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: Arvada, the City of Aurora, DIA, Wheat Ridge, Lakewood from: Current to 1100 PM.
Prime time for flooding: Current to 1000 PM. Forecast rainfall: Typical thunderstorms have the potential to produce moderate to heavy rainfall of 0.50” to 1.00” in 10-30 minutes. Strong thunderstorms have the potential to produce very heavy rainfall of 1.00” to 1.75” in 10-30 minutes. A stationary, or training of moderate to strong thunderstorms has the potential to produce 2.5" in up to 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 large hail, gusty winds, 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.