Time: 737 PM Tue July 26, 2022 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN EXTENDED UNTIL 2:00 AM WEDNESDAY - Message 1's have been extended until 2:00 AM Wednesday as the threat for heavy rainfall will continue into the overnight period. - A boundary is approaching the District from the E and will increase moisture further from already elevated levels. This boundary may initiate new thunderstorm development this evening. Due to the abundant moisture available thunderstorms will be very capable of producing heavy rainfall. - Even weak to moderate thunderstorms will be capable of producing brief heavy rainfall. Stronger storms will have the potential to produce excessive runoff that may lead flash flooding. Some areas of the District today have already reached or exceeded 0.5-1.0" of rain and it may not take as much rain from subsequent storms to produce excessive runoff. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers and weak thunderstorms will produce a trace to 0.4" of rainfall. Moderate to strong thunderstorms will have the potential to produce rainfall rates of 0.4-1.2" in 10-30 minutes. WORST CASE SCENARIO: A slower moving thunderstorm or briefly anchored thunderstorm may result in up to 2.0" of heavy rainfall in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Broomfield County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Jefferson County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Boulder County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Wheat Ridge 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Arvada 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY the City of Aurora 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Arapahoe County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY DIA 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Denver County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Adams County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Douglas County 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY Lakewood 1 Current TO 200 AM WEDNESDAY Current TO 100 AM WEDNESDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 200 AM WED 0.1" (80%) to 0.4" (60%) to 1.0" (20%) ISSUED Arapahoe Current TO 200 AM WED 0.1" (80%) to 0.4" (60%) to 1.0" (20%) ISSUED Boulder Current TO 200 AM WED 0.1" (60%) to 0.4" (40%) to 1.0" (15%) ISSUED Broomfield Current TO 200 AM WED 0.1" (60%) to 0.4" (40%) to 1.0" (15%) ISSUED Denver Current TO 200 AM WED 0.1" (80%) to 0.4" (60%) to 1.0" (20%) ISSUED Douglas Current TO 200 AM WED 0.1" (75%) to 0.4" (50%) to 1.0" (15%) ISSUED Jefferson Current TO 200 AM WED 0.1" (75%) to 0.4" (50%) to 1.0" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 200 AM WED 0.1" (60%) to 0.4" (40%) to 1.0" (15%) ISSUED Douglas Current TO 200 AM WED 0.1" (60%) to 0.4" (40%) to 1.0" (15%) ISSUED Jefferson Current TO 200 AM WED 0.1" (60%) to 0.4" (40%) to 1.0" (15%) 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]