Time: 900 AM Sat September 30, 2023 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- WARMER & BREEZY TODAY WITH A VERY SLIGHT CHANCE FOR A FEW HIGH-BASED SHOWES/ISOLATED THUNDERSTORMS THIS AFTERNOON & EARLY EVE This weekend kicks off the beginning of a cooling trend for the Front Range Urban Corridor as we start to move into October. Partly to mostly cloudy skies this afternoon, as high temperatures reach the mid to upper 80s. A relatively weak cold front will pass through Colorado this afternoon bringing breezy conditions across the District with gusts up to 40mph. This cold front will also bring a very slight chance for a few high-based showers/isolated thunderstorms with continued gusty conditions this afternoon and tonight. If a stronger thunderstorm forms, there will be a low chance of it becoming severe, mainly for gusty winds up to 60mph and favoring areas east of I-25. Initial storm development will start along the higher terrain foothills and along the Palmer Divide just after midday. The best chance for shower activity inside the District will be from 2-9pm with skies gradually clearing through the overnight. Typical showers will only be between a trace and 0.10”, however, isolated higher amounts will be possible if stronger storms are able to develop. Overnight lows will drop into the low to mid 50s on the plains with mid to upper 40s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers or a weak thunderstorm could produce a trace-0.10” total in 10-30 minutes. A moderate shower/isolated thunderstorm could produce 0.10-0.30” total in 10-30 minutes. WORST CASE SCENARIO: A strong thunderstorm, or training of moderate thunderstorms has the potential to produce up to 0.60” in under 60 minutes. A LOOK AHEAD: Not much change to the overall pattern tomorrow as gusty southerly winds continues over the region, up to 40mph in the afternoon. High temperatures will be slightly cooler in the low 80s with dry conditions expected throughout the day. Today is the final day for weather coverage from Skyview Weather. Thank you for another great, record breaking season! Any questions or comments should be directed to Bruce Rindahl at 303-455-6277 or Bruce Rindahl brindahl(a)mhfd.org. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Arapahoe 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Boulder 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Broomfield 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Denver 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Douglas 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Jefferson 300 PM TO 900 PM Trace (20%) to 0.1" (10%) to 0.3" (5%) NONE Foothills above 6500ft       Boulder 200 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE Douglas 200 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE Jefferson 200 PM TO 800 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) 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]