Rains from thunderstorms and a clogged culvert allowed water to flow across Highway 189 around 6 miles north of Labarge. After the clog was removed, the water receded and the highway reopened.
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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.
Rains from thunderstorms and a clogged culvert allowed water to flow across Highway 189 around 6 miles north of Labarge. After the clog was removed, the water receded and the highway reopened.
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 Jul 22, 10:23 AM MST, 2 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 1123 AM MDT Sun Jul 22 2018 .SHORT TERM...Today through Tuesday night At this early hour we still have a few showers out there this morning. As for today, the question of the day is, how far north will the monsoonal moisture and convection make it. The models do have some differences though with the NAM a bit further north than the GFS. For now, we ran the line mainly south of an Afton to Riverton to Casper line. This could obviously vary a bit though so it will have to be watched. The best coverage would be across southern Wyoming however. Meanwhile, across the north it will get windy at times, especially in the morning with the best cool advection behind a cold front. This will be especially so across northern Johnson County where there could be some wind gusts past 40 mph. This would mainly be this morning with gradually diminishing wind as the pressure gradient lessens. As for fire weather, relative humidity will fall into the teens at times but with the gustiest winds occurring in the morning rather than the afternoon, fire weather highlights will not be needed at this point. Showers should gradually decrease tonight with most activity done by morning. All the models have trended significantly drier for Monday. As a result, we removed most of the precipitation. There could be just enough moisture for an isolated thunderstorm across southern Sweetwater County though, so we added a slight chance along and south of Interstate 80. With more sunshine, temperatures will be warm but nothing unusual for the latter part of July. This mainly dry weather should continue into much of Tuesday as well. By Tuesday afternoon, a weak frontal boundary will move toward the area and stall somewhere around Wyoming, although the models differ on where exactly this will occur. They do agree that this will likely be a late show, and possibly a nocturnal one since that is when some jet energy will be moving over the area. We kept POPs fairly low though until we can nail down position and timing a bit better. .LONG TERM...Wednesday through Sunday Through Saturday, A quasi-stationary front is expected along and east of the Divide. Aloft, relatively weak disturbances are expected at times in a west northwest flow as well as some jet dynamics. This will give much of the area the potential for isolated to locally scattered convection with an emphasis east of the Divide where a better moisture profile will be in place. Models show some drier beginning to work into the forecast area Saturday, but especially Sunday helping to decrease PoPs for next weekend. Temperatures west of the Divide still look seasonal to slightly above average, while areas over the east look to have highs between 5-10 degrees below average dependent upon coverage of precip, cloud cover and frontal location. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1123 AM MDT Sun Jul 22 2018 Isolated showers and thunderstorms will occur over southern and southwest WY into the afternoon and expect showers and thunderstorms to slightly increase in coverage across the south until around 06Z tonight. Will continue with the previous precip timing for Monday, with isolated showers and storms being possible in central WY from KLND to KCPR from 18Z until 06Z tonight. Dry weather will be expected elsewhere through the forecast period. Wind gusts around 30 knots will be possible from any storms in central-southern areas. Expect VFR conditions to continue across the area with the exception of localized MVFR conditions in areas of heavy rain mainly central-south through 06Z tonight. Mountains will be obscured at times in central and southern WY. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .FIRE WEATHER... A cold front will drop southward across the state today and bring somewhat cooler weather. A gusty north to northwest wind will develop this morning in the northern zones, especially in northern zone 281 where windy conditions are likely this morning before slowly diminishing. Although relative humidity will fall into teens at times, times of the lowest humidity and strongest winds will not match. Isolated thunderstorms are possible in the southern half of Wyoming, mainly in the afternoon and evening. Mixing and smoke dispersal will range from fair in some of the basins to very good in the breezier locations. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...Hattings LONG TERM...Murrell AVIATION...Troutman FIRE WEATHER...Hattings
Hazardous Weather Outlook National Weather Service Riverton WY 108 AM MDT Sun Jul 22 2018 WYZ001>020-022>030-231330- 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- 108 AM MDT Sun Jul 22 2018 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight Isolated thunderstorms in the southern half of Wyoming. Windy conditions likely in northern Johnson County this morning. .DAYS TWO THROUGH SEVEN...Monday through Saturday Wednesday through Friday...Isolated to locally scattered thunderstorms especially east of the Continental Divide. .SPOTTER INFORMATION STATEMENT... Spotters urged to report wind gusts past 45 mph and hail. Thank you.
Special Weather Statement National Weather Service Riverton WY 119 PM MDT Sun Jul 22 2018 WYZ014-025-026-222130- Wind River Mountains West-Upper Green River Basin Foothills- Upper Green River Basin- Including the cities of Pinedale, La Barge, Big Piney, and Farson 119 PM MDT Sun Jul 22 2018 Scattered showers and thunderstorms, moving northeast around 15 mph, will produce small hail, wind gusts to 35 mph, dangerous lightning and localized heavy rain across Sublette county through 400 pm mdt. WYZ023-024-027-222130- Star Valley-Salt River and Wyoming Ranges-South Lincoln County- Including the cities of Afton, Alpine, Star Valley Ranch, Thayne, Kemmerer, and Cokeville 119 PM MDT Sun Jul 22 2018 Scattered showers and thunderstorms, moving northeast around 15 mph, will produce small hail, wind gusts to 35 mph, dangerous lightning and localized heavy rain across Lincoln county through 400 pm mdt. WYZ028-029-222130- Rock Springs and Green River-Flaming Gorge- Including the cities of Rock Springs and Green River 119 PM MDT Sun Jul 22 2018 Scattered showers and thunderstorms, moving northeast around 15 mph, will produce small hail, wind gusts to 35 mph, dangerous lightning and localized heavy rain across western Sweetwater county through 400 pm mdt.
The Riverton/Lander radar (KRIW), 161 km away, was scanning. The volume nearest the first event began at 20:00 UTC.
1 flash flood. Local standard time, as filed.
The Sublette County emergency manager reported 14 inches of water flowing across Highway 189 6 miles north of Labarge. The flooding receded after a clogged culvert was cleared.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2018Every state in 2018This day in weather historyWarnings in Wyoming, July 2018
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: 758468.