We have determined that street and small stream flooding is possible in the following counties: Boulder (City of Boulder affected, Four Mile Burn Area affected), Jefferson, Broomfield, Douglas, Adams, Denver, Arapahoe
including: DIA, the City of Aurora, Arvada, Wheat Ridge, Lakewood from: 200 PM to 800 PM.
Prime time for flooding: 300 PM to 700 PM. Forecast rainfall: Strong thunderstorms will have the potential to produce rainfall amounts of 0.5-1.3" in 10-30 minutes. A large thunderstorm or slower moving thunderstorm may result in up to 2.5" of rainfall in 60 minutes or less. 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

Additional Information: Strong thunderstorms may also contain frequent cloud-to-ground lightning, gusty straight-line winds and large hail.

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.