Time: 1119 PM Mon July 31, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2’S WILL BE ALLOWED TO EXPIRE AT 11:59 PM Message 2’s will be allowed to expire at 11:59pm as the threat of heavy rainfall has come to an end. A few lingering showers/isolated thunderstorms surround the District currently, however, storm strengths have diminished at this time and should continue to weaken through the rest of the overnight. The best chance for additional showers/isolated thunderstorms will be from now through 4am. A few lingering showers will be possible through daybreak tomorrow, generally areas east of the District and onto the eastern plains. Lots of moisture hanging around the surface from today’s rainfall will bring a chance for patchy fog tomorrow morning. Skies should clear through the morning with another good chance for heavy rainfall tomorrow from noon to midnight as another Flood Watch will be in effect. Overnight lows will dip into the upper 50’s to low 60’s. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated thunderstorms will produce a TR-0.25” total in 10-30 minutes. A moderate thunderstorm could produce 0.25-0.50” total in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm, or training of moderate thunderstorms has the potential to produce 0.5-1.0” in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 2 Current TO 1159 PM Current TO 1159 PM Jefferson County 2 Current TO 1159 PM Current TO 1159 PM Broomfield County 2 Current TO 1159 PM Current TO 1159 PM Douglas County 2 Current TO 1159 PM Current TO 1159 PM Adams County 2 Current TO 1159 PM Current TO 1159 PM Denver County 2 Current TO 1159 PM Current TO 1159 PM DIA 2 Current TO 1159 PM Current TO 1159 PM Arapahoe County 2 Current TO 1159 PM Current TO 1159 PM the City of Aurora 2 Current TO 1159 PM Current TO 1159 PM Arvada 2 Current TO 1159 PM Current TO 1159 PM Wheat Ridge 2 Current TO 1159 PM Current TO 1159 PM Lakewood 2 Current TO 1159 PM Current TO 1159 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Arapahoe Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Boulder Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Broomfield Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Denver Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Douglas Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Jefferson Current TO 600 AM TUE Trace (60%) to 0.25" (30%) to 0.5" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 600 AM TUE Trace (50%) to 0.25" (25%) to 0.5" (10%) ISSUED Douglas Current TO 600 AM TUE Trace (50%) to 0.25" (25%) to 0.5" (10%) ISSUED Jefferson Current TO 600 AM TUE Trace (50%) to 0.25" (25%) to 0.5" (10%) 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]