Time: 825 PM Sun June 27, 2021 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE, ADDITIONAL RAIN SHOWERS TO CONTINUE INTO THE LATE EVENING - Message 1's will be allowed to expire at 9:00pm as the threat for heavy rainfall from thunderstorms has ended for the day. - A weak disturbance upstream is expected to produce additional widely scattered light rain showers through about midnight, likely favoring areas W of I-25 and over the foothills. Beyond midnight there could be a few lingering, isolated showers that persist into early Monday morning. Showers will move briskly from N to S at around 15mph. Although unlikely, if a weak thunderstorm were to develop it would be capable of producing brief heavy rainfall. - Due to all of the moisture as of late over large areas of the District it may not take much additional rain to produce runoff and smaller creeks and streams may be susceptible to higher flows into the evening. STORM RAINFALL POTENTIAL AND DURATION: Rainfall rates from light rain showers will generally range from a trace to 0.2" in 30-60 minutes with moderate rain showers producing rainfall rates of 0.2-0.5" in 30-60 minutes. WORST CASE SCENARIO: Weak to moderate thunderstorms are able to develop with the potential to produce brief heavy rainfall of 0.3-0.9" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Denver County 1 Current TO 900 PM Current TO 800 PM MONDAY Adams County 1 Current TO 900 PM Current TO 800 PM MONDAY Douglas County 1 Current TO 900 PM Current TO 800 PM MONDAY Broomfield County 1 Current TO 900 PM Current TO 800 PM MONDAY Jefferson County 1 Current TO 900 PM Current TO 800 PM MONDAY Boulder County 1 Current TO 900 PM Current TO 800 PM MONDAY DIA 1 Current TO 900 PM Current TO 800 PM MONDAY Arapahoe County 1 Current TO 900 PM Current TO 800 PM MONDAY the City of Aurora 1 Current TO 900 PM Current TO 800 PM MONDAY Arvada 1 Current TO 900 PM Current TO 800 PM MONDAY Wheat Ridge 1 Current TO 900 PM Current TO 800 PM MONDAY Lakewood 1 Current TO 900 PM Current TO 800 PM MONDAY County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 60-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Arapahoe Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Boulder Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Broomfield Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Denver Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Douglas Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Jefferson Current TO 400 AM MON Trace (75%) to 0.2" (50%) to 0.5" (15%) NONE Foothills above 6500ft       Boulder Current TO 400 AM MON Trace (95%) to 0.2" (60%) to 0.5" (20%) NONE Douglas Current TO 400 AM MON Trace (95%) to 0.2" (60%) to 0.4" (20%) NONE Jefferson Current TO 400 AM MON Trace (95%) to 0.2" (60%) to 0.4" (20%) 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]