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: Current to 900 PM.
Prime time for flooding: Current to 830 PM. Forecast rainfall: Typical showers/weak thunderstorms will produce a 0.05-0.25” total, in 10-30 minutes. A moderate shower/isolated thunderstorm will produce 0.25-0.75” total in 10-30 minutes. Strong thunderstorms will produce 0.75-1.50” total 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 stronger, stalled out thunderstorm is able to develop and will have the potential to produce up to 2.50” total, in 45-60 minutes.

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.