Flash Flood Prediction Program

Time: 836 PM Sat May 15, 2021 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1s WILL BE ALLOWED TO EXPIRE AT 9:00 PM - Message 1's will be allowed to expire at 9:00pm since the threat for heavy rainfall has come to an end. - A few lingering rain showers will be possible over the next hour favoring southeastern portions of the District. Typical rain showers will likely produce TR-0.10" of total rainfall. 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. Excess surface moisture, with dewpoints currently hovering around 50, will result in foggy conditions this evening and into tomorrow morning. - Tomorrow will start off cloudy and cool with another good chance for afternoon rain/thunderstorms with a slight chance of storms becoming severe. Dew points will rise back into the 50's, along with better upper level support, will bring a good chance for heavy rainfall tomorrow afternoon and 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 DIA 1 Current TO 900 PM Current TO 900 PM Denver County 1 Current TO 900 PM Current TO 900 PM Adams County 1 Current TO 900 PM Current TO 900 PM Douglas County 1 Current TO 900 PM Current TO 900 PM Broomfield County 1 Current TO 900 PM Current TO 900 PM Jefferson County 1 Current TO 900 PM Current TO 900 PM Boulder County 1 Current TO 900 PM Current TO 900 PM Lakewood 1 Current TO 900 PM Current TO 900 PM Wheat Ridge 1 Current TO 900 PM Current TO 900 PM Arvada 1 Current TO 900 PM Current TO 900 PM the City of Aurora 1 Current TO 900 PM Current TO 900 PM Arapahoe County 1 Current TO 900 PM Current TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Arapahoe Current TO 1000 PM SAT Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Boulder Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Broomfield Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Denver Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Douglas Current TO 1000 PM SAT Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE Jefferson Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Foothills above 6500ft       Boulder Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) NONE Douglas Current TO 1000 PM SAT Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE Jefferson Current TO 1000 PM SAT Trace (5%) to 0.1" (0%) to 0.2" (0%) 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]