Time: 335 PM Mon July 15, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGES 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL10:00 PM Storms have initiated over the District this afternoon and will continue into the evening hours. A few moderate to heavy showers have already impacted northern portions of the District with additional storms likely for most areas as storms have increased in coverage over the last 20-30 minutes. Initial storm motions were from the west to east around 10mph, however, stronger storms have resulted in several anchored storms which have produced at least 0.30 in around 10 minutes. The biggest threat will be this afternoon and early evening will be a quick 0.50-0.75” in 10-30 minutes. Storms will continue to impact the region over the next several hours with lingering showers possible into the late evening. Storms also contain some hail and frequent cloud-to-ground lightning. Once the initial round of storms moves through the District, storms will dissipate in strength into the later evening with a few scattered showers possible. Skies will gradually clear overnight with temperatures dropping into the mid to upper 50s. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce 0.05-0.30” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.30-0.80” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce up to 1.25” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Broomfield County 1 Current TO 1000 PM Current TO 930 PM Boulder County 1 Current TO 1000 PM Current TO 930 PM Jefferson County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM Lakewood 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Arapahoe Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Boulder Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Broomfield Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Denver Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Douglas Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Jefferson Current TO 1000 PM MON 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM MON 0.05" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED Douglas Current TO 1000 PM MON 0.05" (80%) to 0.3" (40%) to 0.8" (20%) ISSUED Jefferson Current TO 1000 PM MON 0.05" (80%) to 0.3" (40%) to 0.8" (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]