We have determined that street and small stream flooding is possible in the following counties: Broomfield, Jefferson, Boulder (City of Boulder affected)
including: Lakewood, Wheat Ridge, Arvada from: 200 PM to 900 PM.
Prime time for flooding: 200 PM to 800 PM. Forecast rainfall: Weak to moderate thunderstorms will produce rainfall rates of 0.3-0.8” total in 10-30 minutes. Strong to severe thunderstorms will have the potential to produce rainfall rates of 0.8-1.5” total of rain in 10-30 minutes. A slow-moving strong thunderstorm or a large thunderstorm complex may result in up to 3.0” of rain in 60-90 minutes. The most likely areas to be impacted by flooding are:

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

Additional Information: Strong thunderstorms may also contain large hail, gusty winds, and frequent cloud-to-ground lightning. Excessive runoff and flooding of small streams and low-lying areas may occur.

This Message 1 is to include the threat of heavy rain for the Boulder suburbs, western Broomfield and the Jefferson County suburbs in conjunction with the Flood Watch for the remainder of the District.

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.