Flash Flood Prediction Program

Time: 830 PM Sun June 11, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2'S WILL CONTINUE VALID THROUGH 3AM TOMORROW Message 2’s will continue valid as the threat of heavy rainfall remains at this time. Another round of showers is currently moving through the District at this time. After a strong round of thunderstorms for portions of the District this afternoon, these additional showers should remain weaker through the rest of the evening and through the overnight. However, due to excess moisture and good upper-level support still in place, a chance remains for some moderate to brief heavy rain. The biggest threat at this time will be a quick 0.5” in 10 minutes, although training of rain showers could bring extended moderate to brief heavy rainfall at times through the overnight. The best chance for additional rain will be from NOW through midnight with a few lingering showers from midnight through daybreak tomorrow. Overnight lows will drop into the low 50’s on the plains with mid to upper 40’s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce moderate to heavy rainfall of 0.2” to 0.5" total, in 10 to 30 minutes. Strong thunderstorms have the potential to produce moderate to heavy rainfall of 0.5” to 1.2” total, in 10 to 30 minutes. WORST CASE SCENARIO: Trainign or slow-moving thunderstorms have the potential to produce up to 2.0” total in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Lakewood 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Wheat Ridge 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Arvada 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY the City of Aurora 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Arapahoe County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY DIA 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Denver County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Adams County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Douglas County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Broomfield County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Jefferson County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY Boulder County 2 Current TO 300 AM MONDAY Current TO 200 AM MONDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Arapahoe Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Boulder Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Broomfield Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Denver Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Douglas Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Jefferson Current TO 300 AM MON 0.2" (60%) to 0.5" (30%) to 1.2" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 300 AM MON 0.2" (80%) to 0.5" (40%) to 1.2" (20%) ISSUED Douglas Current TO 300 AM MON 0.2" (80%) to 0.5" (40%) to 1.2" (20%) ISSUED Jefferson Current TO 300 AM MON 0.2" (80%) to 0.5" (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]