Time: 647 PM Mon June 17, 2019 Forecaster: Brad Simmons

Internal Message Status
Flash Flood Prediction Program

MESSAGES WILL CONTINUE VALID
-Message 1's will continue valid into the evening although there is a relative lull in the storm activity currently and the threat for heavy rainfall is slowly on the decrease.
-Now that temperatures have cooled into the 50's and 60's across the District the threat for strong thunderstorms is decreasing. An upper level disturbance moving through the state currently will supply enough upper level lift to keep the chances for additional rain showers and possibly weak to moderate thunderstorms ongoing through the evening.
-With abundant surface moisture even a moderate thunderstorm could still produce heavy rainfall that could lead to excessive runoff. A strong thunderstorm is unlikely, but cannot be ruled out.
STORM RAINFALL POTENTIAL AND DURATION: Typical weak to moderate thunderstorms will produce 0.3-0.9" in 10-30 minutes. An isolated strong thunderstorm may be capable of producing 0.5-1.5" in 10-30 minutes.

WORST CASE SCENARIO: An anchored strong thunderstorm or training of thunderstorm cells may result in up to 2.5" in 60 minutes or less.

County Message Valid Times Prime Time
Lakewood 1 Current TO 1100 PM Current TO 1000 PM
Wheat Ridge 1 Current TO 1100 PM Current TO 1000 PM
Arvada 1 Current TO 1100 PM Current TO 1000 PM
Arapahoe County 1 Current TO 1100 PM Current TO 1000 PM
the City of Aurora 1 Current TO 1100 PM Current TO 1000 PM
DIA 1 Current TO 1100 PM Current TO 1000 PM
Douglas County 1 Current TO 1100 PM Current TO 1000 PM
Adams County 1 Current TO 1100 PM Current TO 1000 PM
Denver County 1 Current TO 1100 PM Current TO 1000 PM
Broomfield County 1 Current TO 1100 PM Current TO 1000 PM
Jefferson County 1 Current TO 1100 PM Current TO 1000 PM
Boulder County 1 Current TO 1100 PM Current TO 1000 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1100 PM MON
Trace (70%) to 0.4" (25%) to 0.9" (5%) ISSUED
Arapahoe Current TO 1100 PM MON
Trace (90%) to 0.4" (30%) to 0.9" (5%) ISSUED
Boulder Current TO 1100 PM MON
Trace (70%) to 0.4" (25%) to 0.9" (5%) ISSUED
Broomfield Current TO 1100 PM MON
Trace (70%) to 0.4" (25%) to 0.9" (5%) ISSUED
Denver Current TO 1100 PM MON
Trace (80%) to 0.4" (25%) to 0.9" (5%) ISSUED
Douglas Current TO 1100 PM MON
Trace (90%) to 0.4" (30%) to 0.9" (5%) ISSUED
Jefferson Current TO 1100 PM MON
Trace (85%) to 0.4" (30%) to 0.9" (5%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1100 PM MON
Trace (80%) to 0.4" (25%) to 0.9" (5%) ISSUED
Douglas Current TO 1100 PM MON
Trace (95%) to 0.4" (30%) to 0.9" (5%) ISSUED
Jefferson Current TO 1100 PM MON
Trace (90%) to 0.4" (30%) to 0.9" (5%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.