Time: 510 PM Thu August 22, 2024 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- Messages Issued For The Entire District Messages have been issued for the entire District, effective now until 10:00 PM. Thunderstorms with the potential to produce heavy rainfall are developing across western portions of the District. Surface winds across northeast Colorado are transporting an elevated airmass into the District and will fuel storm development with rainfall favoring areas of the plains and Quarry burn scar over the coming hours. Storm velocity of west to east at 10-15 mph is expected. Optimal Period: Flooding is most likely to occur until 9:00 PM. STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce rainfall of 0.25-0.75" in 15-30 minutes. WORST CASE SCENARIO: A slow-moving thunderstorm or large thunderstorm complex may produce up to 1.25” of rain in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Lakewood 1 Current TO 1000 PM Current TO 900 PM Wheat Ridge 1 Current TO 1000 PM Current TO 900 PM Arvada 1 Current TO 1000 PM Current TO 900 PM the City of Aurora 1 Current TO 1000 PM Current TO 900 PM Arapahoe County 1 Current TO 1000 PM Current TO 900 PM DIA 1 Current TO 1000 PM Current TO 900 PM Denver County 1 Current TO 1000 PM Current TO 900 PM Adams County 1 Current TO 1000 PM Current TO 900 PM Douglas County 1 Current TO 1000 PM Current TO 900 PM Broomfield County 1 Current TO 1000 PM Current TO 900 PM Jefferson County 1 Current TO 1000 PM Current TO 900 PM Boulder County 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 THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Arapahoe Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Boulder Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Broomfield Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Denver Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Douglas Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Jefferson Current TO 1000 PM THU 0.25" (75%) to 0.5" (50%) to 0.75" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Douglas Current TO 1000 PM THU Trace (75%) to 0.25" (50%) to 0.5" (25%) ISSUED Jefferson Current TO 1000 PM THU Trace (75%) to 0.25" (50%) to 0.5" (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]