Flash Flood Prediction Program

-	Mid and upper-level moisture increased overnight across NE Colorado, with morning observations now showing precipitable water near 1.0". Low-level moisture return was also impressive, as current dew points are in the mid to upper 50s over the District. Finally, observations show a weak shortwave trough of low pressure tracking E over the Colorado high country.
-	These details support the threat for scattered to numerous showers and thunderstorms this afternoon and evening capable of moderate to heavy rainfall. The only caveat today is the abundance of mid and upper-level cloud cover currently over the plains, which could limit the strength, coverage, and rainfall totals from today's storms.
-	Today's showers and storms will generally track to the E at around 10-15mph, but some storms may move a slower clip. The best chance for a storm over the District will be between about 1:00pm-7:00pm.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate showers and thunderstorms will produce rainfall amounts between 0.10-0.50" in 10-30 minutes. Stronger thunderstorms will be capable of producing rainfall between 0.50-1.30" in 10-30 minutes.

WORST CASE SCENARIO: Daytime heating is able to maximize instability, allowing a strong, slow-moving thunderstorm to produce rainfall up to 3.0" in 90-120 minutes.

A LOOK AHEAD: Little change is expected for Tuesday, as moisture levels remain elevated and an additional disturbance tracks into the Central Rockies. Look for highs in the mid to upper 80s, with scattered showers and thunderstorms capable of moderate to heavy rainfall once again.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	100 PM TO 700 PM	0.1" (90%) to 0.5" (60%) to 1.3" (25%)	HIGH
Arapahoe	100 PM TO 700 PM	0.1" (90%) to 0.5" (60%) to 1.3" (25%)	HIGH
Boulder	100 PM TO 700 PM	0.1" (80%) to 0.5" (40%) to 1.3" (15%)	HIGH
Broomfield	100 PM TO 700 PM	0.1" (80%) to 0.5" (40%) to 1.3" (15%)	HIGH
Denver	100 PM TO 700 PM	0.1" (90%) to 0.5" (50%) to 1.3" (25%)	HIGH
Douglas	100 PM TO 700 PM	0.1" (90%) to 0.5" (50%) to 1.3" (25%)	HIGH
Jefferson	100 PM TO 700 PM	0.1" (80%) to 0.5" (40%) to 1.3" (15%)	HIGH
Foothills above 6500ft
Boulder	1200 PM TO 700 PM	0.1" (90%) to 0.5" (40%) to 1.3" (10%)	MOD
Douglas	1200 PM TO 700 PM	0.1" (90%) to 0.5" (50%) to 1.3" (20%)	HIGH
Jefferson	1200 PM TO 700 PM	0.1" (90%) to 0.5" (40%) to 1.3" (10%)	MOD

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.