We have determined that street and small stream flooding is possible in the following counties: Arapahoe, Denver, Adams, Jefferson, Broomfield, Douglas, Boulder (City of Boulder affected, Four Mile Burn Area affected)
including: Wheat Ridge, Arvada, the City of Aurora, DIA, Lakewood from: 100 PM to 800 PM.
Prime time for flooding: 130 PM to 700 PM. Forecast rainfall: Typical rain showers/thunderstorms will produce a 0.1-0.4" in 10-30 minutes. A moderate to strong thunderstorm will produce 0.4-1.2" in 10-30 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: A slow moving/stationary strong thunderstorm formed along an outflow boundary could produce up to 2.4" in 45-60 minutes. Storm today have a good potential to become severe with strong winds, large hail and frequent 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.