Time: 1002 AM Wed September 4, 2024 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Cooler Temperatures with Thunderstorms today and tonight An upper-level disturbance and its associated cold front will sweep across the region today, bringing cooler temperatures and a more active pattern today and tomorrow. High temperatures will be in the mid 80s, with dewpoints around 50°F and precipitable water (PWAT) values around 0.85”. Storm motions will be from west to east around 20-25 mph. Chances for showers and thunderstorms will improve gradually throughout the day as the front approaches. Storms will likely continue this evening with lingering isolated showers possible overnight. STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms today have the potential to produce between a 0.25-0.75” in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm, or thunderstorm clusters, have the potential to produce up to 1.50” 60 minutes or less. A LOOK AHEAD: A few isolated showers may linger across the District tomorrow morning. Currently, precipitation tomorrow morning should remain relatively light and is not expected to pose any flooding risks. Chances for storms will gradually decline throughout the day tomorrow as the system moves east. Skies will clear overnight. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Arapahoe 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Boulder 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Broomfield 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Denver 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Douglas 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Jefferson 200 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Foothills above 6500ft       Boulder 100 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Douglas 100 PM TO 1100 PM 0.25" (75%) to 0.5" (50%) to 0.75" (25%) MOD Jefferson 100 PM TO 1100 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]