A thunderstorm moving over Green River brought strong wind gusts of 59 mph.
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The episode as NWS RIW wrote it up.
A thunderstorm moving over Green River brought strong wind gusts of 59 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 Jun 10, 12:55 PM MST, 25 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Riverton WY 155 PM MDT Mon Jun 10 2024 .KEY MESSAGES... - Isolated showers and thunderstorms, some on the strong side, will continue through late afternoon. Strong outflow winds and isolated large hail is possible with this activity, as well as brief heavy rain. - Warmer and drier conditions expected Tuesday through much of the week. - Elevated river levels will continue this week. && .DISCUSSION... Issued at 153 PM MDT Mon Jun 10 2024 A strong shortwave visible on water vapor is currently pushing east across northern Wyoming. This will be the impetus for convection today, focused east of the Divide. An associated cold front will drop south through the afternoon, shunting the deeper moisture that was over the area yesterday farther to the east. There are a few showers already ongoing across the Bighorn Basin late this morning, and additional development is expected farther south and east over the next couple of hours. The most favorable environment will be across Johnson and Natrona counties where the better moisture will be. With peak heating, instability will increase with MLCAPE values of 500-1000+ J/kg and lapse rate of 7-8 C/km across these areas. Given the well-mixed boundary layer, strong, gusty outflow winds are the main concern, as well as isolated large hail with the stronger storms. With PWAT values around three quarters to an inch, brief, heavy rain is also possible. This activity will quickly move out by late afternoon as the wave pushes farther east. Tuesday will mark the beginning of a drier period as brief ridging sets up across the region. Temperatures will peak 7 to 10 degrees above average. Humidity will drop to below 20 percent across much of central and southern Wyoming; with a breezy west wind, elevated fire weather conditions will return for the afternoon. By Wednesday a fairly zonal flow will take over, keeping active weather away from the area. Temperatures will rise further, likely peaking in the low to mid 90s for lower elevations east of the Divide. It will be another windy day, meaning another day of elevated to near- critical fire weather conditions. By Thursday flow will become slightly more southwesterly, likely helping to return isolated convection over the mountains. Guidance diverges somewhat on Friday; the general trend is for increased cyclonic flow with a better chance for more widespread convection. Ensemble cluster guidance is still favoring troughing to increase during the weekend. && .AVIATION /18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1140 AM MDT Mon Jun 10 2024 A cold front associated with a shortwave trough will pass through the region today, and will bring a line of potentially strong thunderstorms with it. KWRL and KCPR have the best chances of seeing any impacts from this line of storms and thus have included a TEMPO group to cover the most likely timing of those storms. Expect locally heavy rain, gusty winds, and possibly small hail if a storm passes directly over the terminal and brief MVFR conditions are possible. Otherwise, VFR conditions are expected at all terminals through the period. Breezy west to northwest winds at several terminals will decrease between 00Z and 03Z and will be mostly light through the rest of the period. Behind the line of storms, mostly SKC conditions and light winds are expected through the rest of the period. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on smoke, icing, and turbulence forecasts. && .HYDROLOGY... Issued at 212 AM MDT Mon Jun 10 2024 Rivers and creeks will continue to run high today at Action Stage or below, but look to remain steady for now. SnoTel sites above 9000 ft continue to drop with most sites dropping below 5 inches of SWE. The remaining snow at these sites will likely be gone in the next day or so. The notable exception is sites in the Tetons and portions of Yellowstone NP, where 20-30 inches remain on the ground. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...Myers AVIATION...Hensley HYDROLOGY...LaVoie
Hazardous Weather Outlook National Weather Service Riverton WY 220 AM MDT Mon Jun 10 2024 WYZ001>020-022>030-111230- 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- 220 AM MDT Mon Jun 10 2024 ...Flood Advisories remain in effect for some rivers and creeks in central Wyoming... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and tonight. Widely scattered showers and thunderstorms (20-30%) will be possible across Johnson and Natrona counties this afternoon. A strong to severe thunderstorm cannot be ruled out. Isolated (10%) thunderstorms expected elsewhere across the CWA. Warm temperatures will lead to increased mountain snowmelt. Rising streams and rivers may lead to minor flooding. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Warm temperatures will lead to increased mountain snowmelt. Rising streams and rivers may lead to minor flooding. .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
211 PM MDT Mon Jun 10 2024
WYZ030-102045-
East Sweetwater County-
211 PM MDT Mon Jun 10 2024
...A STRONG THUNDERSTORM WILL IMPACT NORTHEASTERN SWEETWATER COUNTY
THROUGH 245 PM MDT...
At 210 PM MDT, Doppler radar was tracking a strong thunderstorm 8
miles northwest of Bitter Creek Rest Area, which is 32 miles west of
Wamsutter, moving east at 45 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 storm will remain over mainly rural areas of northeastern
Sweetwater County, including the following locations... Red Desert
and Tipton.
This includes Interstate 80 between mile markers 132 and 174.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4160 10874 4182 10884 4205 10816 4162 10793
4159 10793
TIME...MOT...LOC 2010Z 254DEG 38KT 4175 10861
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
HensleyThe Riverton/Lander radar (KRIW), 189 km away, was scanning. The volume nearest the first event began at 20:18 UTC.
1 thunderstorm wind. Local standard time, as filed.
The wind sensor along Interstate 80 in Green River reported wind gusts to 59 mph.
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, June 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: 1196465.