Time: 855 AM Mon September 4, 2023 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- ANOTHER WARM DAY WITH A VERY SLIGHT CHANCE OF AFTERNOON/EVE SHOWERS & ISOLATED THUNDERSTORMS As yesterday’s disturbance moves off, much drier conditions will be settling in the area for the several days. Today’s high temperatures will be in the upper 80s and lower 90s this afternoon. Winds will be gusty this afternoon, with gusts up to 30mph. A very slight chance of showers/isolated thunderstorms this afternoon, favoring areas north of I-70 at this time. Any shower activity will generally be hit or miss with most areas across the District likely remaining throughout the day and evening. The best chance for any storm activity will be from 1-7pm. Skies will clear through the overnight with lows dropping into the 50s on the plains with upper 40s to low 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and weak thunderstorms will produce rainfall of a trace to 0.20” total in 10-30 minutes. Moderate to strong showers and thunderstorms Will produce rainfall of 0.20” to 0.40” total in 10-30 minutes. WORST CASE SCENARIO: A strong, nearly stationary, or training of showers/thunderstorms has the potential to produce 0.40” to 0.60” in under 60 minutes. A LOOK AHEAD: Conditions start to dry out Tuesday behind a cold front that will drop high temperatures back into the upper 70s to low 80s under partly cloudy skies. Warmer Wednesday with high temperatures in the mid to upper 80s with mostly sunny skies. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 100 PM TO 700 PM Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Arapahoe 100 PM TO 700 PM Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Boulder 100 PM TO 700 PM Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Broomfield 100 PM TO 700 PM Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Denver 100 PM TO 700 PM Trace (15%) to 0.2" (10%) to 0.4" (5%) NONE Douglas 100 PM TO 700 PM Trace (10%) to 0.2" (5%) NONE Jefferson 100 PM TO 700 PM Trace (15%) to 0.2" (10%) to 0.4" (5%) NONE Foothills above 6500ft       Boulder 100 PM TO 700 PM Trace (20%) to 0.2" (10%) to 0.4" (5%) NONE Douglas 100 PM TO 700 PM Trace (10%) to 0.2" (5%) NONE Jefferson 100 PM TO 700 PM Trace (15%) to 0.2" (10%) to 0.4" (5%) 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]