Flash Flood Prediction Program

-	A cold front moved through overnight resulting in cooler high temperatures today in the mid to upper 80's on the plains with upper 70's to low 80's along the foothills. Westerly upper-level flow aloft today will bring mostly sunny skies with dry conditions throughout most of the day with a slight chance this afternoon for an isolated high-based rain shower/thunderstorm.
-	Storms will initiate over the higher terrain this afternoon with the best chance for storms over the District between 3-8pm. With the best chance for stronger storm development east of I-25. Rain showers/isolated thunderstorms will move relatively quickly today from the W/SW to E/NE between 10-15mph which will help limit point rainfall amounts. A slower moving storm formed off an outflow boundary cannot be completely ruled out today leading to a better chance for isolated moderate rainfall. A stronger thunderstorms may also produce hail, gusty straight-line winds and frequent lightning.
-	Shower and thunderstorm activity is expected to taper off by sunset, although an additional isolated rain showers and possibly a weak thunderstorm will remain possible until 9pm.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.2". Moderate to strong thunderstorms will have the potential to produce 0.3-0.5" in 10-30 mintues. Supplemental QPF is available at https://qpf.udfcd.org

WORST CASE SCENARIO: A large, slower moving thunderstorm formed off an outflow boundary may produce rainfall amounts of up to 0.8" in 45-60 minutes.

A LOOK AHEAD: High-pressure will start to build over the region tomorrow leading to warmer temperatures through the rest of the week along with mostly dry conditions. A very slight chance Tuesday for isolated rain showers/thunderstorms with conditions drying out for the rest of the week. A change in the weather pattern this weekend which will bring rain chances during the afternoon and evening Friday through Sunday.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (10%)	LOW
Arapahoe	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (10%)	LOW
Boulder	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (5%)	NONE
Broomfield	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (5%)	NONE
Denver	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (10%)	LOW
Douglas	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (10%)	LOW
Jefferson	300 PM TO 800 PM	Trace (40%) to 0.2" (20%) to 0.5" (5%)	NONE
Foothills above 6500ft
Boulder	300 PM TO 800 PM	Trace (30%) to 0.2" (15%) to 0.5" (5%)	NONE
Douglas	300 PM TO 800 PM	Trace (30%) to 0.2" (15%) to 0.5" (5%)	NONE
Jefferson	300 PM TO 800 PM	Trace (30%) to 0.2" (15%) to 0.5" (5%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.