A strong thunderstorm developed over Hot Springs and Park County and peaked in intensity over Washakie County. There were reports of nickel sized hail near Worland.
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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 strong thunderstorm developed over Hot Springs and Park County and peaked in intensity over Washakie County. There were reports of nickel sized hail near Worland.
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 2, 10:32 AM MST, 1 hour 34 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 1132 AM MDT Tue Jul 2 2019 .SHORT TERM...Today and tonight Another day of convective weather across much of the Cowboy State today. The Gulf remains open today (continuing through Thursday), keeping dewpoints in the 40s and 50s for areas east of the Divide. The higher dewpoints (low to middle 50s) will be in Johnson County, with upper 40s to near 50 degrees will be in the Bighorn Basin. The strongest instability will be over Johnson County, with Cape values of 2000-2500 J/kg and LI's of -6 to -8, leading to severe storms with large hail and strong damaging winds being likely this afternoon. Directional shear is considerable enough for tornadoes to be a threat as well. The threat for severe storms is a bit lower in the Bighorn Basin, with Cape values of 1000-1500 J/kg (this is about 500-1000 J/kg lower compared to Monday) and LI's of -2 to -4. However, directional shear will be somewhat significant with veering winds in place. Isolated to scattered thunderstorms will also be possible over southern portions. This will mainly occur over Sweetwater County northward to southern portions of Fremont and Natrona counties. These storms will be less severe and be more of a dry thunderstorm variety. Drier air will begin to infiltrate southwestern portions today, which will also aid in lowering the dewpoints across the aforementioned areas. This dry air, combined with southwest winds with gusts of 25 to 30 mph, will also lead to elevated fire conditions across southern WY. Overall, storms will be moving to the east-northeast through the afternoon and end across much of the area this evening. Isolated storms could be ongoing over Johnson and Natrona counties after sunset this evening, but will end by midnight. A cold front, over S MT, will progress southward into N WY late this afternoon and quickly make it to central portions by 06Z Wednesday. Higher RH's and lower clouds will spread behind the front, reminiscent of the low clouds that developed over the weekend. .LONG TERM...Wednesday through Monday Afternoon and evening showers and thunderstorm chances will continue through the week as several shortwaves embedded within the upper flow sweep across the forecast area. The best coverage will be in northern Wyoming and over higher elevations. With a drier airmass and an increasing southwest flow across southwestern Wyoming, relative humidities will return to the teens on Wednesday and elevate fire weather conditions. By Friday, models suggest the low sitting to the northwest will finally lift across Montana. Gusty winds are likely towards the end of the week as the pressure gradient tightens in response to the lifting low. Afternoon temperatures will remain warm through the period with the warmest day likely Sunday as stronger ridging sets in. A shortwave lifting across the Intermountain West and Northern Rockies will dampen this ridge for Monday with more zonal flow anticipated to begin next week. && .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) Issued at 1125 AM MDT Tue Jul 2 2019 Convection starting to fire this afternoon, approaching both COD and RKS. Expect VCTS expending to WRL, CPR, RIW and LND later this afternoon, with variably gusty winds expected. Thunderstorm activity is expected to decrease around sunset, with the thunderstorms moving off to the northeast. A cold front will drop southward across the Big Horn Basin late this afternoon and from CPR across the Wind River basin this evening. Areas north of the front will see lighter north winds and MVFR cigs through most of the night. The front will not move much in the morning, so any lower clouds will have a hard time eroding through noon. && .FIRE WEATHER... Strong to severe thunderstorms will be possible over northern portions this afternoon. Tornadoes cannot be ruled out in these areas, but will be more likely over zones 281 and 285. Elevated fire conditions will return across southern zones this afternoon. Isolated to scattered thunderstorms will also occur over zones 279 and 289. These will more than likely be dry thunderstorms, due to the infiltration of the drier air. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM...LaVoie LONG TERM...Myers AVIATION...Straub FIRE WEATHER...LaVoie
Hazardous Weather Outlook National Weather Service Riverton WY 338 AM MDT Tue Jul 2 2019 WYZ001>020-022>030-030945- 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- 338 AM MDT Tue Jul 2 2019 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Scattered afternoon and evening thunderstorms, especially across the Bighorn Basin, Johnson County, and the Absaroka Mountains where some of the storms may be strong to severe. Elevated fire conditions over southern and southwestern Wyoming. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday and Independence Day...Scattered afternoon and evening thunderstorms across mainly northern and northwestern Wyoming. It will be driest across southwest Wyoming. Wednesday through Independence Day...Elevated fire conditions possible over southwest Wyoming. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to standard operating procedures.
The Riverton/Lander radar (KRIW), 104 km away, was scanning. The volume nearest the first event began at 19:07 UTC.
1 hail. Local standard time, as filed.
Trained spotters reported nickel sized hail near Worland.
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, July 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: 829377.