Time: 345 PM Thu July 18, 2024 Forecaster: Aaron O ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVE UNTIL 9:00 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 NW to SE at 15-20 mph, which should limit point rainfall amounts. Stronger storms will produce outflow boundaries and could cause erratic movement, lower speeds, increasing point rainfall amounts for the District. The biggest threat will be this afternoon and early evening will be a quick 0.50-0.60” 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 just after 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 0.20”-0.60” total in 10-30 minutes. A moderate to strong thunderstorm will produce 0.60"-0.90" 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 Arvada 1 400 PM TO 900 PM 500 PM TO 800 PM Wheat Ridge 1 400 PM TO 900 PM 500 PM TO 800 PM Lakewood 1 400 PM TO 900 PM 500 PM TO 800 PM the City of Aurora 1 400 PM TO 900 PM 500 PM TO 800 PM Arapahoe County 1 400 PM TO 900 PM 500 PM TO 800 PM DIA 1 400 PM TO 900 PM 500 PM TO 800 PM Denver County 1 400 PM TO 900 PM 500 PM TO 800 PM Adams County 1 400 PM TO 900 PM 500 PM TO 800 PM Douglas County 1 400 PM TO 900 PM 500 PM TO 800 PM Broomfield County 1 400 PM TO 900 PM 500 PM TO 800 PM Boulder County 1 400 PM TO 900 PM 500 PM TO 800 PM Jefferson County 1 400 PM TO 900 PM 500 PM TO 800 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Arapahoe 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Boulder 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Broomfield 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Denver 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Douglas 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Jefferson 400 PM TO 900 PM 0.2" (60%) to 0.6" (30%) to 0.9" (10%) ISSUED Foothills above 6500ft       Boulder 400 PM TO 900 PM 0.2" (75%) to 0.6" (50%) to 0.9" (20%) ISSUED Douglas 400 PM TO 900 PM 0.2" (75%) to 0.6" (50%) to 0.9" (20%) ISSUED Jefferson 400 PM TO 900 PM 0.2" (75%) to 0.6" (50%) to 0.9" (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]