148 first-hand accounts of flood events in Wyoming, ranked by impact. Each is a NOAA-written narrative of the moment.
The warmest temperatures of the summer season produced snowmelt runoff in the drainages of the western Bighorn Mountains. Creeks and streams in Big Horn and Washakie counties quickly rose in response to the increased runoff. The flooding subsided during the morning of July 1.
Read the full account →A supercell thunderstorm moved southeastward across southern Campbell County, producing large hail and strong wind gusts. Extensive hail damage occurred in Wright, with many homes and vehicles affected, with the Noonan and Casner subdivisions receiving the most damage.
Read the full account →In the early evening hours, a strong thunderstorm and its associated heavy rainfall neared the Casper area dropping a significant amount of rainfall.
Read the full account →A significant push of monsoonal moisture brought rainfall to much of Wyoming on 8/27/25. Thunderstorms with high rainfall rates near Jeffrey City led to flash flooding for portions of the town. The public reported ponding water in low spots throughout Jeffrey City.
Read the full account →A Pacific low moved into the four corners region on the 17th and migrated northeast into the Dakotas through the 22nd, bringing a round of heavy precipitation aided by a tap of Gulf of Mexico moisture.
Read the full account →The warmest temperatures of the summer season produced snowmelt runoff in the drainages of the western Bighorn Mountains. Creeks and streams in Big Horn and Washakie counties quickly rose in response to the increased runoff. The flooding subsided during the morning of July 1.
Read the full account →Showers and thunderstorms developed off the Wasatch and Uinta Mountains mid-afternoon on Sunday the 18th of August. They crossed into southwest Sweetwater County and brought locally heavy rainfall.
Read the full account →A strong upper level system moved across the region, bringing significant rainfall to the Bear Lodge Mountains. Four to five inches of rain fell in about 24 hours. Runoff caused smaller creeks to overflow and minor flooding along the Belle Fourche River.
Read the full account →Moisture and instability ahead of an upper level low allowed for afternoon thunderstorms to develop across portions of central and northern Wyoming. Many of the storms were moving south to north within the counter-clockwise rotation of the low.
Read the full account →The warmest temperatures of the summer season produced snowmelt runoff in the drainages of the western Bighorn Mountains. Creeks and streams in Big Horn and Washakie counties quickly rose in response to the increased runoff. The flooding subsided during the morning of July 1.
Read the full account →A storm that developed northwest of Dubois traveled along the Wind River Valley and walloped central Fremont County with hail and heavy rain. Hail up to several inches deep accumulated on U.S. Highway 26 northwest of Riverton near Kinnear.
Read the full account →The first extended warm spell of the season produced an active period of snowmelt from an historic snowpack in the western Bighorn Mountains. As a result, waterways in and near the foothills of the Bighorn Mountains rose rapidly causing flooding in Big Horn and Washakie counties.
Read the full account →Heavy rain fell in association with a strong thunderstorm that tracked south along the western edge of the Medicine Lodge State Archaeological Site. The rain fell on already saturated soils and quickly gathered in dry washes and arroyos west of the site.
Read the full account →An intense supercell thunderstorm originated near Chugwater, Wyoming, during the early to mid afternoon hours on 6/20, tracking across southern Platte and Goshen counties through approximately 3:00 PM MDT before moving into the western Nebraska Panhandle.
Read the full account →Water levels continued to rise on the Wind River into early July in response to rapid late-season snowmelt and increased releases from a reservoir. The flood waters reached record levels at Kinnear and Riverton and came very close at Dubois and Crowheart.
Read the full account →Monsoon moisture streamed north into Sweetwater County initiating thunderstorms which produced intense rainfall east of Rock Springs. Rainfall of around one inch fell in less than one hour in a small drainage north of Interstate 80.
Read the full account →Heavy rain fell across northeastern Wyoming as a strong storm system crossed the region. Two to five inches of rain in 36 hours caused significant runoff and flooding in the Gillette area. The Little Powder River and Donkey Creek rose above bankfull.
Read the full account →Deep moisture and a passing shortwave combined to produce to slow moving strong to severe thunderstorms across Natrona County. The most notable storm occurred in northern Natrona County to the south of Midwest.
Read the full account →Deep moisture and a passing shortwave combined to produce to slow moving strong to severe thunderstorms across Natrona County. The most notable storm occurred in northern Natrona County to the south of Midwest.
Read the full account →Showers and thunderstorms initially developed over the higher terrain of the Laramie Range late in the afternoon on 6/21, rapidly increasing in both coverage and intensity as they tracked slowly eastward through the evening.
Read the full account →Showers and thunderstorms initially developed over the higher terrain of the Laramie Range late in the afternoon on 6/21, rapidly increasing in both coverage and intensity as they tracked slowly eastward through the evening.
Read the full account →Rapid melt of a strong late season snowpack resulted in high water levels along many rivers and streams in Sublette County. Certain sections of the Green and New Fork rivers flooded lowlands and in some cases necessitated the sandbagging of homes.
Read the full account →A slow-moving thunderstorm developed over the Teton Range and produced heavy rain along an axis parallel to and over Paintbrush Canyon. Rainfall amounts of one-half inch to one inch fell in 20 to 30 minutes in the steep-sided canyon.
Read the full account →A second severe thunderstorm developed in the Echeta area and tracked slowly north-northeast across northern Campbell County. The storm produced quarter size hail from Echeta to south and east of Recluse.
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