Flash Flood Prediction Program

Time: 926 PM Mon August 5, 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. After a long-lasting round of widespread moderate to heavy rainfall, only a few isolated showers persist over eastern portions of the District. These showers will slowly meander eastward through the rest of the evening with skies gradually clearing behind. A few additional showers may develop late this evening brining, favoring east/southeast portions of the District. Temperatures overnight will decrease into the low to mid 60s for the plains with upper 50s to around 60 degrees along the foothills. Similar conditions will remain in place for tomorrow with another good chance for widespread afternoon and evening showers/thunderstorms. An abundance of available moisture, both aloft and now at the surface will result in moderate to heavy rainfall out of any storms that are able to develop. STORM RAINFALL POTENTIAL AND DURATION: Weakening showers will produce a trace to 0.20” total in 10-30 minutes. WORST CASE SCENARIO: A stronger shower/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 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 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 0.2" (20%) to 0.4" (10%) NONE Arapahoe Current TO 1159 PM MON Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Boulder Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Broomfield Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Denver Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Douglas Current TO 1159 PM MON Trace (40%) to 0.2" (20%) to 0.4" (10%) NONE Jefferson Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Douglas Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) NONE Jefferson Current TO 1159 PM MON Trace (30%) to 0.2" (15%) to 0.4" (5%) 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]