Time: 721 PM Thu June 20, 2024 Forecaster: Aaron O'Brien ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S CONTINUE VALID FOR THE DISTRICT Message 1's will continue to be valid until 10:00pm. Several rounds of storms have already moved through the District, but the threat of heavy rainfall remains in place through the evening. Storms have already affected Jefferson County to Downtown Denver and Northeast Adams County between 3:00-6:30pm and have left the District. Even with cooler temperatures, a slight chance of heavy rain remains in place for the District, as another round of storms will be possible this evening. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce a 0.25-0.75” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.75-1.25" 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 1.50-2.00” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME 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 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 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Arapahoe Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Boulder Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Broomfield Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Denver Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Douglas Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Jefferson Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Douglas Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (25%) ISSUED Jefferson Current TO 900 PM THU 0.5" (75%) to 0.75" (50%) to 1.25" (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]