Flash Flood Prediction Program

-	Tail end of an upper level disturbance is expected to graze northern areas of the District this evening. As this disturbance passes between 10pm and 2am there will be a modest chance for showers and thunderstorms, favoring areas N of I-70 with lesser chances southward. Being the furthest north, Boulder County will have the best chances for measurable rain overnight.
-	Showers and thunderstorms will be fast moving from SW to NE at 20-30mph which is expected to keep the flooding threat at bay but a stronger storm may still be capable of producing brief heavy rainfall as surface moisture slowly returns. Fast moving rain showers and weak to briefly moderate thunderstorms are expected to be the main culprits tonight.
-	After 2am any shower and thunderstorm activity is expected to have pushed east of the District with dry conditions for the remainder of the overnight period.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.1" of rain. Weak to moderate thunderstorms will have the potential to produce 0.1-0.4" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm develops with the potential to produce 0.3-0.9" of heavy rainfall in 10-30 minutes.

A LOOK AHEAD: Conditions are trending dry for Friday under sunny to mostly sunny skies with temperatures running above seasonal averages.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	1000 PM TO 200 AM FRI	Trace (60%) to 0.2" (30%) to 0.4" (15%)	LOW
Arapahoe	1000 PM TO 200 AM FRI	Trace (50%) to 0.2" (20%) to 0.4" (10%)	NONE
Boulder	1000 PM TO 200 AM FRI	Trace (90%) to 0.2" (60%) to 0.4" (20%)	LOW
Broomfield	1000 PM TO 200 AM FRI	Trace (80%) to 0.2" (40%) to 0.4" (20%)	LOW
Denver	1000 PM TO 200 AM FRI	Trace (60%) to 0.2" (30%) to 0.4" (10%)	NONE
Douglas	1000 PM TO 200 AM FRI	Trace (40%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	1000 PM TO 200 AM FRI	Trace (80%) to 0.2" (40%) to 0.4" (20%)	LOW
Foothills above 6500ft
Douglas	1000 PM TO 200 AM FRI	Trace (50%) to 0.2" (25%) to 0.4" (10%)	NONE
Jefferson	1000 PM TO 200 AM FRI	Trace (90%) to 0.2" (60%) to 0.4" (30%)	LOW
Boulder	900 PM TO 100 AM FRI	Trace (100%) to 0.2" (70%) to 0.4" (40%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.