Time: 1220 PM Fri June 2, 2023 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT Message 1’s have been issued for the entire District and will be valid until 8:00pm this evening. Once again storms have initiated along the higher terrain and are slowly moving onto the plains at this time. Temperatures have remained in the mid to upper 60’s which should help suppress stronger storm development this afternoon. Dew points are currently in the mid to upper 40’s resulting in even moderate thunderstorms to produce heavy rainfall. The best chance for showers and thunderstorms will be from NOW until 8pm with lingering rain showers possible through midnight. Storm motions today will continue from the S/SE to N/NE for the most part, with additional storms likely forming along outflow boundaries. These outflow storms will likely have the highest chance of bringing localized heavy rainfall as the storm movements will be non-existent at times. There could be multiple rounds of storms today, however the initial round should have highest chance for impactful rain showers, with additional rounds likely becoming much weaker into the evening hours. STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce 0.1-0.3” of rain in 10-30 minutes. Strong thunderstorms will have the potential to produce rainfall rates of 0.3-0.7” in 10-30 minutes. WORST CASE SCENARIO: A nearly stationary strong thunderstorm may result in up to 1.4” of rain in 45-75 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 800 PM Current TO 700 PM Jefferson County 1 Current TO 800 PM Current TO 700 PM Broomfield County 1 Current TO 800 PM Current TO 700 PM Douglas County 1 Current TO 800 PM Current TO 700 PM Adams County 1 Current TO 800 PM Current TO 700 PM Denver County 1 Current TO 800 PM Current TO 700 PM DIA 1 Current TO 800 PM Current TO 700 PM Arapahoe County 1 Current TO 800 PM Current TO 700 PM the City of Aurora 1 Current TO 800 PM Current TO 700 PM Arvada 1 Current TO 800 PM Current TO 700 PM Wheat Ridge 1 Current TO 800 PM Current TO 700 PM Lakewood 1 Current TO 800 PM Current TO 700 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Arapahoe Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Boulder Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Broomfield Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Denver Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Douglas Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Jefferson Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Foothills above 6500ft       Boulder Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Douglas Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (20%) ISSUED Jefferson Current TO 800 PM FRI 0.1" (80%) to 0.3" (40%) to 0.7" (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]