We have determined that street and small stream flooding is possible in the following counties: Arapahoe, Denver, Adams, Douglas, Broomfield, Jefferson, Boulder (City of Boulder affected, Four Mile Burn Area affected)
including: DIA, the City of Aurora, Arvada, Wheat Ridge, Lakewood from: 200 PM to 1159 PM.
Prime time for flooding: 300 PM to 1100 PM. Forecast rainfall: Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.5-1.5" in 10-30 minutes. A slower moving thunderstorm or briefly anchored thunderstorm may result in up to 2.6" of heavy rainfall in 45-75 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 large hail, gusty winds and frequent cloud-to-ground lightning.

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.