Ten military helicopters took off from Boulder Municipal Airport late this morning after being grounded most of the morning because of rain and clouds.
Colorado National Guard Lt. James Goff says 19 helicopters are available for search-and-rescue operations.
Crews are searching for pockets of individuals still stranded from flooding that began late last week.
Goff says helicopter crews on Sunday rescued 12 people before the weather halted the flights. Eighty more people were evacuated by ground.