Flash Flood Prediction Program

-	Message 1's will be allowed to expire at 6pm as the threat for heavy rainfall has ended, at least through the rest of today... Thunderstorms that moved through the District earlier today produced brief periods of heavy rainfall, hail and even spawned multiple NWS tornado warnings.
-	The stronger thunderstorm activity has pushed well east of the District with additional rain showers and weak thunderstorms remaining possible into the evening but heavy rainfall is no longer a threat until another upper level wave moves through overnight. After midnight tonight another round of rain showers and possibly thunderstorms associated with the strong upper level low pressure system to the NW is expected to move through sometime between 1-7am Friday morning.
-	An additional HPO will be issued this evening to assess the overnight heavy rainfall threat and another Message 1 period may be needed to cover the potential for heavy rainfall.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.1" of rain. Moderate thunderstorms will have the potential to produce 0.1-0.4" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm is able to develop with the potential to produce heavy rainfall of 0.3-0.8" in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 600 PM	Current TO 600 PM
Jefferson County	1	Current TO 600 PM	Current TO 600 PM
Broomfield County	1	Current TO 600 PM	Current TO 600 PM
Douglas County	1	Current TO 600 PM	Current TO 600 PM
Adams County	1	Current TO 600 PM	Current TO 600 PM
Denver County	1	Current TO 600 PM	Current TO 600 PM
DIA	1	Current TO 600 PM	Current TO 600 PM
Arapahoe County	1	Current TO 600 PM	Current TO 600 PM
the City of Aurora	1	Current TO 600 PM	Current TO 600 PM
Arvada	1	Current TO 600 PM	Current TO 600 PM
Wheat Ridge	1	Current TO 600 PM	Current TO 600 PM
Lakewood	1	Current TO 600 PM	Current TO 600 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Arapahoe	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Boulder	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Broomfield	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Denver	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Douglas	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Foothills above 6500ft
Boulder	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Douglas	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE
Jefferson	Current TO 900 PM THU	Trace (60%) to 0.2" (20%) to 0.4" (10%)	NONE

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.