The combination of a passing shortwave and a tight pressure gradient brought high wind to the favored southwest flow areas. Wind gusted as highs as 82 mph along Scenic Drive on the south side of Casper.
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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.
The combination of a passing shortwave and a tight pressure gradient brought high wind to the favored southwest flow areas. Wind gusted as highs as 82 mph along Scenic Drive on the south side of Casper. The Natrona County airport had a maximum gust of 63 mph. Along Highway 220 to the southwest of Casper, wind gusts of 61 mph were recorded.
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 29, 11:32 AM MST, 38 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Riverton WY 1232 PM MDT Mon Jun 29 2026 .KEY MESSAGES... - Light rain/mountain snow continues over western Wyoming through today, with most ending by this evening. - Gusty winds up to 50 mph occur today for much of Wyoming. Wind prone locations could see gusts to about 60 mph. - Another night of cool low temperatures. Western valleys and basins will likely see a frost, with lows in the mid-20s to mid-30s. - Trending warmer this week. Dry and breezy conditions bring elevated fire weather concerns. Rain chances will occur, but are very limited, so most areas remain dry. && .UPDATE... Issued at 1231 PM MDT Mon Jun 29 2026 Most of the area remains dry today. Some very light snow over the western mountains continues through today, though most has already occurred this past morning. Winds are the main forecast point today, with widespread gusts 25 to 50 mph for the area. Wind prone locations see gusts to around 60 mph. Another night of cooler temperatures, with western valleys and basins seeing similar lows tonight as last night, in the mid-20s to low-30s. East of the Divide, lows are in the upper-40s, which could impact some sensitive plants. Tuesday begins a warming trend, with highs around 10 degrees warmer than today. && .DISCUSSION... Issued at 200 AM MDT Mon Jun 29 2026 WV imagery continues to show the deep elongated trough across the Rocky Mountain West, with colder cloud tops through the CWA depicted on IR. Weak, distorted fingers of the PFJ aid in supporting the mainly closed low over Montana with divergence aloft lacking in strong support of any significant weather. A minor S/W is pushing through the CWA overnight giving way to a few light rain showers stretching from eastern Sweetwater northeast to Johnson County that will slowly push east out of the area by sunrise Monday morning. Limited in rainfall if any, due to dry surface conditions, will mainly see an impact of lower cloud cover through a couple hours post sunrise. Less clouds west of the Divide will give way to better radiational cooling to allow for colder temperatures. Western Valleys will see near freezing to just below freezing temperatures near sunrise, but only touching it for less than hour not needing any cold temperatures hazards. The coldest spots will be the usual upper Green River Basin from Pinedale to Bondurant. Beyond the temperatures, the next subtle mid level trough will give way to some light snow above 10kft for western mountains, highest for the Tetons and SW Yellowstone of 2-3 inches (50-60%). Other parts of Yellowstone to the Gros Ventres and Winds could see an inch or so but lower confidence (30-40%). CAMs seem to be a bit bullish on these amounts with much of the impacted areas into MT, to include the Beartooth Pass. Impacts east of the Divide will be of course wind, with the passing shortwave. Increasing gusts by mid Morning over 30 mph to peaking at over 50 mph by noon time. Highest wind speeds expected for the wind prone areas from eastern Sweetwater to Natrona Counties to include South Pass/Greens/Rattlesnakes/Casper Mountain that have a decent chance to breaking 60 mph (30-40%) but not worthy of any wind products for these higher elevations. Other areas of note will include the Cody/Lander Foothills pushing 50 to 55 mph that will keep an eye on to hit high wind criteria of 58mph (~10-15%). Winds will of course, decrease towards sunset Monday evening but remain elevated in these same areas through about midnight. Monday afternoon will also be the "coolest" day of the week, with 70s east of the Divide and 50s mainly to the west (Yellowstone down to the 40s, and even upper 30s for the northeastern part for Lamar Valley). The ample herds of Buffalo will welcome the reprieve of the heat. Beyond Monday, expect a warming and mainly dry trend for the rest of the week and into the holiday weekend of America's 250th birthday celebration. The aforementioned upper level trough will fill with decreasing divergence aloft and push northeast. The west coast will have another deepening L/W trough set up and remain with weak ridging to the east of the CWA. A few subtle shortwaves will push to the north and northeast of the area that will see some weak chances for northern mountains of the Absarokas and Bighorns (20-30%) but storm activity looks to be limited to the higher elevations with minimal accumulations expected. The other thing to keep an eye on will be increasing fire weather risk with warming temperatures/lower humidity values, but no significant wind looks to be forecasted beyond Monday. Independence Day and entire weekend looks to be a seasonable to just above seasonable day in terms of temperatures, with afternoon highs into the 80s east of the Divide and 70s to the west. Limited storm chances look to be confined to just the northern Bighorns, but stay tuned for any updated forecast changes in the coming days. && .AVIATION /18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1145 AM MDT Mon Jun 29 2026 A passing weather system will continue to force gusty west winds at many airports through the daytime hours, with gusts in the 25 to 35 kt range being common. Some of the typically windy airport locations could see gusts to around 40 kt. JAC is the airport most likely to see occasional rain showers before sunset as the weather system pivots across the region. Expect terrain obscurations across western Wyoming through most of the daylight hours. Winds decrease notably after sunset, with lighter winds expected on Tuesday. High cloud cover will also retreat to the northwest overnight, bringing clearer skies Tuesday. && .RIW WATCHES/WARNINGS/ADVISORIES... None. && UPDATE...Wittmann DISCUSSION...Lowe AVIATION...VandenBoogart
The national radar mosaic for the moment the first event began.
2 high wind. Local standard time, as filed.
There were numerous reports of wind gusts over 58 mph in Natrona County, with a maximum gust of 82 mph at Scenic Drive on the south side of Casper.
Wind gusts up to 61 mph were recorded along Highway 220 to the west of the Alcova Reservoir.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2026Every state in 2026This day in weather historyWarnings in Wyoming, June 2026
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: 1352090, 1352091.