The clipper precipitation is now east of Toronto and will be in the Ottawa area this evening. I think it'll be mostly snow. I have no objections to the 2-4 cm value given by Env. Can. As an aside, New England/Maine into Eastern Canada will get another thump (much smaller than last week's blizzard) of snow tomorrow into Saturday as a system blows up along the arctic front trailing this clipper.
The system on Tuesday will likely be a mixed bag of precipitation. The GFS has backed off on the intensity but still gives us 10 cms of snow +/-. The Euro gives us a snow to rain to snow system with the snow values of a few cms or so.
The system next Friday is still there on both the GFS and Euro and still is a biggey.