Time: 410 PM Wed May 24, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S CONTINUE VALID/CHANCES FOR THUNDERSTORMS DIMINISHING Message 1’s continue valid until 8:00pm but the threat for thunderstorms has greatly diminished behind the initial round of strong storms. Cooler temperatures in the 50’s to lower 60’s are responsible for a much lower thunderstorm threat as the atmosphere has stabilized. Additional rain showers may re-develop into the evening, but the thunderstorm threat is very low, however, should a thunderstorm be able to develop brief heavy rainfall is possible as moisture levels remain high. Message 1’s are expected to be allowed to expire at 8:00pm this evening. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1” of rain. Weak to moderate thunderstorms will have the potential to produce 0.1-0.4” in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm is able to develop in a cool air mass with the potential to produce 0.4-1.2” in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Jefferson County 1 1200 PM TO 800 PM 100 PM TO 700 PM Boulder County 1 1200 PM TO 800 PM 100 PM TO 700 PM the City of Aurora 1 1200 PM TO 800 PM 100 PM TO 700 PM Arapahoe County 1 1200 PM TO 800 PM 100 PM TO 700 PM DIA 1 1200 PM TO 800 PM 100 PM TO 700 PM Denver County 1 1200 PM TO 800 PM 100 PM TO 700 PM Adams County 1 1200 PM TO 800 PM 100 PM TO 700 PM Douglas County 1 1200 PM TO 800 PM 100 PM TO 700 PM Broomfield County 1 1200 PM TO 800 PM 100 PM TO 700 PM Lakewood 1 1200 PM TO 800 PM 100 PM TO 700 PM Wheat Ridge 1 1200 PM TO 800 PM 100 PM TO 700 PM Arvada 1 1200 PM TO 800 PM 100 PM TO 700 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Arapahoe Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Boulder Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Broomfield Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Denver Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Douglas Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Jefferson Current TO 800 PM WED 0.01" (50%) to 0.2" (25%) to 0.4" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 800 PM WED 0.01" (60%) to 0.2" (30%) to 0.4" (15%) ISSUED Douglas Current TO 800 PM WED 0.01" (60%) to 0.2" (30%) to 0.4" (15%) ISSUED Jefferson Current TO 800 PM WED 0.01" (60%) to 0.2" (30%) to 0.4" (15%) 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]