Flash Flood Prediction Program

-	NW flow aloft will turn westerly today which will bring in drier air both at the surface and upper-level. This will decrease rain chances across the District today as high temperatures reach the upper 80's to low 90's on the plains with upper 70's to low 80's along the foothills.
-	A weak disturbance will move in this afternoon resulting in a slight chance for a high based rain shower/isolated thunderstorm, with the largest threat being gusty wind and lightning. With westerly upper-level flow and surface dew points dropping into the upper 30's to low 40's today will result in a decreased chance for rainfall, although a brief isolated moderate rain shower cannot be completely ruled out, favoring eastern portions of the District.
-	Best chance for storms today will be from 1-7pm with lingering weak showers possible until sunset before skies clear into the later evening. Overnight lows are expected in the low to upper 60's on the plains, with mid to upper 50's along the foothills.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.2" of rain in 10-30 minutes. A moderate thunderstorm could produce 0.2-0.5" in 10-30 minutes. Supplemental QPF is available at https://qpf.udfcd.org

WORST CASE SCENARIO: A strong, slow moving thunderstorm formed off an outflow boundary has the potential produce up to 1.0" in 30-60 minutes.

A LOOK AHEAD: High-pressure starts to build over the region Friday resulting in generally dry conditions through the weekend. Temperatures will remain in the upper 80's to low 90's through Sunday. A very slight chance Saturday for a brief rain shower/isolated thunderstorms with little to no heavy rain threat at this time.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	100 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.5" (10%)	LOW
Arapahoe	100 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.5" (10%)	LOW
Boulder	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE
Broomfield	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE
Denver	100 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.5" (10%)	LOW
Douglas	100 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.5" (10%)	LOW
Jefferson	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE
Foothills above 6500ft
Boulder	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE
Douglas	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE
Jefferson	100 PM TO 800 PM	Trace (50%) to 0.2" (20%) to 0.5" (5%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.