Time: 359 PM Mon June 12, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2’S WILL CONTINUE VALID THROUGH 11:59PM. Message 2’s will continue valid as the threat of heavy rainfall remains at this time. Widespread heavy, long-lasting rainfall impacted the District today with storms moving well onto the eastern plains at this time. The brunt of the storm action has tapered off, however, a few light lingering showers persist over the District currently and will continue over the next couple of hours. Another surge of showers/thunderstorms will be possible this evening, with an abundance of available moisture, and good upper-level support still in play, even moderate showers will bring heavy rainfall resulting in a chance for heavy rainfall into this evening. The best chance for additional storm activity will be from 6-10pm this evening. Currently temperatures are in the low to mid 50’s across the District, which will help limit the storm strength through midnight. After midnight, a few lingering light showers will be possible, with a slight chance for a few isolated showers through tomorrow morning. Overnight lows will drop to around 50 degrees on the plains with mid 40’s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce rainfall between a 0.1-0.4” total, in 10-30 minutes. Moderate to strong thunderstorms have the potential to produce moderate to heavy rainfall of 0.4” to 1.0" total, in 10-30 minutes. WORST CASE SCENARIO: Trainign or slow-moving thunderstorms have the potential to produce up to 1.8” total in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 2 Current TO 1159 PM Current TO 800 PM Jefferson County 2 Current TO 1159 PM Current TO 800 PM Broomfield County 2 Current TO 1159 PM Current TO 800 PM Douglas County 2 Current TO 1159 PM Current TO 800 PM Adams County 2 Current TO 1159 PM Current TO 800 PM Denver County 2 Current TO 1159 PM Current TO 800 PM DIA 2 Current TO 1159 PM Current TO 800 PM Arapahoe County 2 Current TO 1159 PM Current TO 800 PM the City of Aurora 2 Current TO 1159 PM Current TO 800 PM Arvada 2 Current TO 1159 PM Current TO 800 PM Wheat Ridge 2 Current TO 1159 PM Current TO 800 PM Lakewood 2 Current TO 1159 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON 0.1" (50%) to 0.4" (25%) to 1" (15%) ISSUED Arapahoe Current TO 1159 PM MON 0.1" (50%) to 0.4" (25%) to 1" (15%) ISSUED Boulder Current TO 1159 PM MON 0.1" (50%) to 0.4" (25%) to 1" (15%) ISSUED Broomfield Current TO 1159 PM MON 0.1" (50%) to 0.4" (25%) to 1" (15%) ISSUED Denver Current TO 1159 PM MON 0.1" (50%) to 0.4" (25%) to 1" (15%) ISSUED Douglas Current TO 1159 PM MON 0.1" (60%) to 0.4" (30%) to 1" (20%) ISSUED Jefferson Current TO 1159 PM MON 0.1" (60%) to 0.4" (30%) to 1" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 PM MON 0.1" (75%) to 0.4" (50%) to 1" (25%) ISSUED Douglas Current TO 1159 PM MON 0.1" (75%) to 0.4" (50%) to 1" (25%) ISSUED Jefferson Current TO 1159 PM MON 0.1" (75%) to 0.4" (50%) to 1" (25%) 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]