The National Weather Service has issued a FLASH FLOOD WATCH for: 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: 600 PM to 900 PM SATURDAY. The National Weather Service in Boulder has issued a Flash Flood Watch for all areas of the District and is valid from 600 PM this evening until 900 PM tomorrow night(7/31/2021).
Prime time for flooding: Current to 900 PM SATURDAY. Forecast rainfall: Moderate to strong thunderstorms will have the potential to produce 0.6-1.8" of heavy rain in 10-30 minutes. A strong slow moving thunderstorm will have the potential to produce up to 3.5" in 45-60 minutes. Storms that persist beyond 60 minutes may produce locally higher amounts. 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, damaging winds and frequent cloud-to-ground lightning.

A Flash Flood Watch means that flash flooding is possible within the watch area.

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.