Time: 752 PM Wed June 30, 2021 Forecaster: Justin Brooks ------------------------- 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 effective until 10pm this evening. - A few storms initiated off a relatively weak gust front earlier this evening, which have effectively sent additional gust fronts into the District at this time. Currently low to mid 50s dew points across the District, along with the gust front trigger, provided the ingredients needed to get a line of storms to produce from DIA to Aurora at this time. These cells will continue to build over the next hour or so resulting in a chance for heavy rainfall. - Very little to slow moving storm motions will also increase the chance for longer lasting moderate to heavy rainfall over the next couple of hours. Best chance for storms will be until 9pm as additional outflow boundaries will be possible. However, storm intensities should decrease after sunset. Although with adequate moisture in place, typical rain showers could produce moderate to heavy rainfall. 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 large or slower moving thunderstorm may result in up to 1.6" of rain in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 1000 PM Current TO 930 PM Boulder County 1 Current TO 1000 PM Current TO 930 PM Jefferson County 1 Current TO 1000 PM Current TO 930 PM Broomfield County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM Lakewood 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Arapahoe Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Boulder Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Broomfield Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Denver Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Douglas Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Jefferson Current TO 1000 PM WED 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM WED 0.1" (50%) to 0.3" (25%) to 0.9" (5%) ISSUED Douglas Current TO 1000 PM WED 0.1" (50%) to 0.3" (25%) to 0.9" (5%) ISSUED Jefferson Current TO 1000 PM WED 0.1" (50%) to 0.3" (25%) to 0.9" (5%) 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]