Flash Flood Prediction Program

Time: 807 PM Fri September 30, 2022 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 9:00 PM/ADDITIONAL SHOWERS TO CONTINUE OVERNIGHT - Message 1's will be allowed to expire at 9:00 PM as the threat for heavy rainfall has ended for the day. - Now that temperatures have cooled into the 50's the threat for thunderstorms has diminished with additional rain showers continuing overnight into early Saturday morning. - Additional rain showers will be light to briefly moderate with best chances through about 2am then only isolated coverage is expected into daybreak Saturday morning. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.3" in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm is able to develop producing rainfall rates of 0.3-0.7" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 900 PM Current TO 800 PM Jefferson County 1 Current TO 900 PM Current TO 800 PM Broomfield County 1 Current TO 900 PM Current TO 800 PM Douglas County 1 Current TO 900 PM Current TO 800 PM Adams County 1 Current TO 900 PM Current TO 800 PM Denver County 1 Current TO 900 PM Current TO 800 PM DIA 1 Current TO 900 PM Current TO 800 PM Arapahoe County 1 Current TO 900 PM Current TO 800 PM the City of Aurora 1 Current TO 900 PM Current TO 800 PM Arvada 1 Current TO 900 PM Current TO 800 PM Wheat Ridge 1 Current TO 900 PM Current TO 800 PM Lakewood 1 Current TO 900 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Arapahoe Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Boulder Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Broomfield Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Denver Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Douglas Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Jefferson Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Foothills above 6500ft       Boulder Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Douglas Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE Jefferson Current TO 400 AM SAT Trace (100%) to 0.1" (80%) to 0.3" (40%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]