Time: 405 PM Tue June 29, 2021 Forecaster: Justin Brooks ------------------------- 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 effective until 9pm. - Slow moving to nearly stationary thunderstorms have pushed a rain cooled outflow boundary eastward and onto the plains. Nearly stationary rain showers and isolated thunderstorms have formed around the Chatfield area and will slowly build outward from this area to the north and east with rain showers to isolated thunderstorms possible throughout the District for the rest of this afternoon and evening. - Moderate to strong thunderstorms will be capable of producing heavy rainfall that may lead to excessive runoff. Best chances for thunderstorms will be over the next 4-5hours. STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.3-0.9" in 10-30 minutes. WORST CASE SCENARIO: A stationary moderate to strong thunderstorm may result in up to 2.5" of rain in 60-90 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Douglas County 1 Current TO 900 PM Current TO 800 PM Adams County 1 Current TO 900 PM Current TO 800 PM Denver County 1 Current TO 900 PM Current TO 800 PM DIA 1 Current TO 900 PM Current TO 800 PM Arapahoe County 1 Current TO 900 PM Current TO 800 PM the City of Aurora 1 Current TO 900 PM Current TO 800 PM Arvada 1 Current TO 900 PM Current TO 800 PM Wheat Ridge 1 Current TO 900 PM Current TO 800 PM Lakewood 1 Current TO 900 PM Current TO 800 PM Broomfield County 1 Current TO 900 PM Current TO 800 PM Jefferson County 1 Current TO 900 PM Current TO 800 PM Boulder County 1 Current TO 900 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM TUE 0.1" (30%) to 0.3" (20%) to 0.9" (5%) ISSUED Arapahoe Current TO 900 PM TUE 0.1" (40%) to 0.3" (30%) to 0.9" (10%) ISSUED Boulder Current TO 900 PM TUE 0.1" (65%) to 0.3" (40%) to 0.9" (20%) ISSUED Broomfield Current TO 900 PM TUE 0.1" (50%) to 0.3" (40%) to 0.9" (10%) ISSUED Denver Current TO 900 PM TUE 0.1" (50%) to 0.3" (40%) to 0.9" (10%) ISSUED Douglas Current TO 900 PM TUE 0.1" (75%) to 0.3" (50%) to 0.9" (25%) ISSUED Jefferson Current TO 900 PM TUE 0.1" (75%) to 0.3" (50%) to 0.9" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM TUE 0.1" (75%) to 0.3" (50%) to 0.9" (25%) ISSUED Douglas Current TO 900 PM TUE 0.1" (75%) to 0.3" (50%) to 0.9" (25%) ISSUED Jefferson Current TO 900 PM TUE 0.1" (75%) to 0.3" (50%) to 0.9" (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]