Prominent hydrologists are sounding the alarm as another dry summer in southern Alberta — with the possibility of water restrictions — is coming into focus.

Water levels are low. Really low.

"The snowpacks in the mountain headwaters of the Bow River, the Oldman River, Red Deer River and North Saskatchewan River are generally extremely low, some of the lowest I've ever seen," John Pomeroy told CBC News in a Tuesday interview.

Pomeroy is the director of the Global Water Futures program at the Univer…