Time: 506 PM Sun August 27, 2023 Forecaster: Justin Brooks ------------------------- MESSAGE 1 Flash Flood Prediction Program ------------------------- **** LOW IMPACT FLOODING **** PRIORITY DISSEMINATION RECOMMENDED We have determined that low impact flooding is likely in BOULDER COUNTY (CITY OF BOULDER AFFECTED, FOUR MILE BURN AREA NOT AFFECTED) including: ------------------------------------------------------------------------------ from: Current to 630 PM . Prime time for flooding: Current to 600 PM . ------------------------------------------------------------------------------ Forecast rainfall: Strong thunderstorms will have the potential to produce rainfall rates of 0.30-0.75” of rain in 10-30 minutes. A slow moving large thunderstorm or training of strong thunderstorm cells may result in up to 1.50" of rain in under 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: Excessive runoff is imminent or already occurring in Boulder County. Strong thunderstorms may also contain large hail, 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. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]