The National Weather Service issued an updated snow squall warning at 12:54 p.m. on Saturday in effect until 1:30 p.m. for Crawford and Erie counties.

Avoid or delay travel: If a snow squall warning is issued for your vicinity, it's advisable to postpone or refrain from motor travel until the squall has passed through your area. Highways and roads are particularly hazardous during snow squalls.

An orange snowfall warning is in place for much of the Greater Toronto Area, including York, Durham and Peel regions. CBC's Dwight Drummond spoke to Environment Canada's senior climatologist to find out why the warning wasn't issued sooner.

Update: Just before 8 a.m., the warning was upgraded to “Orange” level with a high impact as “significant snowfall continues” across the Greater Toronto Area and southern Ontario. Environment Canada has three warning levels – yellow,