Flash Flood Prediction Program

Time: 306 PM Wed September 4, 2024 Forecaster: Aaron O'Brien ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 10:00 PM A second wave of storms have started to initiate along the foothills and will start moving into the District over the next hour. Temperatures today reached the low 80s, combined with dew points in the low to mid 40s, storms today could potentially produce light to moderate rainfall. Storm motions will be from west-southwest to east-northeast, generally between 15-20 mph with some possible erratic storm movement possibly along outflow boundaries. One main round of showers and thunderstorms with light to moderate rainfall is expected today, with weaker and isolated storms possible by sundown and into the night. A slight chance for a few overnight showers/thunderstorms as temperatures drop into the low 60s on the plains with mid to upper 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms today have the potential to produce between a 0.25-0.75” in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm, or thunderstorm clusters, have the potential to produce up to 1.25” 60 minutes or less. COUNTY MESSAGE VALID TIMES PRIME TIME 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 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 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Arapahoe Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Boulder Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Broomfield Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Denver Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Douglas Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Jefferson Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Douglas Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (30%) ISSUED Jefferson Current TO 1000 PM WED 0.25" (70%) to 0.5" (50%) to 0.75" (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]