Flash Flood Prediction Program

Time: 825 PM Thu May 25, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 9:30 PM Message 1’s will be allowed to expire as the threat for heavy rainfall has ended for the day. Thunderstorm activity has moved east of the District and with cooling temperatures no additional thunderstorms are expected this evening. Generally dry conditions will persist into Friday morning for many areas but an isolated rain shower cannot be completely ruled out over the next few hours with completely dry conditions ahead of midnight. Any additional shower activity will favor the foothills. Surface moisture will remain in place tomorrow and another round of afternoon thunderstorms are expected with stronger storms capable of producing brief heavy rainfall and large hail. STORM RAINFALL POTENTIAL AND DURATION: Most areas will trend on the dry side with isolated rain showers producing a trace to 0.1” of rain. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 230 PM TO 930 PM 330 PM TO 830 PM Jefferson County 1 230 PM TO 930 PM 330 PM TO 830 PM Broomfield County 1 230 PM TO 930 PM 330 PM TO 830 PM Douglas County 1 230 PM TO 930 PM 330 PM TO 830 PM Adams County 1 230 PM TO 930 PM 330 PM TO 830 PM Denver County 1 230 PM TO 930 PM 330 PM TO 830 PM DIA 1 230 PM TO 930 PM 330 PM TO 830 PM Arapahoe County 1 230 PM TO 930 PM 330 PM TO 830 PM the City of Aurora 1 230 PM TO 930 PM 330 PM TO 830 PM Arvada 1 230 PM TO 930 PM 330 PM TO 830 PM Wheat Ridge 1 230 PM TO 930 PM 330 PM TO 830 PM Lakewood 1 230 PM TO 930 PM 330 PM TO 830 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM THU Trace (15%) to 0.05" (10%) to 0.1" (5%) ISSUED Arapahoe Current TO 1100 PM THU Trace (15%) to 0.05" (10%) to 0.1" (5%) ISSUED Boulder Current TO 1100 PM THU Trace (20%) to 0.05" (10%) to 0.1" (5%) ISSUED Broomfield Current TO 1100 PM THU Trace (15%) to 0.05" (10%) to 0.1" (5%) ISSUED Denver Current TO 1100 PM THU Trace (15%) to 0.05" (10%) to 0.1" (5%) ISSUED Douglas Current TO 1100 PM THU Trace (20%) to 0.05" (10%) to 0.1" (5%) ISSUED Jefferson Current TO 1100 PM THU Trace (20%) to 0.05" (10%) to 0.1" (5%) ISSUED Foothills above 6500ft       Boulder Current TO 1100 PM THU Trace (30%) to 0.05" (15%) to 0.1" (5%) ISSUED Douglas Current TO 1100 PM THU Trace (30%) to 0.05" (15%) to 0.1" (5%) ISSUED Jefferson Current TO 1100 PM THU Trace (30%) to 0.05" (15%) to 0.1" (5%) 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]