Time: 922 PM Fri June 28, 2019 Forecaster: Nick Barlow

Heavy Precipitation Outlook
Flash Flood Prediction Program

SLIGHT INCREASE IN HEAVY RAINFALL POTENTIAL TONIGHT
-Surface moisture has surged out of the ESE this evening, with dew points now in the 40s to near 50 over the southern and eastern portions of the District.
-Widely-scattered shower and thunderstorm activity may persist across portions of the District through roughly 11:00pm at the latest. Most showers and storms will remain high-based, and only produce light rainfall amounts and gusty winds.
-There is a low potential that a stronger, slow-moving thunderstorm could form and produce moderate to briefly heavy rainfall.
STORM RAINFALL POTENTIAL AND DURATION: Showers and thunderstorms will produce rainfall amounts between Trace-0.20" in 10-30 minutes. An isolated, slow-moving thunderstorm could produce up to 0.50" rainfall in 10-30 minutes.

WORST CASE SCENARIO: A slow-moving thunderstorm anchored to a surface boundary or training of storm cells results in rainfall up to 1.20" in 30-60 minutes.

A LOOK AHEAD: Upper-level high pressures nudges E on Saturday, drawing moisture N into Colorado. We'll see a better chance for afternoon and evening showers and thunderstorms as a result, with temperatures in the low to mid 90s expected.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams Current TO 1100 PM FRI
Trace (80%) to 0.2" (50%) to 0.5" (10%) LOW
Arapahoe Current TO 1100 PM FRI
Trace (90%) to 0.2" (60%) to 0.5" (10%) LOW
Boulder Current TO 1100 PM FRI
Trace (70%) to 0.2" (40%) to 0.5" (5%) LOW
Broomfield Current TO 1100 PM FRI
Trace (70%) to 0.2" (40%) to 0.5" (5%) LOW
Denver Current TO 1100 PM FRI
Trace (90%) to 0.2" (60%) to 0.5" (10%) LOW
Douglas Current TO 1100 PM FRI
Trace (90%) to 0.2" (65%) to 0.5" (15%) LOW
Jefferson Current TO 1100 PM FRI
Trace (90%) to 0.2" (65%) to 0.5" (15%) LOW
Foothills above 6500ft      
Boulder Current TO 1100 PM FRI
Trace (75%) to 0.2" (55%) to 0.5" (10%) LOW
Douglas Current TO 1100 PM FRI
Trace (90%) to 0.2" (65%) to 0.5" (15%) LOW
Jefferson Current TO 1100 PM FRI
Trace (90%) to 0.2" (65%) to 0.5" (15%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.