Flash Flood Prediction Program

-	NW flow aloft and a passing upper level jet streak will help to support stronger storms over portions of the District this afternoon and early evening. Temperatures today will be in the mid 80's to around 90 on the plains with low to mid 70's along the foothills. Dew points on the plains will remain in the mid 40's to around 50, with low to mid 40's in the foothills.
-	Best chances for stronger thunderstorms today will be E of I-25 where moisture is a bit deeper. Thunderstorms will be fast moving from NW to SE between 10-20mph. The fast storm motions will help to limit point rainfall amounts from a single storm, although a slower moving storm formed along an outflow boundary cannot be completely ruled out today. Strong thunderstorms may also produce large hail, gusty straight-line winds and frequent lightning.
-	Shower and thunderstorm activity is expected to decrease by sunset with skies gradually clearing through the overnight. Low temperatures overnight will drop into the upper 50's to low 60's across the plains with low to mid 50's in the foothills.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak to moderate thunderstorms will produce a trace to 0.3". Moderate to strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 mintues. Supplemental QPF is available at https://qpf.udfcd.org

WORST CASE SCENARIO: A large slower moving thunderstorm or training of thunderstorm cells may produce rainfall amounts of up to 1.6" in 45-60 minutes.

A LOOK AHEAD: NW flow will continue to dominate over the region through Friday resulting in chances for afternoon/early evening rain/isolated thunderstorm chances through the week. Westerly upper-level flow moves in Friday bringing drier conditions into the weekend.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	200 PM TO 900 PM	Trace (70%) to 0.3" (30%) to 0.8" (10%)	LOW
Arapahoe	200 PM TO 900 PM	Trace (70%) to 0.3" (30%) to 0.8" (10%)	LOW
Boulder	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW
Broomfield	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW
Denver	200 PM TO 900 PM	Trace (60%) to 0.3" (30%) to 0.8" (10%)	LOW
Douglas	200 PM TO 900 PM	Trace (70%) to 0.3" (30%) to 0.8" (10%)	LOW
Jefferson	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW
Foothills above 6500ft
Boulder	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW
Douglas	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW
Jefferson	200 PM TO 900 PM	Trace (50%) to 0.3" (20%) to 0.8" (5%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.