Flash Flood Prediction Program

High-pressure ridging continues over the Intermountain West today ahead of an upper-level disturbance arriving along the High Plains by midafternoon. This morning will be dry followed by afternoon temperatures in the low to mid 70s.

Chances for showers and thunderstorms improve around midafternoon as daytime heating erodes the stable layer while dewpoints climb into the upper 30s to low 40s. With upper-level flow out of the south-southwest, storms are expected to favor south to north trajectories. The best chances for precipitation activity will be between 3PM and 9PM across the District broadly.

STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated thunderstorms will produce a TR-0.20” in 10-30 minutes. A moderate rain showers/isolated thunderstorm could produce 0.10-0.30” in 10-30 minutes.

WORST CASE SCENARIO: An anchored rain shower/isolated thunderstorm, or training of rain showers, has the potential to produce 0.20-0.50” in 45-60 minutes.

A LOOK AHEAD: An active week weather wise to start the season, however the threat of heavy rainfall should remain minimal at this time. The spring pattern is expected to continue Wednesday with another round of mid-afternoon to early evening showers and thunderstorms. These chances remain through the rest of the week with rain/thunderstorm chances both Thursday and Friday.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Arapahoe	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Boulder	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Broomfield	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Denver	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Douglas	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Jefferson	300 PM TO 900 PM	Trace (50%) to 0.1" (25%) to 0.2" (10%)	NONE
Foothills above 6500ft
Boulder	200 PM TO 1000 PM	Trace (60%) to 0.1" (40%) to 0.2" (20%)	NONE
Douglas	200 PM TO 1000 PM	Trace (60%) to 0.1" (40%) to 0.2" (20%)	NONE
Jefferson	200 PM TO 1000 PM	Trace (60%) to 0.1" (40%) to 0.2" (20%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.