Time: 343 PM Mon June 10, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 8:30 PM Message 1’s have been issued for the entire District effective until 8:30pm as the threat of heavy rainfall with a slight chance for severe storms, favoring eastern portions of the District. Sever storms may contain large hail up to 1.0” and gusty winds 60+ mph. The best chance for any shower/thunderstorm activity within the District will be between NOW-8:30pm with a few lingering showers possible through 9:00-10:00pm. The best chance for heavy rainfall will be during this initial round of storms, with storm intensities decreasing into the evening hours. Storm motions will be northwest to southeast between 10-20mph which could limit point rainfall amounts. However, outflow boundaries will likely produce some erratic storm movement which will increase chances for brief heavy rainfall. Skies will clear this evening with dry conditions expected through the overnight as temperatures drop into the mid to upper 50s on the plains with upper 40s to around 50 degrees along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and isolated thunderstorms will produce a 0.05-0.40” total in 10-30 minutes. A moderate to strong/severe shower/thunderstorm will produce 0.40-1.20” total in 10-30 minutes. WORST CASE SCENARIO: A strong, stationary thunderstorm, or training of thunderstorm cells will have the potential to produce up to 2.25” total in under 60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 830 PM Current TO 800 PM Jefferson County 1 Current TO 830 PM Current TO 800 PM Broomfield County 1 Current TO 830 PM Current TO 800 PM Douglas County 1 Current TO 830 PM Current TO 800 PM Adams County 1 Current TO 830 PM Current TO 800 PM Denver County 1 Current TO 830 PM Current TO 800 PM DIA 1 Current TO 830 PM Current TO 800 PM Arapahoe County 1 Current TO 830 PM Current TO 800 PM the City of Aurora 1 Current TO 830 PM Current TO 800 PM Arvada 1 Current TO 830 PM Current TO 800 PM Wheat Ridge 1 Current TO 830 PM Current TO 800 PM Lakewood 1 Current TO 830 PM Current TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Arapahoe Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Boulder Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Broomfield Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Denver Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Douglas Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Jefferson Current TO 830 PM MON 0.05" (60%) to 0.4" (30%) to 1.2" (15%) ISSUED Foothills above 6500ft       Boulder Current TO 830 PM MON 0.05" (75%) to 0.4" (50%) to 1.2" (25%) ISSUED Douglas Current TO 830 PM MON 0.05" (75%) to 0.4" (50%) to 1.2" (25%) ISSUED Jefferson Current TO 830 PM MON 0.05" (75%) to 0.4" (50%) to 1.2" (25%) 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]