A thunderstorm became severe near Big Piney, WY and produced damage.
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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 thunderstorm became severe near Big Piney, WY and produced damage.
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 Aug 5, 3:01 PM MST, 1 hour 9 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 401 PM MDT Fri Aug 5 2022 .SHORT TERM...(This Afternoon through Saturday Night) Issued at 130 PM MDT Fri Aug 5 2022 Extensive cloud cover across northwest Wyoming early this afternoon as monsoon moisture streams northeast across the state. Available moisture is plentiful with area soundings and satellite derived estimates showing precipitable water values of 0.9 to 1.0 inches, about 150 percent of normal. Enough sun to still boost temperatures to seasonal readings over the southwest and areas of central Wyoming. Northeast Utah and northwest Colorado saw more sun through midday and thunderstorms began to erupt in those areas shortly after noon. This first round of convection continues to ramp up across the forecast area this afternoon especially in areas where cloud cover has not been as extensive. Steering winds take the showers and storms on a northeast trek through late Friday evening. A weak low-level boundary east of the Continental Divide may also aid the potential for overrunning precipitation over northern Wyoming into early Saturday morning. Attention then shifts back to western Wyoming where a shortwave and mid-level circulation arrive prior to sunrise Saturday. The associated axis of moisture drifts a bit westward and favors locations along a line from Afton to Dubois to the Bighorn Basin. Dynamic lift and jet level support combine to aid widespread showers and isolated thunderstorms within this corridor through at least Saturday morning. Areas to the southeast of this region will see a better chance of precipitation by early afternoon due to surface heating. The right entrance region of a jet streak should continue to aid convective development east of the Divide into the evening hours, when Johnson County, Natrona County, and the Bighorns see perhaps their heaviest rain of the two-day period. Drier westerly flow aloft does begin to push into northwest Wyoming late Saturday night effectively bringing an end to the precipitation prior to sunrise Sunday. Only Johnson and Natrona counties could see lingering light showers by sunrise Sunday. If enough clearing occurs in the far west, a moist boundary layer and good radiational cooling would likely lead to low clouds and areas of fog. This needs to be monitored on subsequent shifts. As for temperatures, daytime highs will be below normal Saturday owing to the cloud cover and precipitation. More seasonal overnight lows in store for most areas Saturday night, but the potential clearing in the northwest should allow for some lows in the 30s across Yellowstone National Park. .LONG TERM...(Sunday through Friday) Issued at 130 PM MDT Fri Aug 5 2022 The trough will be across eastern Wyoming with just a few showers still across Natrona and Johnson counties to begin the period. There could be a few storms across central areas due to daytime heating. This activity will exit the area Sunday evening. Monday and Tuesday will see a ridge build into the area for drier and warmer weather. High pressure dominates the pattern for the early part of the week, before shifting eastward through the day Wednesday and allowing for the return of monsoonal moisture in the west. Convective activity develops Wednesday afternoon across the west, and then becomes more prevalent for Thursday and Friday afternoons. Hottest day in the long term looks to be Wednesday as the high will have been hanging around. Temperatures look to climb into the mid to upper 90s, with 100 degree highs expected in the Bighorn Basin. With the shift in the flow overnight into Thursday, the high temperatures will cool off a bit through Friday. Surface winds across the area switch to the west-southwest Thursday with the pattern shift. Models are indicating the southwest gusts along the southern wind corridor will be stronger Thursday and Friday afternoons, but still should stay below 30 mph. && .AVIATION...(For the 00Z TAFS through 00Z Sunday) Issued at 400 PM MDT Fri Aug 5 2022 All terminals to be VFR through about 06Z/Saturday. Monsoon moisture continues to feed into western Wyoming with widespread showers and scattered thunderstorms ongoing. Intensity of the showers and storms wanes between 03Z-06Z/Saturday, but showers to be ongoing overnight. Any local MVFR and outflow wind gusts 25-35kts would be short-lived with the stronger convection. A cold front continues a southward push and reaches the east slopes of the Continental Divide by early evening. This sets the stage for continued rain showers and lowering ceilings in the Bighorn Basin, where KCOD and KWRL have prevailing MVFR ceilings late tonight and Saturday morning. Elsewhere, ceilings from BKN040-060 to be common. Terminals along and west of the Divide, especially KJAC, continue to see widespread showers and thunderstorms through 00Z/Sunday. Convection also pick-up east of the Divide Saturday afternoon. VFR to prevail at all terminals after 18Z/Saturday, with the possible exception of KCOD. Frequent mountain top obscurations to continue across the northwest mountains through the period. Mountain obscurations become more common around the Bighorn Basin between 06Z-18Z/Saturday, with foothills obscured above 7000-7500 feet MSL. 