Time: 958 AM Fri August 9, 2024 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Scattered to widespread thunderstorms across the District A wave of unsettled weather will continue traversing the Northern Plains today, transporting a broad envelope of Pacific mid-level moisture into Colorado. Coupled with favorable upper-level support, another cool and stormy day is expected. The stratus deck blanketing Northeastern Colorado this morning will remain in place throughout the day, encouraging cooler temperatures in the 70s. Dewpoints will be in the upper 50s to low 60s, and precipitable water (PWAT) values around 1.00”. The right entrance region of the upper-level jet will be over northeast Colorado broadly today, providing sufficient lift for convection initiation. Isolated thunderstorms are expected to develop by the early afternoon over complex terrain, becoming scattered to widespread as outflows propagate convection onto the plains. Storm motions will be from west to east around 25mph. Quick storm motions will help limit point rainfall amounts, but stronger storms will be capable of producing efficient, moderate to briefly heavy rainfall. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms today have the potential to produce between a 0.25-0.50” in 10-30 minutes. Stronger showers and thunderstorms today have the potential to produce between a 0.50-0.75” in 10-30 minutes. WORST CASE SCENARIO: A slow-moving stronger thunderstorm may be capable of producing 1.50” or more in 30 minutes or less. A LOOK AHEAD: Starting tomorrow, cloud cover should start to break up with some drying aloft. Temperatures will be in the 80s with chances for afternoon showers and thunderstorms. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Arapahoe 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Boulder 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Broomfield 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Denver 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Douglas 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Jefferson 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Foothills above 6500ft       Boulder 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Douglas 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Jefferson 1200 PM TO 1000 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789    F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]