Hail in Boulder County, Colorado
Hail June 25, 2021 · Boulder County, Colorado
Where the report was made, with tornadoes recorded within 15 miles over the years.
The wider storm
Heavy rainfall associated with a thunderstorm in the Cameron Peak burn area, produced flash flooding in Masonville. Heavy rainfall, up to one inch in an hour, produced flash flooding along Buckhorn Road, south of Big Bear Road. Running water, up to 6 inches deep, covered the roadway. Heavy rain also produced minor flooding in the East Troublesome burn area. Runoff from that storm impacted a small section of Trail Ridge Road along Onahu Creek. A swath of black water, approximately 100 yards wide and 5 inches deep, inundated the roadway briefly and lasted only about 5 minutes. Trail Ridge Road was closed temporarily to clear away the mud. There were some minor mud and flooding issues on Green Mountain Trail too. Finally, a severe thunderstorm produced hail up to quarter size in southwest Boulder.
Began near Boulder (40.0400, -105.3200).
Source: NOAA Storm Events Database, event 968506. Narratives are written by the National Weather Service forecast office that issued the report.
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