Strong northwest winds occurred in the wake of a shortwave and frontal passage at the Johnson County Airport.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Strong northwest winds occurred in the wake of a shortwave and frontal passage at the Johnson 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 Jul 9, 9:38 PM MST, 2 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Riverton WY 1038 PM MDT Sat Jul 9 2022 .SHORT TERM...This evening through Sunday night Issued at 122 PM MDT Sat Jul 9 2022 If you thought it was hot yesterday, than I have some bad news for you; Today will be even hotter. With continued ridging, 700mb temps will be similar to, or a little higher than yesterday at the +18 to +20C range, which is ample to get the warmer locations east of the Divide into the triple digits. These values will likely be a degree or two more than yesterday. Several areas are already well into the upper 90s as of 1300 MDT. This is the hottest time of the year, climatologically, so though records will be tested, this is not a record heat wave per say. That being said, temperatures are still around 10 to 15 degrees above normal. The other piece of this ridge is the gusty southwesterly flow that will continue to lead to elevated fire weather conditions in addition to the heat today. The RFD remains in effect today for that concern. Convection should also be at a minimal today as well, given very dry air across the area. CAMs are hinting at some weak virga showers trying to develop off the Unitas and moving through central WY late this afternoon, but these will be so weak given dry air, that maybe a little wind gust would be the only possibility out of these, if they do develop. Tomorrow will be similar, but slightly less hot. A shortwave trough approaches the north Sunday afternoon, which will help to flatten the ridge and turn flow more westerly. This will also help to increase cloud cover and decrease temperatures. Sunday will still be hot, just less hot than today by only a few degrees. Today should be the last day of triple digit heat for a few days though, as a result of this trough. The trough will also bring back some chances for showers and thunderstorms, but mainly across the north where the trough energy will help convective initiation along a more moist boundary. With flow becoming more westerly, southerly monsoonal influence should be minimal Sunday, but could see some convection across eastern zones where that moisture will be a little greater. Johnson County, as usual, will be the main area of concern for any stronger storms. Main convective concern will be the usual gusty outflow winds with dewpoint depressions remaining high, even across the north and eastern areas where dewpoints will be higher. Some small hail could occur across the far north where the higher dewpoints exist, but given warm surface and relatively weak updraft strength, most hail will melt before it reaches the ground. Gusty west winds will keep the elevated fire weather conditions around Sunday as well, particularly across the south where the moister boundary will not be much of an influence, if any influence at all , so could see additional RFDs being issued for tomorrow afternoon. Dewpoints, and resultant RHs will trend wetter Sunday late evening, relieving most areas from the elevated fire weather concern by sunset. Temperatures continue to trend down Sunday night, with lows not as warm as previous nights. This is thanks to a cold front which will cross through the north and central areas Sunday evening. Other than somewhat cooler temps and some increased shower and thunderstorm activity across the north, there will be few impacts resulting from the front. .LONG TERM...Monday through Saturday Issued at 122 PM MDT Sat Jul 9 2022 Highs Monday will be much cooler and back to more seasonal normals, in the wake of Sunday's cold front. The flow aloft will be more northwesterly in the wake of the exiting trough. A ridge will build back over the region, extending into Canada and the 500mb high center over the Four Corners. This pattern will continue Wednesday, as the ridge axis gets shunted to the east due to an upper low moving over the western Canadian provinces. Hot and mainly dry conditions will result Tuesday and Wednesday, with 100 degree highs possibly returning to the Bighorn Basin. The flow aloft will turn more southwesterly by Thursday, as the high center moves over the Central Rockies. Shortwaves rotating along the western periphery of the high could bring scattered thunderstorms across western portions Thursday afternoon and evening. Similar conditions are expected again Friday. && .AVIATION...For the 06Z TAFS through 06Z Monday Issued at 1030 PM MDT Sat Jul 9 2022 VFR conditions will occur through the period. A north wind will occur east of the divide overnight due to a weak cold frontal passage. Sunday will see the gusty west wind occur across the west and south by 18Z, then diminish after 02Z Monday. A gusty west wind will develop in central WY from KLND to KCPR between 19Z and 21Z. A second push of north wind will occur Sunday evening in the north, moving into the central by 06Z. Isolated showers or storms will occur over the far north after 00Z, but should stay north of KCOD. Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for the latest information on icing and turbulence forecasts. && .FIRE WEATHER... Issued AT 122 PM MDT Sat Jul 9 2022 Most areas today will see southwest winds with gusts 25 to 30 mph as well as critical RHs around 10 to 15 percent and temperatures 10 to 15 degrees above normal. This results in near critical fire weather conditions. Sunday will see much of the same, with temperatures a few degrees cooler and winds shifting to more westerly. Sunday evening, a cold front will cross through the north and central WY, resulting in an increased moisture and possible showers and thunderstorms across the Big Horn Basin and Zones 281 and 285. By Monday, critical RHs are only expected across the far southwest, with RHs across the rest of the region between 20 to 30 percent. Temperatures will also be near normal Monday. A warming and drying trend will once again take over through much of the rest of the week. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...Hensley LONG TERM...LaVoie AVIATION...AR FIRE WEATHER...Hensley
Hazardous Weather Outlook National Weather Service Riverton WY 213 AM MDT Sat Jul 9 2022 WYZ001>020-022>030-101200- 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- 213 AM MDT Sat Jul 9 2022 This Hazardous Weather Outlook is for Western and Central Wyoming. .DAY ONE...Today and Tonight. Rather hot with gusty winds. Elevated fire weather for most areas this afternoon. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Sunday...Elevated fire weather conditions in central and southern Wyoming. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions. TEAM RIVERTON
Special Weather Statement National Weather Service Riverton WY 1159 PM MDT Sat Jul 9 2022 WYZ010-011-100900- Northeast Johnson County-Southeast Johnson County- Including the cities of Buffalo and Kaycee 1159 PM MDT Sat Jul 9 2022 ...Strong Northwest to North Winds over Johnson County... This is a special weather statement from the National Weather Service Office in Riverton. * WHAT...Northwest to north winds 25 to 35 mph with gusts between 45 and 55 mph. * WHERE...Johnson County. * WHEN...Now through 3 AM. * ADDITIONAL DETAILS...There will be control issues especially for lightweight or high-profile vehicle. Please keep two hands on your steering wheel in case of a strong, sudden gust. 21
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
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, July 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: 1036986.