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 130 PM MDT Fri Aug 5 2022 Monsoon moisture tracking northeast across Wyoming will allow for one of the wetter periods of the summer. Many areas can expect a wetting rain by sunset Saturday. The best chance for showers and storms along with rainfall totals of one-half to one inch will be across the Teton and Yellowstone Dispatch areas and locations closer to the Continental Divide in zones 286 and 288. After an initial wave of moisture through early Friday evening, another round arrives late tonight and Saturday morning across northwest Wyoming. Zones east of the Divide should see a break in the action before more widespread showers and storms return Saturday afternoon and early evening. Drier westerly flow aloft begins to reach northwest Wyoming Saturday night. This drier and more stable air pushes across the entire forecast area Sunday with any showers and storms confined to the higher terrain. Temperatures warm again Monday and Tuesday with sunshine and dry conditions to prevail. Smoke dispersal will begin to improve Sunday, a trend that continues into next week. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...CNJ LONG TERM...Swanson AVIATION...CNJ FIRE WEATHER...CNJ
Hazardous Weather Outlook National Weather Service Riverton WY 201 PM MDT Fri Aug 5 2022 WYZ001>020-022>030-061300- 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- 201 PM MDT Fri Aug 5 2022 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...This Afternoon and Tonight. Showers and thunderstorms become more numerous this afternoon and continue into tonight. Some locally heavy rainfall is possible, especially across the mountain ranges of northwest Wyoming. Wind gusts to around 45 mph could occur with the stronger storms across central Wyoming through mid-evening. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. Saturday...Shower and thunderstorm activity continues across the region, with the continued threat for locally heavy rainfall. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
Special Weather Statement
National Weather Service Riverton WY
433 PM MDT Fri Aug 5 2022
WYZ024>026-052315-
Upper Green River Basin-Upper Green River Basin Foothills-Salt River
and Wyoming Ranges-
433 PM MDT Fri Aug 5 2022
...A strong thunderstorm will impact portions of southwestern
Sublette County through 515 PM MDT...
At 433 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles southwest of Big Piney, moving north at 35 mph.
HAZARD...Wind gusts up to 50 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Big Piney and Marbleton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4224 11006 4229 11043 4283 11037 4273 10970
TIME...MOT...LOC 2233Z 201DEG 29KT 4237 11023
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH
RoweSpecial Weather Statement
National Weather Service Riverton WY
437 PM MDT Fri Aug 5 2022
WYZ015-018-019-052300-
Wind River Mountains East-Green Mountains and Rattlesnake
Range-Lander Foothills-
437 PM MDT Fri Aug 5 2022
...A strong thunderstorm will impact portions of south central
Fremont County through 500 PM MDT...
At 436 PM MDT, Doppler radar was tracking a strong thunderstorm near
Red Canyon, or 16 miles south of Lander, moving northeast at 35 mph.
HAZARD...Wind gusts up to 50 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
This strong thunderstorm will be near...
Red Canyon around 445 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4249 10865 4250 10863 4251 10864 4253 10870
4255 10874 4254 10878 4257 10888 4291 10875
4279 10842 4277 10843 4274 10838 4247 10860
TIME...MOT...LOC 2236Z 206DEG 31KT 4259 10871
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
RoweSpecial Weather Statement
National Weather Service Riverton WY
447 PM MDT Fri Aug 5 2022
WYZ014-015-025-026-052330-
Wind River Mountains West-Upper Green River Basin-Wind River
Mountains East-Upper Green River Basin Foothills-
447 PM MDT Fri Aug 5 2022
...A strong thunderstorm will impact portions of east central
Sublette County through 530 PM MDT...
At 447 PM MDT, Doppler radar was tracking a strong thunderstorm near
Big Sandy, or 22 miles southeast of Pinedale, moving north at 25 mph.
HAZARD...Wind gusts up to 50 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This storm will remain over mainly rural areas of east central
Sublette County, including the following locations... Boulder Lake
Campground and Boulder Fish Rearing Station.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4256 10938 4262 10969 4298 10962 4289 10919
TIME...MOT...LOC 2247Z 196DEG 24KT 4267 10951
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH
RoweThe Riverton/Lander radar (KRIW), 149 km away, was scanning. The volume nearest the first event began at 23:09 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Sublette County Emergency Manager reported 4 powerline poles and 2 trees were downed by the strong wind gusts. Minor flooding also occurred in the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2022Every state in 2022This day in weather historyWarnings in Wyoming, August 2022
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: 1052481.