Flash Flood in Boulder County, Colorado
Flash Flood July 30, 2021 · Boulder County, Colorado
Where the report was made, with tornadoes recorded within 15 miles over the years.
What the National Weather Service wrote
Heavy rain caused localized flash flooding in Erie. Standing water stranded vehicles at the Intersection of Highway 7 and Mountain View Blvd. A couple of basements also flooded.
The wider storm
Flash flooding occurred on Tonahutu Creek. Trees, mud and debris shut down Grand Lake's hydro plant. Approximately 50 downed trees piled up at the plant's head gate and ash and mud filled the ditch leading to another gate. Another flash flood impacted CO-125. Additional flash flooding occurred in the Calwood and Cameron Peak burn areas, where up to 2.5 inches of rain fell in one hour. In Erie, heavy rain anywhere from 3.5 to 4.5 inches, produced flash flooding. Several vehicles were stranded in intersections and had to be rescued. Severe thunderstorms also produced hail up to quarter size in Larimer County.
Began near Lafayette (39.9800, -105.0700).
Source: NOAA Storm Events Database, event 975300. Narratives are written by the National Weather Service forecast office that issued the report.
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