Time: 825 AM Mon July 10, 2023 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- EVEN WARMER TODAY WITH A FEW HIGH-BASED AFTERNOON SHOWERS/ISOLATED THUNDERSTORMS High-pressure starts to build over the region today leading to more seasonable high temperatures this afternoon with highs reaching the low 90’s in some spots. A chance for showers/isolated thunderstorms this afternoon, with prime time between 1-7pm. Storm motions should be relatively quick, between 10-20mph which will help limit point rainfall amounts if good showers/thunderstorms are able to develop. Generally, storms will be high-based today, bringing minimal rainfall. However, if surface dew points stay elevated through the afternoon there will be a slightly better chance for storm development, especially areas east of I-25. Skies will clear this evening with mild conditions through the overnight. Overnight lows will drop into the low 60’s on the plains with mid to upper 50’s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers will produce a TR-0.10” total, in 10-30 minutes. A weak thunderstorm could produce 0.10-0.30” total in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong thunderstorm is able to develop, will have the potential to produce up to 0.6” in under 60 minutes. A LOOK AHEAD: High-pressure really takes hold tomorrow, bringing mild and dry conditions throughout the day. High temperatures will reach the low to mid 90’s in the afternoon tomorrow. Similar conditions Wednesday with highs in the low 90’s with continued mild and dry conditions. Not much change to start the day Thursday, with high temperatures once again reaching the 90’s. A slight chance Thursday afternoon for another round of high-based showers/isolated thunderstorms with minimal impacts for the District. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams 100 PM TO 700 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE Arapahoe 100 PM TO 700 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE Boulder 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Broomfield 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Denver 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Douglas 100 PM TO 700 PM Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE Jefferson 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Foothills above 6500ft       Boulder 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Douglas 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE Jefferson 100 PM TO 700 PM Trace (30%) to 0.1" (15%) to 0.3" (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]