M-1 Street Flooding Potential Update

Time: 155 AM Thu July 28, 2022 Forecaster: Brad Simmons ------------------------- MESSAGE 1 UPDATE Flash Flood Prediction Program ------------------------- STREET FLOODING POTENTIAL We previously determined that street and small stream flooding is possible in the following counties: BOULDER (CITY OF BOULDER AFFECTED, FOUR MILE BURN AREA AFFECTED), JEFFERSON, BROOMFIELD, DOUGLAS, ADAMS, DENVER, ARAPAHOE including: DIA, THE CITY OF AURORA, ARVADA, WHEAT RIDGE, LAKEWOOD ------------------------------------------------------------------------------ from: Current to 400 AM . Prime time for flooding: Current to 330 AM . ------------------------------------------------------------------------------ Forecast rainfall: Weak to moderate thunderstorms will have the potential to produce rainfall rates of 0.3-0.9" in 10-30 minutes. A strong thunderstorm will have the potential to produce 0.5-1.5" in 10-30 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 ------------------------------------------------------------------------------ Additional Information: Message 1's have been extended until 4:00 AM Thursday for all Counties within the District. 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]