Time: 926 AM Sat July 27, 2024 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Another chance for isolated afternoon and early evening showers and thunderstorms A minimal change to the upper-level flow aloft will keep chances for afternoon storm activity across portions of the District. Today’s high temperatures will reach the low 90s in the afternoon under partly cloudy skies. Showers and thunderstorms are expected to develop along the higher terrain foothills by midday with showers/thunderstorms moving into the District between 1-2pm. A few elevated dew points remain for northern portions of the District which will keep a chance for some brief moderate to heavy rainfall today. The largest threat today will be a quick 0.50” in 10-15 minutes rather than any long-lasting rainfall. Once again, general storm motions will be from west to east between 10-15mph with a few erratic storms possible forming along outflow boundaries. The best chance for storms within the District will be between 2-8pm with a few lingering showers possible after sunset with skies clearing out by midnight. Overnight will be mild and dry as temperatures drop into the low 60s on the plains with mid to upper 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce 0.05”-0.30” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.30”-0.60” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce 1.20” total in 30-60 minutes. A LOOK AHEAD: The heat returns tomorrow as high temperatures jump back into the mid to upper 90s. A slight chance for scattered high-based showers, mainly along the foothills in the afternoon and early evening with minimal, if any precipitation expected. Hot and dry Monday & Tuesday with highs in the upper 90s under sunny skies. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Arapahoe 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Boulder 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Broomfield 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Denver 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Douglas 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Jefferson 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Foothills above 6500ft       Boulder 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) LOW Douglas 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) LOW Jefferson 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) 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]