148 first-hand accounts of flood events in Wyoming, ranked by impact. Each is a NOAA-written narrative of the moment.
Debris carried down by runoff from heavy rainfall clogged a drainage culvert on a small section of Highway 130, resulting in the water washing away the pavement around the culvert shortly after midnight on July 19.
Read the full account →On February 21st temperatures warmed into the 50s across much of the Wind River Basin, this, combined with rain led to rapid melting of snow and led to flooding of ditches along roads as well as sheet flooding across portions of Fremont County north of Riverton.
Read the full account →On the weekend of June 11th and 12th, a stationary front set up across northwestern Wyoming. On June 12th into June 13th an atmospheric river fed moisture into a powerful jet steam along the front and brought an extended period of moderate rain along with occasional heavy rain…
Read the full account →On June 15th, roughly between 300 PM and 415 PM MDT, slow moving thunderstorms fueled by a wet air mass led to heavy rain over parts of Natrona County, including the city of Casper, WY and surrounding suburbs.
Read the full account →Monsoon moisture moved into the state, bring abnormally high precipitable water levels. Thunderstorms formed and moved slowly within very light steering flow, with some storms becoming nearly stationary.
Read the full account →During the late evening of July 30, 2025, numerous thunderstorms developed over the Moneta area to the east of Shoshoni, WY and to the north of Highway 20/26.
Read the full account →Flash flooding occurred across parts of Albany County Wyoming, including the city of Laramie and the eastern part of the Mullen Burn Scar in southwest Albany County the afternoon of 13 August. Slow moving monsoonal thunderstorms impacted southern Albany County.
Read the full account →The combination of a very wet and snowy winter and a rather cool and wet spring set the stage for a prolonged period of flooding along the Wind River.
Read the full account →Three thunderstorms with heavy rainfall moved over the Trapper Creek drainage in short succession during Saturday afternoon, causing localized flash flooding near the confluence of Trapper Creek and Shell Creek.
Read the full account →Intense rainfall accompanied a strong thunderstorm which gained strength just west of Casper before blasting through town. The thunderstorm formed in a uncharacteristically moist airmass where precipitable water values approached 150% of normal.
Read the full account →An extremely slow-moving area of low pressure brought significant rainfall to the Wind River Basin during a 48-hour period from Friday evening, May 6, through Sunday evening, May 8.
Read the full account →A slow-moving upper level low south of Wyoming sent waves of moisture northward over central and eastern Wyoming during the Memorial Day holiday weekend. Measured and estimated rainfall totals ranged from two to around five inches.
Read the full account →The combination of a stalled frontal boundary, jet streak dynamics, and an upper level disturbance sweeping across Wyoming created the conditions necessary to produce severe thunderstorms in central Wyoming. A moisture-laden atmosphere also set the stage for flash flooding.
Read the full account →A strong cold front pushed across Wyoming and into the high plains the evening of June 2nd. Scattered thunderstorms developed ahead and near the cold front and moved east and southeast into western Nebraska.
Read the full account →There were a pair of severe thunderstorms on this day. One storm dropped through Johnson County, Wyoming. Wind gusts to 68 mph were reported along Interstate 25 near Kaycee, Wyoming.
Read the full account →During the night of February 9th, strong Chinook winds developed over the eastern Slope of the Wind River Mountains. Temperatures climbed into the 50s as a result.
Read the full account →A rapid warm up following several weeks of below normal temperatures and above average snowfall led to flooding along the Big Horn River in Washakie and Big Horn Counties. The result was rapidly rising rivers due to ice jams from rivers breaking up as well as rapid snow melt.
Read the full account →Flash flooding of farmland and surrounding buildings occurred after the Interstate Canal breached 1 mile northwest of Lingle. This led to portions of Highway 26 being closed due to high water while many area farm roads were also inundated.
Read the full account →A nearly stationary thunderstorm first developed around 1400MST over the city of Rock Springs. A moisture-laden atmosphere and weak steering winds aloft allowed for the production of very heavy rainfall in a short period of time.
Read the full account →Ice built up on area rivers following very cold temperatures through February and early March. The last cold snap in early March was followed by a round of unseasonably warm temperatures that caused the ice to began melting and to break-up on the Big Horn and Nowood rivers in…
Read the full account →A series of thunderstorms dropped heavy rain over steep terrain about 6 to 10 miles east of the East Entrance to Yellowstone National Park. Flash flooding brought mud and dead tree debris down area streams and creeks, causing impacts to local roads and US Hwy 14 (North Fork…
Read the full account →Ice built up on area rivers following very cold temperatures through February and early March. The last cold snap in early March was followed by a round of unseasonably warm temperatures that caused the ice to began melting and to break-up on the Big Horn and Nowood rivers in…
Read the full account →Ice built up on area rivers following very cold temperatures through February and early March. The last cold snap in early March was followed by a round of unseasonably warm temperatures that caused the ice to began melting and to break-up on the Big Horn and Nowood rivers in…
Read the full account →A slow-moving upper level low south of Wyoming sent waves of moisture northward over central and eastern Wyoming during the Memorial Day holiday weekend. Measured and estimated rainfall totals ranged from two to around five inches.
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