Time: 855 PM Mon August 19, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 9:30 PM Message 1’s will be allowed to expire at 9:30pm as the threat of heavy rainfall has come to an end. A couple of rounds of moderate to heavy showers impacted portions of the District this afternoon and early evening. Shower and thunderstorm activity has since moved eastward and out of the District. A few showers and isolated thunderstorms persist for areas north of the District and should remain north as they continue to move eastward. A very slight chance for a few showers to make it into northern portions of the District bringing minimal additional rainfall. Temperatures overnight will decrease into the low 60s for the plains with mid to upper 50s along the foothills. Drier conditions move into the region tomorrow, keeping only a slight chance for a few late evening showers and possibly a thunderstorm or two. High temperatures tomorrow will also increase, likely jumping back into the 90s. STORM RAINFALL POTENTIAL AND DURATION: A weak shower will produce a trace to 0.10” total in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong shower/thunderstorm will have the potential to produce 0.10-0.30” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 930 PM Current TO 900 PM Jefferson County 1 Current TO 930 PM Current TO 900 PM Broomfield County 1 Current TO 930 PM Current TO 900 PM Douglas County 1 Current TO 930 PM Current TO 900 PM Adams County 1 Current TO 930 PM Current TO 900 PM Denver County 1 Current TO 930 PM Current TO 900 PM DIA 1 Current TO 930 PM Current TO 900 PM Arapahoe County 1 Current TO 930 PM Current TO 900 PM the City of Aurora 1 Current TO 930 PM Current TO 900 PM Arvada 1 Current TO 930 PM Current TO 900 PM Wheat Ridge 1 Current TO 930 PM Current TO 900 PM Lakewood 1 Current TO 930 PM Current TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Arapahoe Current TO 1159 PM MON Trace (15%) to 0.1" (10%) to 0.3" (5%) NONE Boulder Current TO 1159 PM MON Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Broomfield Current TO 1159 PM MON Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Denver Current TO 1159 PM MON Trace (15%) to 0.1" (10%) to 0.3" (5%) NONE Douglas Current TO 1159 PM MON Trace (10%) to 0.1" (5%) to 0.3" (0%) NONE Jefferson Current TO 1159 PM MON Trace (10%) to 0.1" (5%) to 0.3" (0%) NONE Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Douglas Current TO 1159 PM MON Trace (10%) to 0.1" (5%) to 0.3" (0%) NONE Jefferson Current TO 1159 PM MON Trace (10%) to 0.1" (5%) to 0.3" (0%) 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]