Time: 927 PM Mon May 17, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1'S WILL BE ALLOWED TO EXPIRE AT 10:00 PM - Message 1's will be allowed to expire at 10:00pm since the threat for heavy rainfall has come to an end. - A few lingering rain showers will be possible over the next couple of hours favoring northern and western portions of the District around Boulder and along the foothills. Typical rain showers will likely produce TR-0.10" of total rainfall, although an isolated moderate rain shower could produce 0.05-0.20" in 10-30 minutes. Partly cloudy skies through the rest of the evening and overnight with lows dropping into the upper 40's on the plains with low 40's along the foothills. Some residual surface moisture, with dewpoints currently hovering around 50, will result in foggy/misty conditions overnight and into tomorrow morning. - Tomorrow will start off partly cloudy and cool with afternoon temperatures reaching the 60's on the plains with upper 50's for the foothills. Rain showers will continue through the overnight out on the southeastern plains with a chance for some shower activity to move back into the District tomorrow morning. At this time, light to moderate rain showers will be expected, although a slower moving moderate shower, or an isolated heavy rain shower will keep a low flood threat for tomorrow. A slight chance for continued rain showers/isolated thunderstorms in the afternoon before skies clear into Tuesday evening. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers could produce a TR-0.10" in 10-30 minutes. WORST CASE SCENARIO: A slower moving rain shower could produce 0.10-0.20" in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON Trace (30%) to 0.1" (10%) to 0.2" (5%) ISSUED Arapahoe Current TO 1159 PM MON Trace (30%) to 0.1" (10%) to 0.2" (5%) ISSUED Boulder Current TO 1159 PM MON Trace (60%) to 0.1" (30%) to 0.2" (15%) ISSUED Broomfield Current TO 1159 PM MON Trace (50%) to 0.1" (20%) to 0.2" (10%) ISSUED Denver Current TO 1159 PM MON Trace (40%) to 0.1" (15%) to 0.2" (10%) ISSUED Douglas Current TO 1159 PM MON Trace (40%) to 0.1" (15%) to 0.2" (10%) ISSUED Jefferson Current TO 1159 PM MON Trace (60%) to 0.1" (30%) to 0.2" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (60%) to 0.1" (50%) to 0.2" (20%) ISSUED Douglas Current TO 1159 PM MON Trace (50%) to 0.1" (40%) to 0.2" (10%) ISSUED Jefferson Current TO 1159 PM MON Trace (50%) to 0.1" (50%) to 0.2" (20%) 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]