Time: 814 AM Fri July 31, 2020 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

GENERALLY DRY WITH A FEW ISOLATED THUNDERSTORMS POSSIBLE FAVORING THE HIGHER TERRAIN
-N/NW upper-level flow aloft has moved drier air into the District today with surface dew points expected around 40. The lower moisture levels and a warm layer of air aloft is expected to result in generally dry conditions although isolated rain showers and thunderstorms cannot be ruled out, mainly in and near the foothills.
-Although the chances for thunderstorms is low the storms that do manage to develop will have the potential to produce isolated moderate to brief heavy rainfall, mainly along the foothills. Storms should begin to form over the higher terrain between 1-3pm. Storm motions from N/NW to S/SE at around 15-25mph will help limit point rainfall amounts. Storms that do make it off the foothills will likely evaporate as they move onto the plains resulting in a higher chance for gusty winds rather than isolated moderate to brief heavy rainfall.
-Warmer temperatures today in the mid to upper 80's on the plains with mid to upper 70's in the foothills. Skies will clear into the evening with overnight temperatures dropping into the low to mid 60's on the plains with low to mid 50's in the foothills.
STORM RAINFALL POTENTIAL AND DURATION: Isolated rain showers and weak thunderstorms will produce a trace to 0.1". Moderate thunderstorms will have the potential to produce 0.1-0.4" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm is able to develop with the potential to produce 0.4-0.8" in 10-30 minutes. Supplemental QPF is available at https://qpf.udfcd.org

A LOOK AHEAD: Another slight chance for storm activity Saturday as high temperatures remain in the mid to upper 80's. Storm chances increase Sunday as a stronger disturbance makes its way through the region which will bring a chance for more widespread heavy rainfall.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.4" (5%) NONE
Arapahoe 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.4" (5%) NONE
Boulder 200 PM TO 800 PM
Trace (40%) to 0.1" (25%) to 0.4" (10%) NONE
Broomfield 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.4" (5%) NONE
Denver 200 PM TO 800 PM
Trace (30%) to 0.1" (15%) to 0.4" (5%) NONE
Douglas 200 PM TO 800 PM
Trace (40%) to 0.1" (20%) to 0.4" (5%) NONE
Jefferson 200 PM TO 800 PM
Trace (40%) to 0.1" (20%) to 0.4" (5%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 800 PM
Trace (50%) to 0.1" (30%) to 0.4" (15%) NONE
Douglas 200 PM TO 800 PM
Trace (40%) to 0.1" (25%) to 0.4" (10%) NONE
Jefferson 200 PM TO 800 PM
Trace (50%) to 0.1" (30%) to 0.4" (15%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.