An outflow from a thunderstorm brought a 60 mph wind to the Natrona County airport.
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The episode as NWS RIW wrote it up.
An outflow from a thunderstorm brought a 60 mph wind to the Natrona County airport.
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 24, 9:23 AM MST, 4 hours 27 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Riverton WY 1023 AM MDT Mon Jun 24 2024 .KEY MESSAGES... - Hot and dry weather persists. Highs may near 95-100 degrees in parts of the CWA once again today. - Afternoon showers may create strong gusty outflow winds with little to no rain reaching the surface. - Chances for precipitation and cooler temperatures look to arrive for the second half of the week. && .DISCUSSION... Issued at 317 AM MDT Mon Jun 24 2024 Yesterday saw record breaking heat arrive to the Cowboy State. Highs ranged from the mid to upper 90s east of the Divide and mid to upper 80s west of the Divide. The Bighorn Basin was the hot spot with Greybull hitting 104 degrees breaking its previous of 101 set back in 2007/2001. After doing some digging in the climate data, the high of 104 was actually one of the top 5 highest temperatures recorded in the month of June for Greybull. Unfortunately the heat will remain for one more day before we see slightly cooler temperatures for Tuesday. Today will be a near copy-paste day as yesterday with the only difference being slightly lower highs and stronger winds. The pressure gradient remains confined as our region is sandwiched between a shortwave to the north and an area of high pressure to the south. Similar to yesterday warm advection will aid in producing temperatures nearly 10-20 degrees above normal. Models are showing some of the warmest temperatures in parts of the Wind River Basin with a (30-60%) chance of seeing 95F or higher temperatures. The Bighorn Basin is expected to once again be the hot spot with eastern portions having a (20-50%) chance of nearing or exceeding the century mark. One thing that may limit the extent of the warming is the possibility of afternoon virga showers developing. Some CAM's have recently shown showers develop in the afternoon but with it being so dry and hot throughout the atmosphere precipitation will struggle to reach the surface. Due to the large difference between dewpoints and temperatures strong gusty outflow winds are possible with any showers. Some CAM's are showing outflow gusts of 30-40 mph in parts of the southern and central CWA. Elevated to near critical fire weather conditions will continue today and through much of the first half of the week. Winds will increase this afternoon with gusts of 25-35 mph at times. The combination of these winds, above normal temperatures, and low RH values will create concerns regarding fire development. The hot and dry conditions continue through the first half of the week. Winds will likely be the only limiting factor in regards to the degree of fire weather conditions as winds are expected to lighten by Tuesday. Warm temperatures and dry conditions continue through the first half of the week. Temperatures are expected to cool slightly, with highs Tuesday and Wednesday around 5 or so degrees cooler than today. The second half of the week will likely bring some relief to the heat and dry conditions. Recent models have started to show the possibility for some showers starting as early as Wednesday. These showers are a result of a potent trough starting to move into the PACNW. This trough looks to push out the area of high pressure that has brought the hot and dry conditions to the CWA. One thing to monitor over the next few days will be the potential for showers and thunderstorms as the trough moves into the region by the second half of the week. The setup looks very similar to last Friday where much of the CWA saw showers and thunderstorms move through. PWAT values are looking above normal with this system so some areas may get some much needed rain to end the week. Temperatures look to cool slightly with this trough as 700 MB temperatures range from 1-7 degrees Friday into Saturday. Overnight temperatures may be chilly in spots those nights, especially west of the Divide where temperatures may flirt with the mid 30s. Overall, the heat and dry conditions are expected to persist for the next few days. Fortunately, there are multiple chances for precipitation by the second half of the week with a brief cooldown as well. && .AVIATION /18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1022 AM MDT Mon Jun 24 2024 Wyoming remains on the northern edge of a ridge with the jet stream to the north in Montana and southern Canada. This ridge is keeping it very dry in the lowest 10-15kft. A weak wave will pass through this afternoon, which may bring some isolated convective activity to the area from a line along and southeast of KRKS to KCPR. The chance for isolated thunderstorms is high enough (20-30%) at KCPR to warrant a TEMPO group of -TSRA, but the biggest threat would be very strong downdraft wind due to the inverted V soundings. Downdrafts will, however, have a long way to go to reach the ground. Other terminals will be SKC for most of the TAF period and it will be breezy through this afternoon. Prevailing VFR for all terminals through the TAF period. Even if an isolated thunderstorm directly impacts KCPR it would likely (80%) remain VFR as most, if not all, of the precipitation would not reach the ground. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...Dziewaltowski AVIATION...Rowe
Hazardous Weather Outlook National Weather Service Riverton WY 408 AM MDT Mon Jun 24 2024 WYZ001>020-022>030-251415- 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- 408 AM MDT Mon Jun 24 2024 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and tonight. Hot and dry conditions today with highs nearing 95-100 degrees in parts of the state. Virga showers may develop this afternoon and have the potential to produce strong outflow winds of 40+ mph. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Tuesday through Wednesday...Hot above normal temperatures continue. The combination of above normal temperatures, breezy conditions and low RH values may lead to elevated to near critical fire weather conditions. Thursday...Gulf moisture will spread into WY along with a shortwave trough. Localized heavy rain is possible with widespread showers and thunderstorms. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
The Riverton/Lander radar (KRIW), 164 km away, was scanning. The volume nearest the first event began at 20:49 UTC.
1 thunderstorm wind. Local standard time, as filed.
A 60 mph wind gust was reported at the Natrona County Airport to the west of Casper.
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: 1196468.