then build over the region Tuesday, as another Pacific storm develops and moves southward off the PACNW coast. Periods of light snow will remain possible over NW portions Tuesday and Wednesday. The Pacific storm will finally move onshore during the day Wednesday, with the next wave of snow reaching the far west by late Wednesday afternoon. This has the potential to be another heavy snow maker, similar (or worse) to what occurred over Jackson and the Tetons last Monday. Precipitable water (PW) values are progged to be 150 to 200% of normal (which is what was measured during that heavy snow event). Winter Storm Watches will likely be needed for this event. Strong winds will also be possible by early Tuesday morning near Clark, as the northern branch of the jet exits over the area. 700mb temps will also tighten along the Cody Foothills, with westerly 50kt winds. This looks to be a short-duration event, as the gradient begins to weaken by 18Z Tuesday. A SPS may be needed for the Cody Foothills during the day shift. The gradient will then tighten again by Tuesday evening, as the jet strengthens with 120kt winds. Temperatures will remain cold and below normal Tuesday and Wednesday. SW winds will remain gusty over the Wind Corridor during this time as well, which will also keep temperatures warmer in this area. In addition, the atmosphere should stay well mixed with the northern branch of the jet stream over the state by Wednesday. .LONG TERM...Thursday through Sunday night Thursday looks unsettled over the region as a weather system moves through WY. Snow is to continue in the mountains and a chance of snow for the lower elevations. ECMWF model is stronger than the GFS on the 00Z runs tonight. Leaned the forecast toward the ECMWF. Snow decreases Thursday night as the weather system departs. Friday looks dry east of the divide. Will keep a chance of light snow in the western mountains and valleys as some moisture seems to linger there. A chance of snow in the west Friday night into Saturday morning with another weather system passing by. Looks like a quick shot of snow, but will keep an eye on it in the coming days and adjust as needed. Saturday and Sunday look colder with some light snow at times in the mountains. The lower elevations look dry for now on Saturday and Sunday. && .AVIATION...For the 12Z TAFS through 12Z Tuesday West of the Continental Divide (KJAC, KRKS, KPNA, KBPI) Gusty west wind 20-30kts may produce partial terrain obscurations across the Interstate 80 corridor through Monday afternoon. Areas of MVFR/IFR snow will push back into northwest Wyoming and the western mountains by 18z Monday with higher mountains becoming obscured. Snow combined with strengthening surface SSW winds will likely bring IFR conditions in SN/BLSN to KJAC from 21z Monday until early Tuesday morning. East of the Continental Divide (KCPR, KCOD, KRIW, KWRL, KLND) A cold front will bring isolated to scattered MVFR snow showers vicinity and north of a KWRL-KBYG line until 15z Monday. VFR conditions will then prevail across the area late Monday morning through Monday night. Surface southwest winds will increase to 20- 35kts around midday Monday, from a South Pass to vicinity Casper line and south, causing BLSN and partial terrain obscurations. Increasing west wind and areas of LLWS will also develop along the eastern foothills vicinity KCOD-KDUB Monday afternoon through Monday night with some mountain wave activity possible late Monday evening through 12z Tuesday. && .FIRE WEATHER... Light snow will be possible over portions of Johnson County this morning. Gusty WSW winds will occur over much of the area today, as a new round of snow hits the west later this morning. This snow will continue through the overnight hours tonight. Strong winds will be possible late Monday night near Clark. && .RIW WATCHES/WARNINGS/ADVISORIES... Winter Weather Advisory from noon today to 7 AM MST Tuesday for WYZ001-012-013-023-024. && SHORT TERM...LaVoie LONG TERM...AR AVIATION...Meunier FIRE WEATHER...LaVoie
Hazardous Weather Outlook National Weather Service Riverton WY 240 AM MST Mon Feb 11 2019 WYZ001>020-022>030-121200- 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- 240 AM MST Mon Feb 11 2019 ...Winter Weather Advisories in effect for portions of western Wyoming from 12 PM Monday until 7 AM Tuesday... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Light snow will be possible over portions of Johnson County this morning. Snow will return to far western portions late this morning, continuing through the overnight hours tonight. Periods of moderate to heavy snow possible. Strong winds will develop near Clark late tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Tuesday...Light snow continues over the far west. Strong winds continue near Clark. Wednesday and Wednesday night...Snow continues over the far west. Heavy snow expected through the overnight hours. Thursday...A chance of snow all areas. .SPOTTER INFORMATION STATEMENT... Spotters are urged to report snowfall amounts. Thank you.
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
Strong winds were recorded near Clark. A maximum gust of 83 mph was recorded 5 miles west of Clark.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2019Every state in 2019This day in weather historyWarnings in Wyoming, February 2019
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: 807905.