The combination of a slow-moving trough and a surge of humid air will lead to widespread showers and drenching thunderstorms from Wednesday to Friday over a large part of eastern Canada, especially from southern Ontario to southern Quebec.
The ECMWF model 60-hour rainfall total forecast through Friday in inches is shown above. Note the model is indicating the possibility of over 1.5 inches (38 mm) of rain during the period from near Lake Ontario through much of southern Quebec with localized amounts in excess of 2 inches (50 mm) possible.
The bulk of the rainfall for Ontario will be during the Wednesday through early Thursday period, while Quebec will see most of it's rainfall during the Wednesday night to Friday period.
Update on growing season precipitation in the Prairies.....
The EC image below shows the percentage of normal precipitation since the start of the growing season (April 1st) in the Prairies.
As you can see, the start of the growing season has been relatively dry over southern Alberta, while wet conditions dominated from central Saskatchewan to southwestern Manitoba.
Monday morning update on the impending snowstorm for Atlantic Canada
A look at the next two snowstorms and the long-range forecast model update...
A coastal storm will bring accumulating snow to parts of Atlantic Canada from Thursday afternoon into early Friday.
A new pdate on the quick-moving snowstorm coming for parts of Quebec later today into early Monday.
Looking cold in the East for early February while the west turns milder.
A buckling of the jet stream pattern in the East this weekend into next week will end up deflecting much of the milder, Pacific air farther south into the U.S.