I'm not sure about The Weather Network Don, but Weatherbell seems to have been basing their forecast on the warm water south of Alaska, and how this apparently led to cold in years like 2003, 2014, and 2015. However, it has to be said that, on his blog this morning, Joe Bastardi has drawn attention to the winter of 1936-1937, which apparently also had warm water in the Gulf of Alaska, but ended up with a warm winter in eastern North America, following a colder than average November. Here is a link to that winter's observations in Toronto.
https://climate.weather.gc.ca/climate_data/daily_data_e.html?hlyRange=1953-01-01|1969-05-31&dlyRange=1840-03-01|2017-04-27&mlyRange=1840-01-01|2006-12-01&StationID=5051&Prov=ON&urlExtension=_e.html&searchType=stnName&optLimit=yearRange&StartYear=1840&EndYear=1977&selRowPerPage=25&Line=0&searchMethod=contains&txtStationName=Toronto&timeframe=2&Day=1&Year=1937&Month=1