Time: 1006 PM Fri August 19, 2022 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN EXTENDED UNTIL 4:00 AM FOR THE ENTIRE DISTRICT - Message 1's have been extended until 4:00 AM tomorrow morning as the threat for heavy rainfall remains. - An outflow boundary from a cell to the south has moved all the way through the District initiating a few isolated rain showers/thunderstorms at this time. These storms have not been exceptionally strong, however, with good upper-level support aloft and dew points in the 50's, even small/weak showers have been efficient rain producers as they quickly pulse up and down. This will result in the largest threat being a quick 0.5" in 10-15 minutes as a storm pulses up and quickly rains itself out. - Best chance for these showers will be from now until 4am. Storms this evening will be very hit and miss as they remain fairly stationary, which has also increased the chance for isolated brief heavy rainfall through the overnight. Skies will gradually clear tomorrow by daybreak with another chance for showers/thunderstorms tomorrow. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce a trace to 0.3" in 10-30 minutes. a moderate to strong rain shower/thunderstorm will produce 0.3-0.6" in 10-30 minutes. WORST CASE SCENARIO: A strong, stationary storm has the potential to produce 0.6-1.8" in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Arvada 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY the City of Aurora 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Arapahoe County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY DIA 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Denver County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Adams County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Douglas County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Broomfield County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Jefferson County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Boulder County 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Wheat Ridge 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY Lakewood 1 Current TO 400 AM SATURDAY Current TO 300 AM SATURDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Arapahoe Current TO 400 AM SAT Trace (40%) to 0.3" (20%) to 0.6" (5%) ISSUED Boulder Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Broomfield Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Denver Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Douglas Current TO 400 AM SAT Trace (40%) to 0.3" (20%) to 0.6" (5%) ISSUED Jefferson Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (10%) ISSUED Douglas Current TO 400 AM SAT Trace (40%) to 0.3" (20%) to 0.6" (5%) ISSUED Jefferson Current TO 400 AM SAT Trace (50%) to 0.3" (25%) to 0.6" (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]