Time: 1008 AM Sat June 22, 2019 Forecaster: Justin Brooks

Heavy Precipitation Outlook
Flash Flood Prediction Program

COOL TODAY WITH A CHANCE FOR RAIN/ISOLATED THUNDERSTORM THIS AFTERNOON/EVENING
-A low-pressure trough is stalled out over Colorado, combined with a cool, moist air mass from the north has resulted in light to moderate showers across the District this morning with temperatures in the mid to upper 40s. Temperatures today will increase into the upper 50s to low 60s once showers taper off later this morning.
-Another day of showers/isolated thunderstorms is expected after midday today with multiple rounds of showers/isolated thunderstorms likely to persist into the overnight hours and into Sunday morning, with the best chance for rain tapering off by midnight tonight. Temperatures will remain cool this evening with lows in the low 40's for the plains with upper 30's to low 40's for the foothills.
-Rain showers and isolated thunderstorms will move from W/SW to E/NE today at 15-20mph and could produce localized moderate to brief heavy rain with the best chance for the southern and far eastern District to see any strong storm development this afternoon, as more widespread showers are expected as the night progresses.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers or thunderstorms will produce 0.1-0.3" of rain in 10-30 minutes. A moderate thunderstorm storm could produce 0.3-0.6" in 10-30 minutes.

WORST CASE SCENARIO: Training of rain showers/thunderstorms, or a strong thunderstorm could produce up to 1.2" in 30-60 minutes.

A LOOK AHEAD: A continued unsettled pattern Sunday will result in another chance for rain showers and isolated thunderstorms, with the severity of storms will hinge on how much diurnal heating is in place as temperatures should remain cool through Sunday. Monday will begin to warm up and dry out across the region with 80 degree temperatures expected all next week with a chance for the first 90 degree day this year later in the week.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Arapahoe 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Boulder 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Broomfield 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Denver 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Douglas 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Jefferson 100 PM TO 800 PM
Trace (90%) to 0.3" (40%) to 0.6" (20%) LOW
Foothills above 6500ft      
Boulder 100 PM TO 800 PM
Trace (90%) to 0.3" (30%) to 0.6" (10%) LOW
Douglas 100 PM TO 800 PM
Trace (90%) to 0.3" (30%) to 0.6" (10%) LOW
Jefferson 100 PM TO 800 PM
Trace (90%) to 0.3" (30%) to 0.6" (10%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.