Time: 732 PM Wed September 4, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGES WILL CONTINUE VALID UNTIL 10:00 PM A gust front is moving in from the north and will have the potential to trigger another round of showers and possibly a thunderstorm or two over the next few hours. Temperatures have decreased this evening in the mid 60s to around 70 degrees which should help limit storm potential. However, elevated dew points in the low 50s, combined with some upper-level support will keep the potential for a few moderate to heavy showers. The largest threat this evening will be a quick 0.5” in 10-20 minutes rather than any long-lasting rainfall. A chance remains for showers to persist into the overnight with some isolated moderate rain could be possible at times. STORM RAINFALL POTENTIAL AND DURATION: Typical showers/thunderstorms will produce a trace-0.25” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.25”-0.75” total in 10-30 minutes. WORST CASE SCENARIO: A stationary moderate to strong thunderstorm or training of thunderstorm cells will have the potential to produce up to 1.25” in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1000 PM Current TO 900 PM Jefferson County 1 Current TO 1000 PM Current TO 900 PM Broomfield County 1 Current TO 1000 PM Current TO 900 PM Douglas County 1 Current TO 1000 PM Current TO 900 PM Adams County 1 Current TO 1000 PM Current TO 900 PM Denver County 1 Current TO 1000 PM Current TO 900 PM DIA 1 Current TO 1000 PM Current TO 900 PM Arapahoe County 1 Current TO 1000 PM Current TO 900 PM the City of Aurora 1 Current TO 1000 PM Current TO 900 PM Arvada 1 Current TO 1000 PM Current TO 900 PM Wheat Ridge 1 Current TO 1000 PM Current TO 900 PM Lakewood 1 Current TO 1000 PM Current TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Arapahoe Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Boulder Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Broomfield Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Denver Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Douglas Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Jefferson Current TO 1000 PM WED Trace (60%) to 0.25" (30%) to 0.75" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM WED Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Douglas Current TO 1000 PM WED Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Jefferson Current TO 1000 PM WED Trace (80%) to 0.25" (40%) to 0.75" (20%) 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]