For Canadians I use this:
Pacific region:
http://www.weatheroffice.gc.ca/radar/index_e.html?id=PAC
Prairie Region:
http://www.weatheroffice.gc.ca/radar/index_e.html?id=WRN
Ontario Region:
http://www.weatheroffice.gc.ca/radar/index_e.html?id=ONT
All you have to do is click on the black dots and you can see the regional weather radar - even I have learned to be able to forecast the precipitation and times it will start and end.
Add in the current conditions from here:
http://www.weatheroffice.gc.ca/canada_e.html
And all of a sudden you are better than the guy who gets paid to make the guesses.
Cheers
BC