Flash Flood Prediction Program

-	Message 1's have been extended until 4:00 AM as additional thunderstorms lurk N of the District and may impact areas of the District into the pre-dawn hours. These weak to moderate thunderstorms may not translate southward into the District and weaken on approach but the threat remains.
-	The strength of the storms should they survive into the District will likely be more weak to moderate but even moderate thunderstorms will have the potential to produce brief heavy rainfall as the atmosphere is loaded with moisture. The threat for heavy rainfall is lower than earlier this evening but cannot be ruled out.
-	Showers and thunderstorms will move from N to S to NW to SE at around 20mph. Storm motions have increased from earlier this evening and faster storm motions will help to limit point rainfall amounts from a single storm keeping any heavy rainfall brief.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce a trace to 0.3" in 10-30 minutes. Moderate thunderstorms will have the potential to produce rainfall rates of 0.3-0.9" in 10-30 minutes.

WORST CASE SCENARIO: A strong thunderstorm will be capable of producing rainfall rates of 0.5-1.5" in 10-30 minutes.

County	Message	Valid Times	Prime Time
Boulder County	1	Current TO 400 AM	Current TO 330 AM
Jefferson County	1	Current TO 400 AM	Current TO 330 AM
Broomfield County	1	Current TO 400 AM	Current TO 330 AM
Douglas County	1	Current TO 400 AM	Current TO 330 AM
Adams County	1	Current TO 400 AM	Current TO 330 AM
Denver County	1	Current TO 400 AM	Current TO 330 AM
DIA	1	Current TO 400 AM	Current TO 330 AM
Arapahoe County	1	Current TO 400 AM	Current TO 330 AM
the City of Aurora	1	Current TO 400 AM	Current TO 330 AM
Arvada	1	Current TO 400 AM	Current TO 330 AM
Wheat Ridge	1	Current TO 400 AM	Current TO 330 AM
Lakewood	1	Current TO 400 AM	Current TO 330 AM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 400 AM THU	0.1" (80%) to 0.3" (60%) to 0.9" (15%)	ISSUED
Arapahoe	Current TO 400 AM THU	0.1" (60%) to 0.3" (40%) to 0.9" (10%)	ISSUED
Boulder	Current TO 400 AM THU	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	ISSUED
Broomfield	Current TO 400 AM THU	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	ISSUED
Denver	Current TO 400 AM THU	0.1" (75%) to 0.3" (50%) to 0.9" (15%)	ISSUED
Douglas	Current TO 400 AM THU	0.1" (50%) to 0.3" (25%) to 0.9" (10%)	ISSUED
Jefferson	Current TO 400 AM THU	0.1" (60%) to 0.3" (30%) to 0.9" (15%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 400 AM THU	0.1" (60%) to 0.3" (30%) to 0.9" (15%)	ISSUED
Douglas	Current TO 400 AM THU	0.1" (60%) to 0.3" (30%) to 0.9" (15%)	ISSUED
Jefferson	Current TO 400 AM THU	0.1" (60%) to 0.3" (30%) to 0.9" (15%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.