A rain shower caused a localized microburst that brought severe wind gusts to the Casper-Natrona County Airport. No damage was reported.
Every event with a place to put it. Tap one for its entry below.
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 rain shower caused a localized microburst that brought severe wind gusts to the Casper-Natrona County Airport. No damage was reported. This wind magnitude is common for this area.
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 Sep 13, 7:01 PM MST, 4 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 801 PM MDT Tue Sep 13 2022 .UPDATE... Issued at 800 PM MDT Tue Sep 13 2022 Despite scattered showers causing localized gusty winds, relative humidities are increasing as surface temperatures cool and a more moist air mass moves into the region from the southwest. Critical fire weather conditions are no longer expected; therefore, Red Flag Warning have been allowed to expire. && .SHORT TERM...This afternoon through Wednesday night Issued at 1120 AM MDT Tue Sep 13 2022 A change in the weather pattern will occur today. The ridge will continue its eastward shift through the day, with the remnants of Hurricane Kay starting to move over western and southwestern portions later this afternoon. Clouds associated with this trough have already increased over southern and western portions this morning and will continue to spread across the rest of the CWA this afternoon. Showers and isolated thunderstorms will move over far southwestern portions early this afternoon, spreading to the north and east across other areas west of the Divide through the afternoon. Precipitable water (PWAT) values are forecasted to increase to near 0.8", as the trough associated with Kay moves over western and southern portions later this afternoon. This will be above the 90th percentile for this time of year. Locally heavy rain will be the main threat with any banded showers or strong thunderstorms, as a result. Strong gusty winds could also occur, as dewpoint spreads will remain large before the atmospheric column has a chance to saturate. Areas east of the Divide will remain dry through much of the day. High temperatures this afternoon will continue to be slightly above normal, reaching the middle to upper 80s. Humidity values will be critical, less than 15 percent. South to southwest winds, with gusts of 25 to 30 mph, will develop over the Wind Corridor and Johnson County early this afternoon. Thus, a Red Flag Warning will be in effect for these areas through 8 PM this evening. Portions of the Bighorn Basin could have southeast wind gusts up to 25 mph, but these look to be more isolated at this time. Smoke is expected to thin out later this afternoon, as the wind flow turns more southerly. This will push the smoke more toward the north- northeast and cut off the source of smoke from the wildfires in ID and MT. Isolated to scattered showers and thunderstorms are possible over southern Fremont County late this afternoon into the evening, as this activity moves northward from Sweetwater County. Showers and thunderstorms will also be possible over portions of the Wind River Basin toward Dubois during this same time frame. Hopefully some of this activity will reach the Washakie Park Fire near the east slope of the Wind river Mountains. Showers will continue over southwestern portions this evening, with scattered showers possible over the Bighorn and Wind River Basins. Showers will be mainly confined to far western portions after midnight, becoming likely by sunrise Wednesday morning. Another shortwave trough will be moving over western WY by this time, with showers spreading over the Absaroka and Wind River Mountains by mid morning. Scattered showers and thunderstorms will be more widespread across the rest of the forecast area by Wednesday afternoon, as through trough continues its eastward progression. Temperatures will be more seasonal across the CWA, as a result of the increased cloud cover. Showers will gradually diminish Wednesday evening, with scattered showers continuing over southern portions Wednesday night. .LONG TERM...Thursday through Tuesday Issued at 211 PM MDT Tue Sep 13 2022 The theme for this discussion is rain. Moisture from Wednesday, combined with a shortwave, will help keep showers/storms going into Thursday morning, especially west of the Divide. Precip chances increase through Thursday, with the best chances west of the Divide, specifically in the northwest. Scattered convection is expected for central and southern areas. Precipitable water (PWAT) values, as mentioned above, will continue to be above the 90th percentile Thursday, so heavy rain continues to be the main concern. Showers from Thursday will continue overnight. North and northwest WY will have the best chances of seeing numerous showers and thunderstorms Friday, with elsewhere seeing scattered activity. Localized moderate to heavy rainfall will again be the concern, as PWAT values remain around 0.80". Southern WY should dry out come sunset, but showers and storms will linger over northern and western portions of the area into Saturday. The focus for showers/storms will again be the northwest for Saturday, as a system from the Pacific Northwest begins to dig southward over the West Coast, increasing the flow aloft from the southwest and bringing in more moisture with it. Precip chances for northwest WY will continue for Sunday and Monday, with Tuesday chances expanding to most of the CWA. Temperatures Thursday will feel cool, with around 70s east of the Divide, and middle 60s west. There will be a slight warmup through Sunday, where temperatures will be in the 70s. Highs will then cool for Monday and Tuesday. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 543 PM MDT Tue Sep 13 2022 VFR conditions will prevail through the period. West of the Divide, scattered showers and storms will be moving northeastward and may impact western terminals at times. As showers and storms move eastward, terminals east of the Divide will see these VCSH chances increase between 02Z and 05Z. Activity will then decrease slightly during the early AM hours Wednesday. Another round of more numerous showers and storms are forecast Wednesday late morning through evening. Gusty outflow winds from nearby showers and locally reduced visibilities with brief heavy rain will be the main concerns over the next 24 hours, and may create brief MVFR conditions. && .FIRE WEATHER... Issued AT 1120 AM MDT Tue Sep 13 2022 Critical fire weather conditions will occur across zones 280, 281 and 289 this afternoon. Conditions will be elevated elsewhere east of the Divide, as wind gusts up to 25 mph will be more isolated. Showers and thunderstorms will occur across areas west of the divide this afternoon, spreading into portions of zones 283/289 late this afternoon/evening. Showers will continue over far western portions tonight, before spreading eastward toward the central basins after sunrise Wednesday morning. Showers and isolated thunderstorms will be widespread across the forecast area Wednesday afternoon. Locally heavy rain will be possible through Thursday, with the best chances occurring over western portions. && .RIW WATCHES/WARNINGS/ADVISORIES... NONE. && UPDATE...VandenBoogart SHORT TERM...LaVoie LONG TERM...Wittmann AVIATION...VandenBoogart/Wittmann FIRE WEATHER...LaVoie
Hazardous Weather Outlook National Weather Service Riverton WY 342 AM MDT Tue Sep 13 2022 WYZ001>020-022>030-141100- 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- 342 AM MDT Tue Sep 13 2022 ...Red Flag Warning in effect for portions of central Wyoming this afternoon... This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Scattered afternoon and nighttime thunderstorms in western Wyoming. Critical fire weather this afternoon in Johnson, Natrona and southeastern Fremont Counties this afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Wednesday through Friday...A chance of afternoon and evening thunderstorms each day. Some storms with locally heavy rain. Saturday and Sunday...A chance of afternoon and evening thunderstorms in the west and northwest. Isolated activity east of the divide. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
The Riverton/Lander radar (KRIW), 164 km away, was scanning. The volume nearest the first event began at 02:06 UTC.
1 thunderstorm wind. Local standard time, as filed.
No lightning was detected in the area, so this was technically not a thunderstorm at the time of the severe wind observation.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2022Every state in 2022This day in weather historyWarnings in Wyoming, September 2022
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: 1058098.