Time: 1246 PM Wed July 17, 2024 Forecaster: Aaron O ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 8:00 PM Storms have currently developed over the higher elevations, around the Continental Divide, and will move into the District within the next hour or two. Storm motions will be moving WNW to ESE at 10-20 mph, which could either limit or increase point rainfall amounts, depending on their speeds when they move off of the Foothills. Erratic outflows from storms could increase coverage and lower speeds, increasing point rainfall amounts for the District. The biggest threat will be this afternoon and very early evening will be a quick 0.50-0.80” in 10-30 minutes rather than any long lasting rainfall. Storms will continue to impact the region over the next several hours with a few lingering showers in the early evening. Skies will gradually clear by sunset with temperatures dropping into the low 60s in the plains and mid to upper 50s in the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms today will produce 0.25”-0.50” total in 10-30 minutes. A moderate to strong thunderstorm will produce 0.50"-0.80" total in 10-30 minutes. WORST CASE SCENARIO: A slow-moving, strong thunderstorm may be capable of producing up to 1.25” or more in 30 minutes or less. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 100 PM TO 800 PM 200 PM TO 700 PM Arapahoe County 1 100 PM TO 800 PM 200 PM TO 700 PM DIA 1 100 PM TO 800 PM 200 PM TO 700 PM Denver County 1 100 PM TO 800 PM 200 PM TO 700 PM Adams County 1 100 PM TO 800 PM 200 PM TO 700 PM Douglas County 1 100 PM TO 800 PM 200 PM TO 700 PM Broomfield County 1 100 PM TO 800 PM 200 PM TO 700 PM Jefferson County 1 100 PM TO 800 PM 200 PM TO 700 PM Boulder County 1 100 PM TO 800 PM 200 PM TO 700 PM Arvada 1 100 PM TO 800 PM 200 PM TO 700 PM Wheat Ridge 1 100 PM TO 800 PM 200 PM TO 700 PM Lakewood 1 100 PM TO 800 PM 200 PM TO 700 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Arapahoe 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Boulder 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Broomfield 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Denver 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Douglas 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Jefferson 100 PM TO 800 PM 0.25" (60%) to 0.5" (30%) to 0.8" (15%) ISSUED Foothills above 6500ft       Boulder 100 PM TO 800 PM 0.25" (75%) to 0.5" (45%) to 0.8" (25%) ISSUED Douglas 100 PM TO 800 PM 0.25" (75%) to 0.5" (45%) to 0.8" (25%) ISSUED Jefferson 100 PM TO 800 PM 0.25" (75%) to 0.5" (45%) to 0.8" (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]