Time: 1246 PM Mon May 27, 2019 Forecaster: Nick Barlow

Internal Message Status
Flash Flood Prediction Program

MESSAGE 1'S ISSUED FOR THE ENTIRE DISTRICT
-Message 1's have been issued for the entire District, valid until 10:00pm.
-A Pacific trough of low pressure moves across Colorado Monday. Strong large-scale lift will combine with ample surface moisture to produce strong to severe thunderstorms capable of heavy rainfall.
-Today's storms will track to the NE at around 15-25mph, with multiple rounds of widely-scattered storms possible. Message 1's may need to be extended into the overnight period, if current trends continue to support the threat for heavy rainfall into Tuesday morning.
STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate showers and thunderstorms will produce rainfall amounts between 0.1-0.3" in 10-30 minutes. Strong to severe thunderstorms will produce rainfall between 0.3-0.9" in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving, strong to severe thunderstorm or training of storm cells over the same area results in rainfall up to 2.0" in 45-75 minutes.

County Message Valid Times Prime Time
Arvada 1 Current TO 1000 PM Current TO 900 PM
the City of Aurora 1 Current TO 1000 PM Current TO 900 PM
Arapahoe County 1 Current TO 1000 PM Current TO 900 PM
DIA 1 Current TO 1000 PM Current TO 900 PM
Denver County 1 Current TO 1000 PM Current TO 900 PM
Adams County 1 Current TO 1000 PM Current TO 900 PM
Douglas County 1 Current TO 1000 PM Current TO 900 PM
Broomfield County 1 Current TO 1000 PM Current TO 900 PM
Boulder County 1 Current TO 1000 PM Current TO 900 PM
Jefferson County 1 Current TO 1000 PM Current TO 900 PM
Wheat Ridge 1 Current TO 1000 PM Current TO 900 PM
Lakewood 1 Current TO 1000 PM Current TO 900 PM

County-specific Quantitative
Precipitation Outlook
Precipitation Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1000 PM MON
0.1" (90%) to 0.3" (60%) to 0.9" (30%) ISSUED
Arapahoe Current TO 1000 PM MON
0.1" (90%) to 0.3" (60%) to 0.9" (25%) ISSUED
Boulder Current TO 1000 PM MON
0.1" (90%) to 0.3" (60%) to 0.9" (25%) ISSUED
Broomfield Current TO 1000 PM MON
0.1" (85%) to 0.3" (55%) to 0.9" (20%) ISSUED
Denver Current TO 1000 PM MON
0.1" (85%) to 0.3" (55%) to 0.9" (25%) ISSUED
Douglas Current TO 1000 PM MON
0.1" (80%) to 0.3" (45%) to 0.9" (15%) ISSUED
Jefferson Current TO 1000 PM MON
0.1" (85%) to 0.3" (55%) to 0.9" (25%) ISSUED
Foothills above 6500ft      
Boulder Current TO 1000 PM MON
0.1" (90%) to 0.3" (60%) to 0.9" (25%) ISSUED
Douglas Current TO 1000 PM MON
0.1" (80%) to 0.3" (45%) to 0.9" (15%) ISSUED
Jefferson Current TO 1000 PM MON
0.1" (85%) to 0.3" (55%) to 0.9" (25%) ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.