Flash Flood Prediction Program

-	Not much has changed in the overall pattern across the District today. High temperatures will reach the upper 80's to low 90's on the plains with low to mid 80's along the foothills. Dew points are currently in the low to mid 50's and should slowly mix out into the upper 40's this afternoon. This will continue the low threat today for isolated heavy rainfall favoring areas east of I-25 where slightly deeper moisture is available.
-	Storms will initiate over the higher terrain around midday with storms moving off the foothills between 12-2pm. Best chance for storms will be from 1-4pm with additional weak storm development after 4pm although a brief isolated strong storm cannot be completely ruled out after 4pm until sunset. Thunderstorms will be fast moving from W/NW to E/SE between 10-20mph which should help limit point rainfall amounts. 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 low to mid 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: A slight chance tomorrow for afternoon rain showers/isolated thunderstorms with temperatures reaching the low to mid 90's across the plains. high-pressure starts to build over the region Friday leading to drier conditions through the weekend.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Arapahoe	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Boulder	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Broomfield	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Denver	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Douglas	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Jefferson	100 PM TO 800 PM	Trace (50%) to 0.3" (20%) to 0.8" (10%)	LOW
Foothills above 6500ft
Boulder	100 PM TO 800 PM	Trace (50%) to 0.3" (10%) to 0.8" (5%)	NONE
Douglas	100 PM TO 800 PM	Trace (50%) to 0.3" (10%) to 0.8" (5%)	NONE
Jefferson	100 PM TO 800 PM	Trace (50%) to 0.3" (10%) to 0.8" (5%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.