Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 11pm this evening. Rain showers are on the increase over the District at this time with thunderstorms possible as the day progresses.
-	Rain showers will become widespread with embedded thunderstorms capable of producing heavy rainfall that may lead to excessive runoff and possibly flash flooding. Most thunderstorms that develop today are expected to be weak with brief heavy rainfall but a stronger storm will be capable of extended periods of heavy rainfall due to slow storm motions.
-	Rainfall rates from non-thunderstorm moderate to heavy rain showers will generally be in the 0.1-0.4"/hr rate but may reach up to 1.0"/hr rate under heavier showers. Creeks and streams will likely be running high later today and tonight and it may not take much rain to produce excessive runoff if the ground becomes saturated.

STORM RAINFALL POTENTIAL AND DURATION: Weak thunderstorms will have the potential to produce 0.2-0.6" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce 0.4-1.2" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm becomes stationary with up to 2.4" of rain possible in 45-75 minutes.

County	Message	Valid Times	Prime Time
Wheat Ridge	1	Current TO 1100 PM	Current TO 1000 PM
Arvada	1	Current TO 1100 PM	Current TO 1000 PM
the City of Aurora	1	Current TO 1100 PM	Current TO 1000 PM
Arapahoe County	1	Current TO 1100 PM	Current TO 1000 PM
DIA	1	Current TO 1100 PM	Current TO 1000 PM
Denver County	1	Current TO 1100 PM	Current TO 1000 PM
Adams County	1	Current TO 1100 PM	Current TO 1000 PM
Douglas 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
Lakewood	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 SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Arapahoe	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Boulder	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Broomfield	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Denver	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Douglas	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (80%) to 1.0" (30%)	HIGH
Jefferson	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Foothills above 6500ft
Boulder	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH
Douglas	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (80%) to 1.0" (30%)	HIGH
Jefferson	Current TO 1100 PM SUN	0.1" (100%) to 0.4" (75%) to 1.0" (25%)	HIGH

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.