Time: 918 PM Sun July 21, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 10:00 PM Message 1’s will be allowed to expire at 10pm as the threat of heavy rainfall has come to an end. After a couple of rounds of showers and thunderstorms, only a few isolated showers will persist over the District at this time. These showers will slowly taper off from NW to SE over the next couple of hours with skies gradually clearing through the rest of the overnight. Mild and dry conditions are expected overnight and into daybreak tomorrow. Temperatures will drop into the upper 50s for the plains with low 50s along the foothills. Tomorrow will start to dry out across the Front Range with only a few isolated showers and possibly a high-based thunderstorms or two in the late afternoon/early evening. STORM RAINFALL POTENTIAL AND DURATION: Minimal additional precipitation is expected tonight and through the overnight between a trace and 0.10” total in 10-30 minutes. WORST CASE SCENARIO: A stronger shower/thunderstorm develops will have the potential to produce 0.10”-0.25” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) NONE Arapahoe Current TO 1100 PM SUN Trace (20%) to 0.1" (10%) to 0.25" (5%) NONE Boulder Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) NONE Broomfield Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) NONE Denver Current TO 1100 PM SUN Trace (20%) to 0.1" (10%) to 0.25" (5%) NONE Douglas Current TO 1100 PM SUN Trace (20%) to 0.1" (10%) to 0.25" (5%) NONE Jefferson Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) NONE Foothills above 6500ft       Boulder Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) NONE Douglas Current TO 1100 PM SUN Trace (20%) to 0.1" (10%) to 0.25" (5%) NONE Jefferson Current TO 1100 PM SUN Trace (10%) to 0.1" (5%) to 0.25" (0%) 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]