Time: 542 PM Wed August 2, 2023 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL CONTINUE VALID UNTIL 9:00 PM Message 1’s will continue to be valid as the threat of heavy rainfall continues. Thunderstorms began forming along a boundary near the southern portions of the District earlier this afternoon, but dissipated before producing significant rainfall. Dewpoints remain elevated in the low to mid 50s with temperatures climbing into the mid 80s. Currently, an outflow boundary is slowly approaching the District from the northeast, and has the potential to provide enough low level forcing to initiate thunderstorms into the evening. STORM RAINFALL POTENTIAL AND DURATION: Typical showers/thunderstorms will produce a trace to 0.25” total in 10 to 30 minutes. A moderate thunderstorm will produce 0.25” to 0.50” total in 10 to 30 minutes. A strong thunderstorm will produce 0.50” to 0.75” total in 10 to 30 minutes. WORST CASE SCENARIO: An anchored strong thunderstorm or training of thunderstorm cells has the potential to produce up to 1.50” in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Lakewood 1 Current TO 900 PM Current TO 830 PM Wheat Ridge 1 Current TO 900 PM Current TO 830 PM Arvada 1 Current TO 900 PM Current TO 830 PM the City of Aurora 1 Current TO 900 PM Current TO 830 PM Arapahoe County 1 Current TO 900 PM Current TO 830 PM DIA 1 Current TO 900 PM Current TO 830 PM Denver County 1 Current TO 900 PM Current TO 830 PM Adams County 1 Current TO 900 PM Current TO 830 PM Douglas County 1 Current TO 900 PM Current TO 830 PM Broomfield County 1 Current TO 900 PM Current TO 830 PM Jefferson County 1 Current TO 900 PM Current TO 830 PM Boulder County 1 Current TO 900 PM Current TO 830 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Arapahoe Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Boulder Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Broomfield Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Denver Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Douglas Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Jefferson Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Douglas Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (10%) ISSUED Jefferson Current TO 900 PM WED 0.25" (50%) to 0.5" (25%) to 0.75" (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]