Time: 510 PM Fri June 16, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 2’S CONTINUE VALID UNTIL 10:00 PM Message 2’s (NWS Flood/Flash Flood Watch) will continue valid until 10:00 PM this evening. Temperatures in the 50’s over the District are resulting in more of a widespread non-thunderstorm rain event currently and this trend is expected to continue into the evening. The threat for heavy rainfall from thunderstorms is now lower than earlier today. With a saturated ground in many areas light to moderate rain will continue to accumulate and produce runoff, filling smaller creeks and streams into the evening. The scattered to numerous rain showers will continue likely through 8:00 or 9:00 PM, diminishing from W to E by around 10:00 PM or shortly after. Ahead of midnight dry conditions are expected to develop and continue for the remainder of the overnight period. STORM RAINFALL POTENTIAL AND DURATION: Non-thunderstorm rain showers are producing rainfall rates of 0.1-0.5” in 30-60 minutes. Moderate rain showers may produce up to 1.0” in 45-60 minutes. WORST CASE SCENARIO: Should a thunderstorm develop brief heavy rainfall of 0.5-1.5” in 10-30 minutes is possible. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Jefferson County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Broomfield County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Douglas County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Adams County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Denver County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM DIA 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Arapahoe County 2 1000 AM TO 1000 PM 1200 PM TO 900 PM the City of Aurora 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Arvada 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Wheat Ridge 2 1000 AM TO 1000 PM 1200 PM TO 900 PM Lakewood 2 1000 AM TO 1000 PM 1200 PM TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Arapahoe Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Boulder Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Broomfield Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Denver Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Douglas Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Jefferson Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Douglas Current TO 1000 PM FRI 0.1" (100%) to 0.5" (50%) to 1" (25%) ISSUED Jefferson Current TO 1000 PM FRI 0.1" (100%) to 0.5" (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]