M-1 Street Flooding Potential

Time: 243 PM Mon September 29, 2025 Forecaster: James Miezejeski ------------------------- MESSAGE 1 Flash Flood Prediction Program ------------------------- STREET FLOODING POTENTIAL 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) including: LAKEWOOD, WHEAT RIDGE, ARVADA, THE CITY OF AURORA, DIA ------------------------------------------------------------------------------ from: Current to 1000 PM . Prime time for flooding: Current to 900 PM . ------------------------------------------------------------------------------ Forecast rainfall: Typical showers and weak thunderstorms will produce a 0.05"-0.25” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.25”-0.75” total in 10-30 minutes. An anchored moderate to strong shower/thunderstorm, or training of moderate showers/thunderstorms will have the potential to produce up to 1.50" 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: Strong thunderstorms may also contain 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]