The hail that hit the Calgary area early Monday morning piled up outside people's homes and destroyed plants, including Carmen Anderson's flowers near Airdrie, Alta. ((Submitted by Carmen Anderson))

Cleanup efforts were underway Monday in Calgary and surrounding communities after a vicious hailstorm struck parts of central and southern Alberta early in the morning.

Calgary fire crews were working to remove some of the debris that resulted from the storm, which began just after midnight Monday morning.

Trees were knocked down in the storm, which lasted until about 4 a.m. The hail was accompanied by multiple streaks of lightning strikes.

Some residents in nearby Airdrie, Alta., told CBC News they're still finding pea- and marble-sized hail on the ground as of noon.

Alberta usually gets around 14 severe storms every summer, according to Environment Canada.