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Flash Flood — Sweetwater, WY

Jul 28, 2021

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. At Rock Springs, over two inches of rain fell in under an hour, producing flooding across western portions of the city. Several roads were flooded and were impassable for hours. The force of the flowing water was enough to break basement windows. Numerous houses had up to six feet of water in ba

Source: NOAA National Weather Service Storm Events Database (event 971334). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Sweetwater, WY

This event is one of many recorded floods in Sweetwater County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

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More Flood Stories

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Sweetwater, WY · Jul 7, 2015

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.

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Sweetwater, WY · Aug 17, 2007

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.

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Sweetwater, WY · Jul 6, 2015

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.

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