A storm will slowly move across central Ontario through this evening. Colder air moving in aloft will gradually change any rain or mixed precipitation to snow showers this afternoon.
By tonight, a secondary storm will form near eastern New England and will enhance precipitation across Maine, eastern Quebec and the Maritimes with the potential for heavier snow over northern Maine, northern New Brunswick and up near Quebec City and over to the Gaspe for tonight into early Wednesday.
Mixed precipitation will limit snowfall across southern New Brunswick, PEI and northern Nova Scotia, with mostly rain farther south. I still can also see some mixed precipitation right in Montreal this evening as the winds start to downslope into the river valley.
Weather pattern clues through the end of October.
Major rainfall event for the Maritimes late tonight, Wednesday and Wednesday night. Heaviest rain headed for central New Brunswick.
Flood potential for portions of the Maritimes midweek.
My latest interpretation of the weekly long range forecast output.
Weekly weather pattern clues into mid-October.
A look at some of the pattern highlights this week into next week across Canada.