Flash Flood Prediction Program

Time: 519 PM Sun July 21, 2024 Forecaster: Aaron O ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S CONTINUE VALID UNTIL 10:00 PM Message 1’s will continue to be valid until 10pm as the chance of heavy rainfall remains. After a round of moderate to strong showers and thunderstorms for portions of the District, a few lingering showers persist toward the north. These showers may move into the District over the next few hours bringing some additional rainfall. Temperatures have decreased behind the first round of showers, however, dew points have increased into the mid 50s for some areas in the District. These dew points would result in efficient rain producing showers into the evening with the possibility of a shower or two strengthening into a thunderstorm which will have good potential for moderate to heavy rainfall. Later this evening, a very slight chance for a few lingering showers after 10pm with skies gradually clearing through the overnight. Temperatures overnight will drop into the mid to upper 50s for the plains with low 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce a trace-0.25” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.25-0.50” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce up to 1.00” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Boulder County 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM SUN Trace (50%) to 0.25" (30%) to 0.5" (20%) ISSUED Arapahoe Current TO 1000 PM SUN Trace (50%) to 0.25" (30%) to 0.5" (20%) ISSUED Boulder Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Broomfield Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Denver Current TO 1000 PM SUN Trace (50%) to 0.25" (30%) to 0.5" (20%) ISSUED Douglas Current TO 1000 PM SUN Trace (50%) to 0.25" (30%) to 0.5" (20%) ISSUED Jefferson Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Douglas Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) to 0.5" (10%) ISSUED Jefferson Current TO 1000 PM SUN Trace (40%) to 0.25" (20%) 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]