Time: 243 PM Sun June 6, 2021 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT - Message 1's have been issued for the entire District and will be valid until 9pm. - Thunderstorms are beginning to develop in and around the District currently. A pseudo front moving in from the E/NE will enter the District shortly and is expected to trigger more numerous thunderstorms in the coming hours. Best chances for thunderstorm activity will be through sunset. - Thunderstorms will be slow moving and may remain stationary at times along gust front/outflow boundary interactions. Stronger thunderstorms will be capable of producing brief heavy rainfall and hail. A large, slower moving strong thunderstorm will be capable of producing an extended period of heavy rain that may lead to excessive runoff and possibly flash flooding. STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce 0.1-0.3" of rain. Moderate to strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes. WORST CASE SCENARIO: A large, slow moving thunderstorm will have the potential to produce up to 1.6" in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 900 PM 300 PM TO 800 PM Arvada 1 Current TO 900 PM 300 PM TO 800 PM DIA 1 Current TO 900 PM 300 PM TO 800 PM Arapahoe County 1 Current TO 900 PM 300 PM TO 800 PM the City of Aurora 1 Current TO 900 PM 300 PM TO 800 PM Denver County 1 Current TO 900 PM 300 PM TO 800 PM Adams County 1 Current TO 900 PM 300 PM TO 800 PM Douglas County 1 Current TO 900 PM 300 PM TO 800 PM Broomfield County 1 Current TO 900 PM 300 PM TO 800 PM Jefferson County 1 Current TO 900 PM 300 PM TO 800 PM Wheat Ridge 1 Current TO 900 PM 300 PM TO 800 PM Lakewood 1 Current TO 900 PM 300 PM TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Arapahoe Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Boulder Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Broomfield Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Denver Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Douglas Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Jefferson Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Douglas Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED Jefferson Current TO 900 PM SUN 0.1" (85%) to 0.3" (50%) to 0.8" (25%) ISSUED MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]