Time: 829 PM Sat August 20, 2022 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE - Message 1's will be allowed to expire at 9:30 PM as the threat for heavy rainfall has ended for the day. - Rain shower activity has tapered off over the past couple hours but a few lingering light showers will continue possible into the evening. Best chances for additional showers will be through about 11:00 PM. After 11:00 PM generally dry conditions are expected for the remainder of the evening and overnight period. - The threat for heavy rainfall from slow moving afternoon thunderstorms will continue on Sunday. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.2" of rain in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 930 PM 330 PM TO 830 PM Jefferson County 1 Current TO 930 PM 330 PM TO 830 PM Broomfield County 1 Current TO 930 PM 330 PM TO 830 PM Douglas County 1 Current TO 930 PM 330 PM TO 830 PM Adams County 1 Current TO 930 PM 330 PM TO 830 PM Denver County 1 Current TO 930 PM 330 PM TO 830 PM DIA 1 Current TO 930 PM 330 PM TO 830 PM Arapahoe County 1 Current TO 930 PM 330 PM TO 830 PM the City of Aurora 1 Current TO 930 PM 330 PM TO 830 PM Arvada 1 Current TO 930 PM 330 PM TO 830 PM Wheat Ridge 1 Current TO 930 PM 330 PM TO 830 PM Lakewood 1 Current TO 930 PM 330 PM TO 830 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Arapahoe Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Boulder Current TO 1100 PM SAT Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Broomfield Current TO 1100 PM SAT Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Denver Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas Current TO 1100 PM SAT Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Jefferson Current TO 1100 PM SAT Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder Current TO 1100 PM SAT Trace (75%) to 0.1" (50%) to 0.2" (15%) NONE Douglas Current TO 1100 PM SAT Trace (75%) to 0.1" (50%) to 0.2" (15%) NONE Jefferson Current TO 1100 PM SAT Trace (75%) to 0.1" (50%) to 0.2" (15%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]