Time: 623 PM Mon August 28, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL CONTINUE VALID UNTIL 10:00 PM Message 1’s will continue valid until 10:00pm as the threat of heavy rainfall continues. So far, most areas in the District have remained dry as suppressed temperatures resulted in little to no storm development. Another line of showers/isolated thunderstorms is moving into the District from the NW and will move SE through the District over the next few hours. A gust front from stronger storms NE is accompanying this line and could trigger some stronger storms as they move through the District. The best chance for storms will be from now through 10pm with a few lingering isolated light showers favoring SE portions of the District. Overnight will clear out with lows dropping into the 60s. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce rainfall of 0.05" to 0.25” total in 10-30 minutes. Moderate to strong showers have the potential to produce rainfall of 0.25 to 0.75” total in 10-30 minutes. WORST CASE SCENARIO: Strong stationery, or training of thunderstorms has the potential to produce 0.75” to 1.50” in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 1100 PM Current TO 1030 PM DIA 1 Current TO 1100 PM Current TO 1030 PM Arapahoe County 1 Current TO 1100 PM Current TO 1030 PM Adams County 1 Current TO 1100 PM Current TO 1030 PM Douglas County 1 Current TO 1100 PM Current TO 1030 PM Broomfield County 1 Current TO 1100 PM Current TO 1030 PM Jefferson County 1 Current TO 1100 PM Current TO 1030 PM Boulder County 1 Current TO 1100 PM Current TO 1030 PM the City of Aurora 1 Current TO 1100 PM Current TO 1030 PM Arvada 1 Current TO 1100 PM Current TO 1030 PM Wheat Ridge 1 Current TO 1100 PM Current TO 1030 PM Lakewood 1 Current TO 1100 PM Current TO 1030 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Arapahoe Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Boulder Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Broomfield Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Denver Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Douglas Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Jefferson Current TO 1000 PM MON 0.05" (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM MON 0.05" (80%) to 0.25" (60%) to 0.75" (30%) ISSUED Douglas Current TO 1000 PM MON 0.05" (80%) to 0.25" (60%) to 0.75" (30%) ISSUED Jefferson Current TO 1000 PM MON 0.05" (80%) to 0.25" (60%) to 0.75" (30%) 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]