Time: 441 AM Thu June 22, 2023 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- ALL MESSAGES WILL BE ALLOWED TO EXPIRE AT 6:00 AM All Messages will be allowed to expire at 6:00 AM as the threat for heavy rainfall has ended for the time being. A few lingering light rain showers may persist into the mid-morning with possibly a very isolated thunderstorm. Additional rainfall will be minimal through the remainder of the morning, in the TR-0.2” range with temperatures on the cool side, only warming into the 70’s most areas to around 80 at best in areas with more sunshine. This afternoon was previously expected to feature a good chance for thunderstorms but with the storms yesterday afternoon which continued through much of the overnight period, Mother Nature may give us a relative break today. There will still be a good chance for thunderstorms to develop this afternoon, but coverage will likely be widely scattered, and temperatures could remain too cool for stronger storms. However, significant moisture remains in place and thunderstorms that do develop will be very capable of producing heavy rain. Creeks and streams are still running high, and the ground is saturated in many areas resulting in any additional rain today producing rapid runoff and possibly flash flooding. STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.2” in 30-60 minutes. WORST CASE SCENARIO: Should a weak thunderstorm develop it will have the potential to produce 0.2-0.5” in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 600 AM Current TO 500 AM Arapahoe County 1 Current TO 600 AM Current TO 500 AM DIA 1 Current TO 600 AM Current TO 500 AM Denver County 1 Current TO 600 AM Current TO 500 AM Adams County 1 Current TO 600 AM Current TO 500 AM Douglas County 2 Current TO 600 AM Current TO 500 AM Broomfield County 1 Current TO 600 AM Current TO 500 AM Jefferson County 1 Current TO 600 AM Current TO 500 AM Boulder County 1 Current TO 600 AM Current TO 500 AM Arvada 1 Current TO 600 AM Current TO 500 AM Wheat Ridge 1 Current TO 600 AM Current TO 500 AM Lakewood 1 Current TO 600 AM Current TO 500 AM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Arapahoe Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Boulder Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Broomfield Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Denver Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Douglas Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Jefferson Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Douglas Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) NONE Jefferson Current TO 1100 AM THU Trace (60%) to 0.1" (30%) to 0.2" (10%) 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]