Flash Flood Prediction Program

Time: 952 PM Tue August 3, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 10:00 PM - Message 1's will be allowed to expire at 10pm as the threat for heavy rainfall has come to an end. A few lingering rain showers continue to move off the foothills and onto the plains and will continue to do so over the next few hours. - Typical rain showers at this time will move from NW to SE between 5-15mph and produce between TR-0.2" of rainfall in 10-30 minutes with a few small pockets of moderate rain showers that could produce 0.2-0.5" in 45-60 minutes. Best chance for rain showers will be from now until midnight with a few lingering off and on light to moderate rain showers possible after midnight and through daybreak Wednesday. - Temperatures are currently in the mid 60's to around 70 out at DIA. Temperatures will continue to decrease through the overnight with lows dropping into the mid 50s to low 60's on the plains with low to mid 50's along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce TR-0.2" in 10-30 minutes. A moderate rain showers or weak thunderstorms could produce 0.2-0.5" in 45-60 minutes. WORST CASE SCENARIO: A moderate to strong thunderstorm, or training of rain showers has the potential to produce 1.5" in 60-90 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Boulder County 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (15%) ISSUED Arapahoe Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (15%) ISSUED Boulder Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (25%) ISSUED Broomfield Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (20%) ISSUED Denver Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (20%) ISSUED Douglas Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (20%) ISSUED Jefferson Current TO 700 AM WED Trace (75%) to 0.2" (50%) to 0.5" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 700 AM WED Trace (90%) to 0.2" (60%) to 0.5" (30%) ISSUED Douglas Current TO 700 AM WED Trace (90%) to 0.2" (60%) to 0.5" (30%) ISSUED Jefferson Current TO 700 AM WED Trace (90%) to 0.2" (60%) to 0.5" (30%) 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]