Time: 426 PM Mon June 28, 2021 Forecaster: Brad Simmons ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S CONTINUE VALID FOR PORTIONS OF THE DISTRICT - Message 1's continue valid for Adams, Arapahoe, Denver, Douglas and Jefferson Counties until 8pm this evening, however the threat for heavy rainfall is diminishing. - A gust front moved through the District from NW to SE and generated a few isolated thunderstorms over eastern areas of the District but did not produce much additional activity. Now that this gust front has moved through we are lacking a trigger for new storms and the threat for thunderstorms is lowering with temperatures in the 60's to lower 70's over the plains. - A weak wave to the N may still be able to produce weak to moderate thunderstorm activity later this afternoon and early evening as it moves into the District. STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.2" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce 0.2-0.6" in 10-30 minutes. WORST CASE SCENARIO: A large or slower moving thunderstorm may result in up to 1.2" of rain in 45-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Jefferson County 1 Current TO 800 PM 245 PM TO 600 PM Douglas County 1 Current TO 800 PM 245 PM TO 700 PM Adams County 1 Current TO 800 PM 245 PM TO 700 PM Denver County 1 Current TO 800 PM 245 PM TO 700 PM DIA 1 Current TO 800 PM 245 PM TO 700 PM Arapahoe County 1 Current TO 800 PM 245 PM TO 700 PM the City of Aurora 1 Current TO 800 PM 245 PM TO 700 PM Arvada 1 Current TO 800 PM 245 PM TO 700 PM Wheat Ridge 1 Current TO 800 PM 245 PM TO 700 PM Lakewood 1 Current TO 800 PM 245 PM TO 700 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Arapahoe Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Boulder Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) LOW Broomfield Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) LOW Denver Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Douglas Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Jefferson Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Foothills above 6500ft       Boulder Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) LOW Douglas Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) ISSUED Jefferson Current TO 800 PM MON Trace (60%) to 0.2" (30%) to 0.6" (10%) 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]