Flash Flood Prediction Program

Time: 1016 PM Sat July 20, 2024 Forecaster: Aaron O ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 11:00 PM Message 1’s will be allowed to expire at 11pm as the threat of heavy rainfall has come to an end. A few lingering showers persist over the District at this time. These showers will continue over the next couple of hours before clearing out through the overnight. Temperatures will drop into the low 60s by daybreak tomorrow for the plains with mid to upper 50s along the foothills. With minimal changes to the upper level flow, moisture, and cooler temperatures overall, storms will likely initiate tomorrow afternoon with a few isolated storms into the evening hours. Storms should be less intense than today due to lower daytime temperatures; however, at least a LOW chance for Messages tomorrow with excess available moisture at the surface. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce a trace-0.10” total in 10-30 minutes. A moderate shower will produce 0.10-0.20” total in 10-30 minutes. WORST CASE SCENARIO: A thunderstorm will have the potential to produce 0.20-0.40” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME the City of Aurora 1 Current TO 1100 PM Current TO 1100 PM Arapahoe County 1 Current TO 1100 PM Current TO 1100 PM DIA 1 Current TO 1100 PM Current TO 1100 PM Denver County 1 Current TO 1100 PM Current TO 1100 PM Adams County 1 Current TO 1100 PM Current TO 1100 PM Douglas County 1 Current TO 1100 PM Current TO 1100 PM Broomfield County 1 Current TO 1100 PM Current TO 1100 PM Jefferson County 1 Current TO 1100 PM Current TO 1100 PM Boulder County 1 Current TO 1100 PM Current TO 1100 PM Arvada 1 Current TO 1100 PM Current TO 1100 PM Wheat Ridge 1 Current TO 1100 PM Current TO 1100 PM Lakewood 1 Current TO 1100 PM Current TO 1100 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Arapahoe Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Boulder Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Broomfield Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Denver Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Jefferson Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Jefferson Current TO 1100 PM SAT Trace (40%) to 0.1" (20%) to 0.2" (10%) 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]