A mesonet weather station to the northwest of Pinedale reported a wind gust of 63 mph.
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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 mesonet weather station to the northwest of Pinedale reported a wind gust of 63 mph.
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 10, 11:49 AM MST, 2 hours 11 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Riverton WY 1249 PM MDT Sat Aug 10 2024 .KEY MESSAGES... - Showers and thunderstorms today across the entire area. Gusty wind and hail are the main concerns. Rain chances continue into the night. - Most remain dry Sunday, though a few showers and storms will be around. High temperatures climb a few degrees. - More active, rain chance-wise, to start the workweek. && .DISCUSSION... Issued at 1248 PM MDT Sat Aug 10 2024 Another cool afternoon, with highs generally in the low 80s. Showers and thunderstorms are once again possible this afternoon and evening as vorticity maximums move through the state, with CAPE values up to around 1000 J/kg. Similar to yesterday, everywhere will have a shot to see rain. The best chances (40% to 70%) are across the northern half of the area, with chances generally around 30% for the southern area. The main concern with any storms today are gusty winds, with 30 to 40 mph looking to be the most likely, though there is definitely potential for gusts 50 mph or more. Locally heavy rain is also possible, though convection should be moving, so training storms would be the only big concern when it comes to flooding. The last threat would be from hail, notably for locations east of the Continental Divide. Model soundings are showing indications for a few organized cells, and given decent precipitable water (PWAT) values around an inch, some hail is possible. The main threat of severe weather comes to an end late this evening. Upper-level support should keep showers and storms going into the night, again, mainly across northern portions of the area and into Natrona County. Some high-resolution models are showing some convection move across Sweetwater County tonight as well, though confidence is low. A shortwave ridge moves through Sunday. Models are keeping the area mostly dry. A few showers/thunderstorms may form and move off the Absaroka and Bighorn Mountains, as well as for far southwestern Wyoming (mainly off the Uinta Mountains). High temperatures should also climb a few degrees higher than today. Elevated fire weather conditions may be in place for Sweetwater and southern Lincoln County as relative humidities decrease to 15% to 18%, and afternoon gusts of 20 to 30 mph occur. More active this coming workweek as moisture is pushed into Wyoming. Showers and thunderstorms will be possible each afternoon. The first few days of the week will have the best chances as a low to the northwest helps enhance lift. Currently, Monday afternoon has widespread 40% to 70% chances, though this should become more refined in the next 24 hours. Signs of high pressure rebuilding begins towards the end of next week. This would warm temperatures and reduce rain chances. && .AVIATION /18Z TAFS THROUGH 18Z SUNDAY/... Issued at 1212 PM MDT Sat Aug 10 2024 Convection is the aviation forecast challenge today. Isolated showers and thunderstorms early this afternoon will become more widespread by 20-21Z. All terminals carry a tempo for thunderstorms, with the best and most prolonged chances generally impacting terminals east of the Divide. Most of this activity will wane after 00Z, but another wave will kick off additional convection mainly east of the Divide through 06-07Z. The primary hazard with storms today will be strong wind gusts, though hail with the stronger cells is also possible. Skies will become mostly clear toward sunrise Sunday. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on smoke, icing, and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... && DISCUSSION...Wittmann AVIATION...Myers
Hazardous Weather Outlook National Weather Service Riverton WY 231 AM MDT Sat Aug 10 2024 WYZ001>020-022>030-111245- 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- 231 AM MDT Sat Aug 10 2024 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Showers and thunderstorms will be possible through much of the afternoon and evening. Gusty winds and locally heavy rain will be the main threats. .DAYS TWO THROUGH SEVEN...Sunday through Friday... Monday through Wednesday...Scattered afternoon showers and thunderstorms. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
Special Weather Statement
National Weather Service Riverton WY
108 PM MDT Sat Aug 10 2024
WYZ030-101945-
East Sweetwater County-
108 PM MDT Sat Aug 10 2024
...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL SWEETWATER COUNTY
THROUGH 145 PM MDT...
At 108 PM MDT, Doppler radar was tracking a strong thunderstorm 38
miles south of Bitter Creek Rest Area, which is 47 miles southeast of
Rock Springs, moving northeast at 25 mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This storm will remain over mainly rural areas of south central
Sweetwater County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4131 10882 4135 10836 4100 10820 4100 10889
TIME...MOT...LOC 1908Z 240DEG 23KT 4110 10861
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
WittmannSpecial Weather Statement
National Weather Service Riverton WY
135 PM MDT Sat Aug 10 2024
WYZ012-013-023-024-102000-
Star Valley-Jackson Hole-Teton and Gros Ventre Mountains-Salt River
and Wyoming Ranges-
135 PM MDT Sat Aug 10 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN LINCOLN AND
SOUTHWESTERN TETON COUNTIES THROUGH 200 PM MDT...
At 135 PM MDT, Doppler radar was tracking a strong thunderstorm near
Palisades Reservoir, moving east at 35 mph.
HAZARD...Wind gusts up to 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This storm will remain over mainly rural areas of northwestern
Lincoln and southwestern Teton Counties.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4342 11104 4341 11067 4309 11071 4320 11105
TIME...MOT...LOC 1935Z 281DEG 28KT 4332 11116
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
HensleySpecial Weather Statement
National Weather Service Riverton WY
203 PM MDT Sat Aug 10 2024
WYZ030-102030-
East Sweetwater County-
203 PM MDT Sat Aug 10 2024
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN SWEETWATER COUNTY
THROUGH 230 PM MDT...
At 203 PM MDT, Doppler radar was tracking a strong thunderstorm 23
miles south of Wamsutter, moving east at 35 mph.
HAZARD...Wind gusts up to 50 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This storm will remain over mainly rural areas of southeastern
Sweetwater County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4152 10829 4152 10793 4140 10793 4140 10792
4133 10791 4100 10792 4100 10826
TIME...MOT...LOC 2003Z 259DEG 31KT 4133 10800
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH
WittmannSpecial Weather Statement
National Weather Service Riverton WY
254 PM MDT Sat Aug 10 2024
WYZ012-014-025-102130-
Wind River Mountains West-Upper Green River Basin Foothills-Teton and
Gros Ventre Mountains-
254 PM MDT Sat Aug 10 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN SUBLETTE COUNTY
THROUGH 330 PM MDT...
At 254 PM MDT, Doppler radar was tracking a strong thunderstorm near
Bondurant, which is 26 miles southeast of Jackson, moving east at 30
mph.
HAZARD...Nickel size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vegetation is possible.
This storm will remain over mainly rural areas of northwestern
Sublette County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4328 11030 4326 10977 4287 10986 4292 11015
4296 11020 4296 11023 4300 11027 4300 11033
4308 11033 4308 11036 4306 11039 4306 11040
4314 11040
TIME...MOT...LOC 2054Z 280DEG 25KT 4316 11048
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...<30 MPH
HensleyThe Riverton/Lander radar (KRIW), 142 km away, was scanning. The volume nearest the first event began at 20:58 UTC.
2 thunderstorm wind. Local standard time, as filed.
Wind damaged a large semi-permanent tent structure at the Sublette County Fairgrounds.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2024Every state in 2024This day in weather historyWarnings in Wyoming, August 2024
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: 1213151, 1204320.