148 first-hand accounts of flood events in Wyoming, ranked by impact. Each is a NOAA-written narrative of the moment.
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 →After an exceptionally snowy winter and cool spring, warming temperatures brought rapid snow melt to the Absarokas. In addition, locally heavy rain fell helping speed the melting of snow. As a result, the South Fork of the Shoshone River rose rapidly and flooded.
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 →Thunderstorms dropped very heavy rain over portions of eastern Lincoln County during the late afternoon hours of September 12. Rainfall estimated at around one inch fell in a little less than one hour.
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 →The first extended warm spell of the summer provided an active period of snowmelt in the Wind River Basin. A cool, wet spring and early summer had kept snowpack in the surrounding mountains unseasonably high.
Read the full account →A strained earthen dam became breached water near the Fiddle Back Ranch releasing water as high as eight feet deep. Emergency Management reported the road at the intersection of Dull Center and Lynch Road was washed out as a result.
Read the full account →Several days and nights of warm temperatures allowed much of an unseasonably high late-season snowpack to melt. The resultant water caused flooding along the Little Wind River and Middle Fork of the Popo Agie River.
Read the full account →A line of strong thunderstorms moved west to east across Natrona County between 4:30 p.m. and 6:30 p.m. These storms originated over the Bighorn mountains of Wyoming and rapidly intensified near the Natrona County International Airport, 6 miles west of Casper, where a 54 kt wind…
Read the full account →Thunderstorms producing heavy rain formed northwest of Casper during the late evening. The storms tracked southeast along and south of U.S. Highway 20/26 over areas that had been hard hit by heavy rain over the previous two weeks.
Read the full account →A moist and unstable airmass and an upper level disturbance brought a third straight day of thunderstorms to western and central Wyoming. The strongest thunderstorm formed over the Absaroka Range and become severe as it moved east across the Big Horn Basin and into Johnson…
Read the full account →Heavy rainfall of three-quarters of an inch to around one inch fell in about 20-30 minutes within the Buffalo Creek drainage in the foothills of the southern Bighorn Mountains.
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 stationary thunderstorm brought flash flooding and an estimated 3 inches of rain to Kaycee. Most of the rain fell between midnight and 4 AM MDT. The flooding did damage to 19 trailers and 22 houses.
Read the full account →Heavy rain began falling over the Donkey Creek drainage, just south of Gillette, around 5 pm MST. Rainfall rates over 2 inches per hour were recorded. A National Weather Service spotter recorded a storm total precipitation amount of 7.5 inches during the evening.
Read the full account →Very slow-moving, nearly stationary, thunderstorms developed in northern Natrona County producing torrential rain and large hail. Radar estimated widespread rainfall of 1.5 inches in an hour with a peak of 3 to 3.5 inches.
Read the full account →The high waters at the confluence of the Lamar River and Soda Butte Creek combined to undercut and damage a 200-foot-section of Yellowstone National Park's Northeast Entrance road.
Read the full account →Strong thunderstorms caused flash flooding across portions of southern Park County. The first area of flash flooding and damage was reported near Valley. Heavy rain washed out bridges and portions of gravel roads.
Read the full account →Heavy rainfall on the south side of Green River produced a flash flood. Within 25 minutes, between 1.25 inches and 1.75 inches of rain was measured in this area of town. A fence at the landfill was washed out by a wall of water six feet high.
Read the full account →A line of thunderstorms developed over the southern Big Horn Basin and become severe as they progressed to the northeast. Hail was reported in multiple locations. The largest hail was quarter sized and was observed in Winchester.
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 →Heavy rain the previous week filled the Big Horn River drainage basin with water. At the same time, recent warm temperatures were melting snow in the Greybull River drainage and additional thunderstorms occurred.
Read the full account →Thunderstorms erupted within a moist atmosphere in place over Sublette and Sweetwater counties. The result was heavy rain and eventually flash flooding in the city of Rock Springs in Sweetwater County.
Read the full account →A large upper level low pressure system pushed across the Northern Plains, bringing heavy rain to the Bear Lodge Mountains. Embedded thunderstorms produced additional heavy rain, with four to five inches of rain falling over a 24 hour period.
Read the full account →