Time: 1136 PM Wed September 4, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGES WILL BE EXTENDED UNTIL 3:00 AM Another round of moderate showers/thunderstorms is approaching over western portion of the District at this time and will result in Messages to once again be extended until 3:00 AM. Storms are starting to decrease in strength; however a couple of areas have produced between 0.50-0.75” in 10-20 minutes just west of the District boundary. The threat will remain for brief moderate to heavy rainfall over the next few hours. The largest threat will be a quick 0.50-0.75” in 10-20 minutes, rather than any long-lasting rainfall. A chance for off and on light showers will remain through daybreak, although the threat of any moderate to heavy rainfall should come to an end over the few hours. 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 300 AM THURSDAY Current TO 230 AM THURSDAY Jefferson County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Broomfield County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Douglas County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Adams County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Denver County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY DIA 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Arapahoe County 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY the City of Aurora 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Arvada 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Wheat Ridge 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY Lakewood 1 Current TO 300 AM THURSDAY Current TO 230 AM THURSDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Arapahoe Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Boulder Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Broomfield Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Denver Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Douglas Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Jefferson Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Douglas Current TO 300 AM THU Trace (80%) to 0.25" (40%) to 0.75" (20%) ISSUED Jefferson Current TO 300 AM THU 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]