Time: 844 PM Sat August 14, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR PORTIONS OF THE DISRICT - Message 1's have been issued for all areas of the District EXCEPT Boulder, Broomfield, Adams Counties and DIA at this time with storms moving south to southeast. - A strong thunderstorm has rapidly developed over SW Denver and is currently producing moderate to isolated heavy rainfall in areas around Lakewood and Englewood at this time. This storm is moving to the south around 10mph and will continue into far Western Arapahoe and Northern Douglas Counties over the next couple of hours. - Best chance for moderate to heavy rainfall will be from now until 11pm with a few lingering rain showers possible through midnight. STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will produce rainfall rates of 0.3-0.8" in 10-30 minutes. WORST CASE SCENARIO: Strong stationary thunderstorms will have the potential to produce heavy rainfall of 1.6" in 45-75 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Arvada 1 Current TO 1100 PM Current TO 1030 PM the City of Aurora 1 Current TO 1100 PM Current TO 1030 PM Arapahoe County 1 Current TO 1100 PM Current TO 1030 PM DIA 1 Current TO 1100 PM Current TO 1030 PM Denver County 1 Current TO 1100 PM Current TO 1030 PM Adams County 1 Current TO 1100 PM Current TO 1030 PM Douglas County 1 Current TO 1100 PM Current TO 1030 PM Jefferson County 1 Current TO 1100 PM Current TO 1030 PM Broomfield County 1 Current TO 1100 PM Current TO 1030 PM Boulder County 1 Current TO 1100 PM Current TO 1030 PM Lakewood 1 Current TO 1100 PM Current TO 1030 PM Wheat Ridge 1 Current TO 1100 PM Current TO 1030 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM SAT Trace (20%) to 0.3" (10%) to 0.8" (5%) NONE Arapahoe Current TO 1100 PM SAT Trace (60%) to 0.3" (40%) to 0.8" (20%) ISSUED Boulder Current TO 1100 PM SAT Trace (20%) to 0.3" (10%) to 0.8" (5%) NONE Broomfield Current TO 1100 PM SAT Trace (20%) to 0.3" (10%) to 0.8" (5%) NONE Denver Current TO 1100 PM SAT Trace (50%) to 0.3" (30%) to 0.8" (10%) ISSUED Douglas Current TO 1100 PM SAT Trace (60%) to 0.3" (40%) to 0.8" (20%) ISSUED Jefferson Current TO 1100 PM SAT Trace (60%) to 0.3" (40%) to 0.8" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 1100 PM SAT Trace (20%) to 0.3" (10%) to 0.8" (5%) NONE Douglas Current TO 1100 PM SAT Trace (60%) to 0.3" (40%) to 0.8" (20%) ISSUED Jefferson Current TO 1100 PM SAT Trace (60%) to 0.3" (40%) to 0.8" (20%) 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]