Time: 840 AM Wed July 29, 2020 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARMER TODAY WITH A SLIGHT CHANCE OF AN ISOLATED HIGH BASED RAIN SHOWER/THUNDERSTORM THIS AFTERNOON AND EARLY EVENING
-NW flow aloft today will bring in drier air both at the surface and upper-level. This will decrease rain chances across the District today as high temperatures reach the upper 80's to low 90's on the plains with upper 70's to low 80's along the foothills.
-A weak cold front will move in this afternoon resulting in a slight chance for a brief high based rain shower/isolated thunderstorm, with the largest threat being gusty wind and lightning. With NW upper-level flow and surface dew points dropping into the low 40's today will result in a decreased chance for rainfall, although a brief isolated moderate rain shower cannot be completely ruled out, favoring eastern portions of the District.
-Today should be both the warmest and driest day of the week. Overnight lows will drop into the upper 50's to mid 60's with mostly clear skies.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.1" of rain in 10-30 minutes. A moderate thunderstorm could produce 0.1-0.2" in 10-30 minutes. Supplemental QPF is available at https://qpf.udfcd.org

WORST CASE SCENARIO: A strong, slow moving thunderstorm formed off an outflow boundary has the potential produce up to 0.5" in 30-60 minutes.

A LOOK AHEAD: Cooler tomorrow with high temperatures in the low to mid 80's with a slightly better chance for afternoon rain showers/isolated thunderstorms, with minimal, if any threat for heavy rainfall at this time. This pattern will continue through the rest of the week and into the weekend with highs in the 80's along with a chance for afternoon rain showers/isolated thunderstorms through Sunday.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Arapahoe 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Boulder 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Broomfield 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Denver 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Douglas 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Jefferson 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Douglas 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Jefferson 200 PM TO 800 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.