Advisory for Calgary and other Alberta communities upgraded to warning

A severe thunderstorm watch called Sunday morning has now been upgraded to a warning for a number of communities in central and southern Alberta, including Calgary. Environment Canada put the watch in place at about 11:30 a.m. Sunday. By about 4 p.m., the agency upgraded it to a warning. "Thunderstorms will develop along a surface trough this afternoon and continue into the evening. Some of these thunderstorms may become severe," the agency says on its website. It adds large hail has the potenti