Flash Flood Prediction Program

-	Thunderstorms have developed to the N and NW of the District and if they maintain their current strength may produce moderate to brief heavy rainfall and possibly severe weather in the form of large hail.
-	Thunderstorms may very well decrease in strength upon approach as the air mass over the District has not been able to support storms all day but upper level support may help this current storm maintain its strength... Thunderstorms will be fast moving from NW to SE at around 25-30mph.
-	Fast storm motions will help to limit point rainfall amounts with stronger storms likely producing more hail than heavy rainfall but heavy rainfall cannot be entirely ruled out. Message 1's may be issued shortly.

STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms will produce a trace to 0.3" in 10-30 minutes. Strong thunderstorms will have the potential to produce 0.3-0.8" in 10-30 minutes.

WORST CASE SCENARIO: A slow moving strong thunderstorm or a very large thunderstorm may produce up to 1.6" in 45-60 minutes. Supplemental QPF is available at https://qpf.udfcd.org

A LOOK AHEAD: A continued chance for afternoon thunderstorm activity on Saturday with a relatively low threat for heavy rainfall.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (15%)	MOD
Arapahoe	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (10%)	LOW
Boulder	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (15%)	MOD
Broomfield	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (10%)	LOW
Denver	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (15%)	MOD
Douglas	Current TO 1159 PM FRI	Trace (60%) to 0.3" (40%) to 0.8" (5%)	LOW
Jefferson	Current TO 1159 PM FRI	Trace (60%) to 0.3" (40%) to 0.8" (5%)	LOW
Foothills above 6500ft
Boulder	Current TO 1159 PM FRI	Trace (75%) to 0.3" (55%) to 0.8" (10%)	LOW
Douglas	Current TO 1159 PM FRI	Trace (40%) to 0.3" (30%) to 0.8" (5%)	LOW
Jefferson	Current TO 1159 PM FRI	Trace (50%) to 0.3" (40%) to 0.8" (5%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.