Flash Flood Prediction Program

A more active pattern emerges today as elevated moisture and favorable upper-level winds support chances for scattered thunderstorms during the afternoon and evening. Temperatures will remain above normal with highs climbing into the low to mid 90s. Dewpoints will be in the low 50s with precipitable water (PWAT) values between 0.80”-1.00”. More meaningful rainfall is expected with storms today, along with the potential for severe storms to produce gusty outflows exceeding 58 mph and/or hail greater than 1 inch in diameter. Thunderstorm clusters are also possible as outflow boundaries repeatedly initiate convection. Storm motions will be from west to east around 15-20 mph.

STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms today have the potential to produce up to 0.50” in 10-30 minutes. Strong thunderstorms may produce up to 0.75” in 10-30 minutes.

WORST CASE SCENARIO: Thunderstorm clusters or complexes may be capable of producing 1.00” or more in 30 minutes or less.

A LOOK AHEAD: Thursday will be similar, with highs in the low to mid 90s and scattered afternoon to evening thunderstorms with the potential to produce meaningful rainfall and severe weather. The heat wave will begin to recede southward on Friday, promoting slightly cooler temperatures across the area broadly. Isolated showers and thunderstorms are likely during the afternoon and evening.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Arapahoe	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Boulder	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Broomfield	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Denver	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Douglas	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Jefferson	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Foothills above 6500ft
Boulder	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Douglas	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD
Jefferson	200 PM TO 800 PM	0.25" (75%) to 0.5" (50%) to 0.75" (25%)	MOD

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.