We previously determined that street and small stream flooding is possible in the following counties: Boulder (City of Boulder affected), Jefferson, Broomfield, Douglas, Adams, Denver, Arapahoe
including: DIA, the City of Aurora, Arvada, Wheat Ridge, Lakewood from: Current to 300 AM.
Prime time for flooding: Current to 230 AM. Forecast rainfall: Typical showers and thunderstorms will produce 0.10”-0.40” total in 10-30 minutes. A moderate to strong thunderstorm will produce 0.40”-0.80” total in 10-30 minutes.

An anchored moderate thunderstorm, or training of moderate to strong thunderstorms will have the potential to produce 1.60” in under 60 minutes. The most likely areas to be impacted by flooding are:

X Mountain streams & floodplains; road crossings; canyon roads & highways; recreational trails; adjacent open space areas/campgrounds/parks; fishing access points & stream reaches; buildings near streams; utilities

X Urban streams/gulches; road crossings; recreational trails; adjacent open space areas/campgrounds/parks; floodplain properties; utilities

X Urban streets, intersections, low lying areas, known trouble spots

X Mountain locations subject to mud/rock/debris slide

Additional Information: Strong thunderstorms may also contain hail, gusty winds, and frequent cloud-to-ground lightning. Excessive runoff and flooding of small streams and low-lying areas may occur.

This message is not intended for public dissemination. Please pass this information along to affected emergency response organizations (police, fire, public works, etc.) within your area.

Also, please take appropriate actions to prepare for possible flooding.

Further information will be provided to you as it becomes available.