Time: 325 PM Wed June 26, 2024 Forecaster: Aaron O ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 9:00 PM Message 1’s have been issued for the entire District effective until 9:00pm for the threat of heavy rainfall with a slight chance for severe storms across the District this afternoon and evening. Storms have initiated along the higher terrain and are expected to move into the District over the next hour. Storm motions are SW to NE between 15-20 mph which could help with point rainfall amounts with erratic storm movement likely along outflow boundaries leading to a better chance for longer lasting moderate to heavy rainfall. Storms may also contain large hail up to 1.0” and gusty winds up to 60mph. Dew points are also still elevated, in the upper 40s to low 50s and will likely help fuel moderate to heavy rainfall leading to some localized flooding. A couple of rounds of storms will be possibly today, likely decreasing in strength as the evening progresses with off and on showers possible through the overnight. Overnight temperatures will drop to the mid to upper 60s on the plains with upper 50s to low 60s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers/thunderstorms today will produce a trace to 0.25" total in 10-30 minutes. Moderate to strong thunderstorms will produce up to 0.25-0.75” in 10-30 minutes. WORST CASE SCENARIO: Stationary thunderstorms, or training of thunderstorm cells have the potential to produce up to 1.50” in under 30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 900 PM 400 PM TO 800 PM Arapahoe County 1 Current TO 900 PM 400 PM TO 800 PM DIA 1 Current TO 900 PM 400 PM TO 800 PM Denver County 1 Current TO 900 PM 400 PM TO 800 PM Adams County 1 Current TO 900 PM 400 PM TO 800 PM Douglas County 1 Current TO 900 PM 400 PM TO 800 PM Broomfield County 1 Current TO 900 PM 400 PM TO 800 PM Jefferson County 1 Current TO 900 PM 400 PM TO 800 PM Boulder County 1 Current TO 900 PM 400 PM TO 800 PM Arvada 1 Current TO 900 PM 400 PM TO 800 PM Wheat Ridge 1 Current TO 900 PM 400 PM TO 800 PM Lakewood 1 Current TO 900 PM 400 PM TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Arapahoe Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Boulder Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Broomfield Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Denver Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Douglas Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Jefferson Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Foothills above 6500ft       Boulder Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Douglas Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (25%) ISSUED Jefferson Current TO 900 PM WED Trace (75%) to 0.25" (50%) to 0.75" (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]