Time: 601 PM Fri August 23, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 7:00 PM Message 1’s will be allowed to expire at 7:00pm as the threat of heavy rainfall has come to an end. A round of moderate to heavy showers impacted northern portions of the District this afternoon and have since moved well onto the eastern plains. Breezy and dry conditions are expected through the rest of the evening. A slight chance for an additional round of showers late this evening/overnight, likely bringing minimal additional rainfall across the District. Overnight temperatures will decrease into the low 60s for the plains with mid to upper 50s along the foothills. Slightly drier conditions move into the region tomorrow, however, a continued chance for a few late afternoon and early evening showers/thunderstorms. High temperatures tomorrow will also be similar, in the low 90s. STORM RAINFALL POTENTIAL AND DURATION: A weak to moderate shower will produce a trace to 0.20” total in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong shower/thunderstorm will have the potential to produce 0.20”-0.40” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 700 PM Current TO 630 PM Jefferson County 1 Current TO 700 PM Current TO 630 PM Broomfield County 1 Current TO 700 PM Current TO 630 PM Douglas County 1 Current TO 700 PM Current TO 630 PM Adams County 1 Current TO 700 PM Current TO 630 PM Denver County 1 Current TO 700 PM Current TO 630 PM DIA 1 Current TO 700 PM Current TO 630 PM Arapahoe County 1 Current TO 700 PM Current TO 630 PM the City of Aurora 1 Current TO 700 PM Current TO 630 PM Arvada 1 Current TO 700 PM Current TO 630 PM Wheat Ridge 1 Current TO 700 PM Current TO 630 PM Lakewood 1 Current TO 700 PM Current TO 630 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Arapahoe Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Boulder Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Broomfield Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Denver Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Douglas Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Jefferson Current TO 300 AM SAT Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Foothills above 6500ft       Boulder Current TO 300 AM SAT Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Douglas Current TO 300 AM SAT Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Jefferson Current TO 300 AM SAT Trace (40%) to 0.2" (20%) to 0.4" (10%) 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]