Time: 920 PM Mon August 28, 2023 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 rain has come to an end. After a couple of strong storms moved on the edges of the District, a few lingering showers remained. These showers will continue to move SE over the next couple of hours before skies clear through the overnight and into Tuesday. Overnight lows will drop into mid to upper 50s. Dry conditions are expected tomorrow with high temperatures in the 80s under mostly sunny skies. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce a trace to 0.20” total, in 10 to 30 minutes. A moderate showers/thunderstorm will produce 0.20” to 0.40” total, in 10 to 30 minutes. WORST CASE SCENARIO: A strong, stalled thunderstorm has the potential to produce 0.40” to 0.80” in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1000 PM Current TO 930 PM Jefferson County 1 Current TO 1000 PM Current TO 930 PM Broomfield County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM Lakewood 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (0%) NONE Arapahoe Current TO 1159 PM MON Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Boulder Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (0%) NONE Broomfield Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (0%) NONE Denver Current TO 1159 PM MON Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Douglas Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (10%) NONE Jefferson Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (0%) NONE Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (0%) NONE Douglas Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (10%) NONE Jefferson Current TO 1159 PM MON Trace (10%) to 0.2" (5%) to 0.4" (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]