Flash Flood Prediction Program

Time: 309 PM Fri June 9, 2023 Forecaster: Laura Smith ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN ISSUED FOR THE ENTIRE DISTRICT Message 1’s have been issued for the entire District and will be valid until 8:00 PM this evening. Thunderstorms have developed along a boundary across the district and are slowly moving northeast due to weak upper level steering winds at 10mph or less. The slow motion of these storms may result in extended periods of heavy rainfall supporting excessive runoff and possibly flash flooding. Best chances for thunderstorms will be through 7:00PM with light rain showers possible throughout the early evening. In addition, the ground remains saturated across the District and may not take as much rain as normal to produce runoff. STORM RAINFALL POTENTIAL AND DURATION: Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.3-0.8” in 10-30 minutes. WORST CASE SCENARIO: A slow moving strong thunderstorm or nearly stationary thunderstorm may result in up to 1.4” of rain in 45-60 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 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Arapahoe Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Boulder Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Broomfield Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Denver Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Douglas Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Jefferson Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Douglas Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (25%) ISSUED Jefferson Current TO 800 PM FRI 0.3" (75%) to 0.5" (50%) to 0.8" (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]