Flash Flood Prediction Program

Time: 430 PM Fri September 30, 2022 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT - A gust front has initiated strong thunderstorm development for portions of the District. - Moderate to heavy rainfall is likely especially areas east of I25 at this time. Best chance for heavy rain will be from now until 9pm. - Rainfall rates between 0.2-0.4" already occurring with isolated heavier rainfall likely. These storms will continue over the next couple of hours as the move eastward. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated thunderstorms between a trace and 0.30". A moderate to strong thunderstorm could produce 0.30-0.0.60" in 10-30 minutes. WORST CASE SCENARIO: A stronger slow moving thunderstorm has the potential to produce 0.6-1.6" in 45-75 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 900 PM Current TO 800 PM Adams County 1 Current TO 900 PM Current TO 800 PM Douglas County 1 Current TO 900 PM Current TO 800 PM Broomfield County 1 Current TO 900 PM Current TO 800 PM Jefferson County 1 Current TO 900 PM Current TO 800 PM Boulder County 1 Current TO 900 PM Current TO 800 PM DIA 1 Current TO 900 PM Current TO 800 PM Arapahoe County 1 Current TO 900 PM Current TO 800 PM the City of Aurora 1 Current TO 900 PM Current TO 800 PM Arvada 1 Current TO 900 PM Current TO 800 PM Wheat Ridge 1 Current TO 900 PM Current TO 800 PM Lakewood 1 Current TO 900 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Arapahoe Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Boulder Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Broomfield Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Denver Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Douglas Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Jefferson Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Douglas Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) ISSUED Jefferson Current TO 900 PM FRI Trace (75%) to 0.3" (40%) to 0.6" (30%) 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]