Flash Flood Prediction Program

-	A cold front is making its way through the region from the northeast this morning which will limit high temperatures today in the low to mid 80's across the District. Currently dew points are in the upper 30's to low 40's as surface moisture increases behind the cold front, expect dew points to reach the upper 40's to low 50's.
-	Thunderstorms will initially develop over the foothills by midday, while the plains should remain capped initially. By early-afternoon, thunderstorm chances will increase over the plains as storms move eastward with a good chance for thunderstorms to become severe bringing large hail, gusty winds and heavy rainfall. In addition, outflow boundaries may set up over portions of the District and act as a focal point for thunderstorm development late into the evening.
-	Storms today will be slow-moving due to weak steering flow, which will result in a threat for heavy rainfall with abundant low level moisture in place. General storm motions will be to the E at 5-10mph, but storms could exhibit weak/erratic movement at times, along with the potential to stall along outflow or wind convergence boundaries. The best chance of thunderstorms will persist into the evening hours, before storm coverage and intensity gradually decreases after sunset.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce rainfall amounts of 0.1-0.5" in 10-30 minutes. Strong thunderstorms will be capable of producing rainfall amounts of 0.5-1.2" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm stalls along a wind convergence boundary and produces heavy rainfall of up to 2.8" in 60-90 minutes.

A LOOK AHEAD: The general pattern will persist into Sunday with cooler temperatures in the low to mid 80's with a good chance for afternoon/evening showers/thunderstorms, although the threat for severe weather will be very low. Continued cool temperatures into Monday with highs expected in the upper 70's to low 80's along with another chance for showers/thunderstorms in the afternoon/evening once again.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (25%)	HIGH
Arapahoe	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (25%)	HIGH
Boulder	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (20%)	HIGH
Broomfield	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (20%)	HIGH
Denver	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (20%)	HIGH
Douglas	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (25%)	HIGH
Jefferson	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (40%) to 1.2" (20%)	HIGH
Foothills above 6500ft
Boulder	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (30%) to 1.2" (20%)	HIGH
Douglas	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (30%) to 1.2" (20%)	HIGH
Jefferson	Current TO 1000 PM SAT	0.1" (90%) to 0.5" (30%) to 1.2" (20%)	HIGH

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.