Flash Flood Prediction Program

Message 2’s will continue valid as the threat of heavy rainfall remains at this time.

Another round of showers is currently moving through the District at this time. After a strong round of thunderstorms for portions of the District this afternoon, these additional showers should remain weaker through the rest of the evening and through the overnight. However, due to excess moisture and good upper-level support still in place, a chance remains for some moderate to brief heavy rain. The biggest threat at this time will be a quick 0.5” in 10 minutes, although training of rain showers could bring extended moderate to brief heavy rainfall at times through the overnight.

The best chance for additional rain will be from NOW through midnight with a few lingering showers from midnight through daybreak tomorrow. Overnight lows will drop into the low 50’s on the plains with mid to upper 40’s along the foothills.

STORM RAINFALL POTENTIAL AND DURATION: Typical thunderstorms have the potential to produce moderate to heavy rainfall of 0.2” to 0.5" total, in 10 to 30 minutes. Strong thunderstorms have the potential to produce moderate to heavy rainfall of 0.5” to 1.2” total, in 10 to 30 minutes.

WORST CASE SCENARIO: Trainign or slow-moving thunderstorms have the potential to produce
up to 2.0” total in 45-60 minutes.

County	Message	Valid Times	Prime Time
Lakewood	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Wheat Ridge	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Arvada	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
the City of Aurora	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Arapahoe County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
DIA	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Denver County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Adams County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Douglas County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Broomfield County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Jefferson County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY
Boulder County	2	Current TO 300 AM MONDAY	Current TO 200 AM MONDAY

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Arapahoe	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Boulder	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Broomfield	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Denver	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Douglas	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Jefferson	Current TO 300 AM MON	0.2" (60%) to 0.5" (30%) to 1.2" (10%)	ISSUED
Foothills above 6500ft
Boulder	Current TO 300 AM MON	0.2" (80%) to 0.5" (40%) to 1.2" (20%)	ISSUED
Douglas	Current TO 300 AM MON	0.2" (80%) to 0.5" (40%) to 1.2" (20%)	ISSUED
Jefferson	Current TO 300 AM MON	0.2" (80%) to 0.5" (40%) to 1.2" (20%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.