Time: 916 AM Thu July 11, 2019 Forecaster: Nick Barlow

Heavy Precipitation Outlook
Flash Flood Prediction Program

WARM WITH ISOLATED AFTERNOON & EVENING THUNDERSTORMS POSSIBLE
-Temperatures warm back into the mid 90s Thursday, underneath a strong ridge of high pressure anchored over SW Colorado.
-Look for plenty of sunshine for much of the day, before a few isolated showers and thunderstorms move off the mountains and foothills onto the adjacent plains late this afternoon. Today’s storms will produce little rainfall, with brief gusty winds and lightning being the primary threats.
-Today's storms will track to the ESE at around 12-18mph, with the best chance for a storm over the District occurring between about 4:00pm-8:00pm.
STORM RAINFALL POTENTIAL AND DURATION: Isolated showers and thunderstorms will produce rainfall amounts between Trace-0.15" in 10-30 minutes.

WORST CASE SCENARIO: Surface moisture does not mix out as forecasted, allowing a stronger thunderstorm to produce up to 0.40" rainfall in 30-60 minutes.

A LOOK AHEAD: The ridge shifts slightly on Friday, helping draw mid and upper-level moisture N over Colorado. We’ll see a better chance for mainly high-based showers and thunderstorms as a result, while temperatures continue in the mid to upper 90s.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 400 PM TO 800 PM
Trace (60%) to 0.1" (30%) to 0.2" (5%) NONE
Arapahoe 400 PM TO 800 PM
Trace (70%) to 0.1" (45%) to 0.2" (10%) NONE
Boulder 400 PM TO 800 PM
Trace (60%) to 0.1" (30%) to 0.2" (5%) NONE
Broomfield 400 PM TO 800 PM
Trace (60%) to 0.1" (30%) to 0.2" (5%) NONE
Denver 400 PM TO 800 PM
Trace (70%) to 0.1" (45%) to 0.2" (10%) NONE
Jefferson 400 PM TO 800 PM
Trace (75%) to 0.1" (50%) to 0.2" (15%) NONE
Douglas 300 PM TO 800 PM
Trace (75%) to 0.1" (50%) to 0.2" (15%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 800 PM
Trace (70%) to 0.1" (45%) to 0.2" (10%) NONE
Douglas 200 PM TO 800 PM
Trace (90%) to 0.1" (60%) to 0.2" (20%) NONE
Jefferson 200 PM TO 800 PM
Trace (80%) to 0.1" (55%) to 0.2" (20%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.