Time: 1039 PM Tue May 19, 2020 Forecaster: Brad Simmons

Heavy Precipitation Outlook
Flash Flood Prediction Program

ISOLATED RAIN SHOWERS AND POSSIBLY A THUNDERSTORM LATE THIS EVENING
-Moisture from thunderstorm activity E and SE of the District earlier today has pushed into the foothills initiating isolated rain showers and weak thunderstorms over S and SW portions of the District. A threat for rain showers and isolated thunderstorms will continue over the next 3-4 hours.
-Thunderstorms will be isolated and fast moving from SSW to NNE at around 30mph. Gusty winds, lightning, and brief moderate rainfall as well as hail will be possible under the stronger thunderstorms. The fast storm motion will help to reduce point rainfall amounts.
STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will produce a trace to 0.10". Moderate thunderstorms may produce 0.1-0.4" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm is able to develop with the potential to produce 0.4-1.2" in 10-30 minutes.

A LOOK AHEAD: A slight chance for isolated thunderstorms again tomorrow afternoon/evening with breezy winds continuing.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 200 AM WED
Trace (60%) to 0.1" (30%) to 0.4" (10%) NONE
Arapahoe Current TO 200 AM WED
Trace (60%) to 0.1" (30%) to 0.4" (10%) NONE
Boulder Current TO 200 AM WED
Trace (60%) to 0.1" (30%) to 0.4" (10%) NONE
Broomfield Current TO 200 AM WED
Trace (60%) to 0.1" (30%) to 0.4" (10%) NONE
Denver Current TO 200 AM WED
Trace (60%) to 0.1" (30%) to 0.4" (10%) NONE
Douglas Current TO 200 AM WED
Trace (80%) to 0.1" (50%) to 0.4" (10%) NONE
Jefferson Current TO 200 AM WED
Trace (75%) to 0.1" (40%) to 0.4" (10%) NONE
Foothills above 6500ft      
Boulder Current TO 200 AM WED
Trace (80%) to 0.1" (50%) to 0.4" (10%) NONE
Douglas Current TO 200 AM WED
Trace (80%) to 0.1" (50%) to 0.4" (10%) NONE
Jefferson Current TO 200 AM WED
Trace (80%) to 0.1" (50%) to 0.4" (10%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.