Flash Flood Prediction Program

An isolated stronger thunderstorm is currently moving over the foothills and should enter the District over the next hour or so. This cell isn’t particularly strong; however, this storm did trigger 0.20" in 5-10 minutes, resulting in an upgrade to a LOW Message potential heading into this evening. Storms have mostly mixed out this afternoon and will likely continue to do so. Although a gust front could produce a stronger storm development withing the District with the potential for some brief isolated heavy rainfall into this evening. Storm chances should taper off by sunset with a few lingering off and on showers possible through 10pm.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers/weak thunderstorms will produce a trace to 0.25” in 10 to 30 minutes. A weak to moderate thunderstorm will produce 0.25 to 0.50” in 10 to 30 minutes.

WORST CASE SCENARIO: A strong thunderstorm has the potential to produce up to 1.00” in under 60 minutes.

A LOOK AHEAD: Conditions will be similar this weekend, with highs in the upper 80s to low 90s and a slight chance for isolated showers and thunderstorms. On Sunday evening, an upper-level disturbance and its associated cold front will bring a chance for scattered showers and storms across the Front Range Urban Corridor.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Arapahoe	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Boulder	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Broomfield	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Denver	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Douglas	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Jefferson	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Foothills above 6500ft
Boulder	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Douglas	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW
Jefferson	Current TO 1000 PM FRI	Trace (50%) to 0.25" (25%) to 0.5" (10%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.