M-2 Flash Flood Watch

Time: 1037 AM Thu July 28, 2022 Forecaster: Justin Brooks ------------------------- MESSAGE 2 Flash Flood Prediction Program ------------------------- FLASH FLOOD WATCH The National Weather Service has issued a FLASH FLOOD WATCH for: the following counties: BOULDER (CITY OF BOULDER AFFECTED, FOUR MILE BURN AREA AFFECTED), JEFFERSON, BROOMFIELD including: ------------------------------------------------------------------------------ from: 1100 AM to 1000 PM . THE NATIONAL WEATHER SERVICE IN BOULDER HAS ISSUED A FLASH FLOOD WATCH FOR THE HIGHER TERRAIN OF BOULDER COUNTY ABOVE 6,000FT FROM 11:00 AM UNTIL 10:00 PM. THE NWS HAS ISSUED AN AREAL FLOOD WATCH FOR BOULDER, BROOMFIELD AND JEFFERSON COUNTIES FROM 11:00 AM TO 10:00 PM AND IMPLIES FLASH FLOODING, THUS MESSAGE 2'S WILL SUPERSEDE THE MESSAGE 1'S FOR BOULDER, BROOMFIELD AND JEFFERSON COUNTIES AND WILL GO INTO EFFECT AT 11:00 AM. THE MESSAGE 2'S FROM THE MHFD WILL COINCIDE WITH MESSAGE 1'S FOR THE REMAINDER OF THE DISTRICT AND MAY BE EXTENDED UNTIL MIDNIGHT IF A FLOODING THREAT REMAINS. Prime time for flooding: 1100 AM to 1000 PM . ------------------------------------------------------------------------------ Forecast rainfall: Moderate to strong thunderstorms will have the potential to produce heavy rainfall rates of 1.0-2.0" in 10-30 minutes. A nearly stationary thunderstorm or large thunderstorm complex may produce up to 3.0" of heavy rain in 45-75 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 roadways is likely to develop over the District this afternoon with Flash flooding of watercourses possible today should a stronger thunderstorm be observed. Although NWS Flood/Flash Flood Watches are not in effect for the remainder of the District the threat is elevated area wide. A Flash Flood Watch means that flash flooding is possible within the watch area. 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]