Flash Flood Prediction Program

Time: 338 PM Sun May 30, 2021 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S CONTINUE VALID FOR THE DISTRICT - Message 1's will continue valid through 11pm as a widespread rain falls over the District. - Rain showers with embedded weak to briefly moderate thunderstorms impacted the District earlier with recent trends showing a decrease in thunderstorm activity and a transition to a soaking stratiform rain. A widespread and fairly steady rain is expected to continue for the next few hours before before becoming more scattered and eventually isolated as the evening progresses. Smaller creeks and streams will be running high into the evening. Cherry Creek in Denver will likely experience bike path inundation at times. - Rainfall rates from non-thunderstorm light to moderate rain showers is currently in the 0.1-0.3"/hr rate. Rainfall rates are expected to remain steady and then slowly taper off this evening. Should a thunderstorm develop it will have the potential to produce brief heavy rainfall. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce rainfall rates of 0.1-0.4"/hr. Weak thunderstorms will have the potential to produce 0.2-0.6" in 10-30 minutes. WORST CASE SCENARIO: Moderate to strong thunderstorms will have the potential to produce 0.4-1.2" in 15-45 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1100 PM Current TO 1000 PM Jefferson County 1 Current TO 1100 PM Current TO 1000 PM Broomfield County 1 Current TO 1100 PM Current TO 1000 PM Douglas County 1 Current TO 1100 PM Current TO 1000 PM Adams County 1 Current TO 1100 PM Current TO 1000 PM Denver County 1 Current TO 1100 PM Current TO 1000 PM DIA 1 Current TO 1100 PM Current TO 1000 PM Arapahoe County 1 Current TO 1100 PM Current TO 1000 PM the City of Aurora 1 Current TO 1100 PM Current TO 1000 PM Arvada 1 Current TO 1100 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1100 PM Current TO 1000 PM Lakewood 1 Current TO 1100 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Arapahoe Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Boulder Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Broomfield Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Denver Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Douglas Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Jefferson Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Douglas Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (25%) ISSUED Jefferson Current TO 1100 PM SUN 0.1" (100%) to 0.3" (75%) to 0.6" (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]