Flash Flood Prediction Program

Time: 203 PM Sat July 3, 2021 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT - Message 1's have been issued for the entire District and will be valid until 8:30pm this evening. - Thunderstorms have developed to the NW of the District and will be moving into the District shortly. These storms appear to be associated with a weak boundary moving southward that will pass through the District this afternoon and may be a focus for slower moving thunderstorms. - Thunderstorms that develop today are not expected to be as strong as previous days but will continue to have the potential to produce heavy rainfall that may lead to excessive runoff and possibly flash flooding. Best chances for storms will be through 7:30pm. STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce 0.3-0.9" in 10-30 minutes. WORST CASE SCENARIO: A stationary strong thunderstorm may result in up to 1.8" in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 830 PM 300 PM TO 730 PM DIA 1 Current TO 830 PM 300 PM TO 730 PM Arapahoe County 1 Current TO 830 PM 300 PM TO 730 PM the City of Aurora 1 Current TO 830 PM 300 PM TO 730 PM Arvada 1 Current TO 830 PM 300 PM TO 730 PM Adams County 1 Current TO 830 PM 300 PM TO 730 PM Douglas County 1 Current TO 830 PM 300 PM TO 730 PM Broomfield County 1 Current TO 830 PM 230 PM TO 730 PM Jefferson County 1 Current TO 830 PM 300 PM TO 730 PM Boulder County 1 Current TO 830 PM Current TO 730 PM Wheat Ridge 1 Current TO 830 PM 300 PM TO 730 PM Lakewood 1 Current TO 830 PM 300 PM TO 730 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Arapahoe Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Boulder Current TO 830 PM SAT 0.1" (85%) to 0.3" (50%) to 0.9" (15%) ISSUED Broomfield Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Denver Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Douglas Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Jefferson Current TO 830 PM SAT 0.1" (65%) to 0.3" (30%) to 0.9" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 830 PM SAT 0.1" (100%) to 0.3" (60%) to 0.9" (15%) ISSUED Douglas Current TO 830 PM SAT 0.1" (85%) to 0.3" (50%) to 0.9" (15%) ISSUED Jefferson Current TO 830 PM SAT 0.1" (85%) to 0.3" (50%) to 0.9" (15%) 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]