Time: 155 AM Thu July 28, 2022 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S HAVE BEEN EXTENDED UNTIL 4:00 AM - Message 1's have been extended until 4:00 AM as additional thunderstorms lurk N of the District and may impact areas of the District into the pre-dawn hours. These weak to moderate thunderstorms may not translate southward into the District and weaken on approach but the threat remains. - The strength of the storms should they survive into the District will likely be more weak to moderate but even moderate thunderstorms will have the potential to produce brief heavy rainfall as the atmosphere is loaded with moisture. The threat for heavy rainfall is lower than earlier this evening but cannot be ruled out. - Showers and thunderstorms will move from N to S to NW to SE at around 20mph. Storm motions have increased from earlier this evening and faster storm motions will help to limit point rainfall amounts from a single storm keeping any heavy rainfall brief. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.3" in 10-30 minutes. Moderate thunderstorms will have the potential to produce rainfall rates of 0.3-0.9" in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm will be capable of producing rainfall rates of 0.5-1.5" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 400 AM Current TO 330 AM Jefferson County 1 Current TO 400 AM Current TO 330 AM Broomfield County 1 Current TO 400 AM Current TO 330 AM Douglas County 1 Current TO 400 AM Current TO 330 AM Adams County 1 Current TO 400 AM Current TO 330 AM Denver County 1 Current TO 400 AM Current TO 330 AM DIA 1 Current TO 400 AM Current TO 330 AM Arapahoe County 1 Current TO 400 AM Current TO 330 AM the City of Aurora 1 Current TO 400 AM Current TO 330 AM Arvada 1 Current TO 400 AM Current TO 330 AM Wheat Ridge 1 Current TO 400 AM Current TO 330 AM Lakewood 1 Current TO 400 AM Current TO 330 AM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 400 AM THU 0.1" (80%) to 0.3" (60%) to 0.9" (15%) ISSUED Arapahoe Current TO 400 AM THU 0.1" (60%) to 0.3" (40%) to 0.9" (10%) ISSUED Boulder Current TO 400 AM THU 0.1" (75%) to 0.3" (50%) to 0.9" (15%) ISSUED Broomfield Current TO 400 AM THU 0.1" (75%) to 0.3" (50%) to 0.9" (15%) ISSUED Denver Current TO 400 AM THU 0.1" (75%) to 0.3" (50%) to 0.9" (15%) ISSUED Douglas Current TO 400 AM THU 0.1" (50%) to 0.3" (25%) to 0.9" (10%) ISSUED Jefferson Current TO 400 AM THU 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 400 AM THU 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Douglas Current TO 400 AM THU 0.1" (60%) to 0.3" (30%) to 0.9" (15%) ISSUED Jefferson Current TO 400 AM THU 0.1" (60%) to 0.3" (30%) to 0.9" (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]