We have determined that low impact flooding is likely in the following counties: Boulder (City of Boulder affected, Four Mile Burn Area not affected), Jefferson
including: Arvada
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from: Current to 500 PM.
Prime time for flooding: Current to 430 PM.
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Forecast rainfall: Strong thunderstorms will produce rainfall rates of 0.50-1.00” of rain in 10-30 minutes. A slow moving large thunderstorm or training of strong thunderstorm cells may result in up to 2.00" of rain in under 60 minutes.
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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
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Additional Information: Excessive runoff is imminent or already occurring in Boulder County, Jefferson County, and Arvada. Strong thunderstorms may also contain gusty winds, and 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.