Flash Flood Prediction Program

Time: 723 PM Fri September 3, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 8:00 PM - Message 1's will be allowed to expire at 8pm as the threat for heavy rainfall has come to an end. - Most areas will remain dry through the rest of the evening, however, a few widely scattered light to brief moderate isolated rain showers cannot be completely ruled out over the next few hours. These rain showers will favor northeastern and southeastern portions of the District as the tail end of the disturbance exits the region through the evening. - By 10pm skies will gradually clear with a mild overnight as lows drop into the mid to upper 50's for the plains with low 50's along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce a trace to 0.1" in 10-30 minutes. A brief moderate rain showers could produce 0.1-0.3" in 10-30 minutes. WORST CASE SCENARIO: A thunderstorm has the potential to produce 0.3-0.8" in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 800 PM Current TO 800 PM Adams County 1 Current TO 800 PM Current TO 800 PM Douglas County 1 Current TO 800 PM Current TO 800 PM Broomfield County 1 Current TO 800 PM Current TO 800 PM Jefferson County 1 Current TO 800 PM Current TO 800 PM Boulder County 1 Current TO 800 PM Current TO 800 PM Lakewood 1 Current TO 800 PM Current TO 800 PM Wheat Ridge 1 Current TO 800 PM Current TO 800 PM Arvada 1 Current TO 800 PM Current TO 800 PM the City of Aurora 1 Current TO 800 PM Current TO 800 PM Arapahoe County 1 Current TO 800 PM Current TO 800 PM DIA 1 Current TO 800 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Arapahoe Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Boulder Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Broomfield Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Denver Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Douglas Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Jefferson Current TO 1000 PM FRI Trace (20%) to 0.1" (15%) to 0.3" (5%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM FRI Trace (30%) to 0.1" (15%) to 0.3" (5%) ISSUED Douglas Current TO 1000 PM FRI Trace (30%) to 0.1" (15%) to 0.3" (5%) ISSUED Jefferson Current TO 1000 PM FRI Trace (30%) to 0.1" (15%) to 0.3" (5%) 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]