Flash Flood Prediction Program

Time: 914 PM Mon July 15, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 10:00 PM Message 1’s will be allowed to expire at 10pm 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. Minimal change to the upper-level flow tomorrow, combined with an uptick in moisture will result in another chance for widespread showers and thunderstorms across the District with a slight chance for severe weather. Similar timing is expected with storms initiating around midday along the foothills with multiple rounds of storms possible into the late evening hours for the District. 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 Boulder County 1 Current TO 1000 PM Current TO 930 PM Jefferson County 1 Current TO 1000 PM Current TO 930 PM Broomfield County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM Lakewood 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Arapahoe Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Boulder Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Broomfield Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Denver Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Douglas Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Jefferson Current TO 1159 PM MON Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Douglas Current TO 1159 PM MON Trace (50%) to 0.1" (25%) to 0.2" (10%) NONE Jefferson Current TO 1159 PM MON Trace (50%) to 0.1" (25%) 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]