Flash Flood Prediction Program

Time: 853 AM Sat August 26, 2023 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS As the upper-level disturbance conditions continue to shift east, the remnants of a tropical system will expand across the state. This wave of moisture will support cooler temperatures and rainy conditions through the weekend. Isolated storm activity is possible across the Plains today with afternoon temperatures in the mid 70s, dew points in the upper 40s to around 50°F. Downsloping winds will help limit storm development on the plains. Storms will travel from west to east around 20-25 mph. Showers and thunderstorms are expected to dissipate this evening. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will be weak, producing rainfall of TR-0.25” total in 10-30 minutes. Stronger storms have the potential to produce rainfall of 0.25” to 0.50” total in 10-30 minutes. WORST CASE SCENARIO: Strong thunderstorms have the potential to produce 0.50” to 0.75” total in 30-60 minutes. A LOOK AHEAD: Another wave of afternoon thunderstorms is possible tomorrow as temperatures warm into the low to mid 80s. There is still some uncertainty about details and timing through the weekend, which will depend on the track of this system. We will continue to monitor conditions as they develop over the coming days. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Arapahoe 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Boulder 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Broomfield 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Denver 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Douglas 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Jefferson 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Foothills above 6500ft       Boulder 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Douglas 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW Jefferson 200 PM TO 1000 PM Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]