Time: 114 PM Fri June 30, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL CONTINUE VALID UNTIL 6 PM Message 1’s will continue to be valid until 6pm as the threat of heavy rainfall remains over the District. An early morning round of showers/thunderstorms moved over the District and has continued eastward at this time. Another round of showers/thunderstorms is moving in from the W/NW and will likely impact the District over the next several hours. Cooler temperatures behind the line of storms this morning could help limit the strength of storms into the afternoon. Although with some elevated spots of higher dew points, combined with the approaching upper-level disturbance, the threat of heavy rainfall will remain into the early evening hours. A slight chance storms linger past 6pm, however, drier air will start to push into the region this evening which could help limit rainfall potential into the evening. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated thunderstorms will produce 0.20-0.40” total, in 10-30 minutes. A moderate to heavy thunderstorm could produce 0.40-1.20” total, in 10-30 minutes. WORST CASE SCENARIO: A stationary strong thunderstorm, or training of thunderstorm cells has the potential to produce 2.00” in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 600 PM Current TO 530 PM Jefferson County 1 Current TO 600 PM Current TO 530 PM Broomfield County 1 Current TO 600 PM Current TO 530 PM Douglas County 1 Current TO 600 PM Current TO 530 PM Adams County 1 Current TO 600 PM Current TO 530 PM Denver County 1 Current TO 600 PM Current TO 530 PM DIA 1 Current TO 600 PM Current TO 530 PM Arapahoe County 1 Current TO 600 PM Current TO 530 PM the City of Aurora 1 Current TO 600 PM Current TO 530 PM Arvada 1 Current TO 600 PM Current TO 530 PM Wheat Ridge 1 Current TO 600 PM Current TO 530 PM Lakewood 1 Current TO 600 PM Current TO 530 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Arapahoe Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Boulder Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Broomfield Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Denver Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Douglas Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Jefferson Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Douglas Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) ISSUED Jefferson Current TO 600 PM FRI 0.2" (80%) to 0.4" (40%) to 1.2" (20%) 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]