The latest ECMWF weekly long-range model predicts that most of the true Arctic air that has been making on and off visits to central/eastern Canada and parts of the U.S. will fade away after the 10th as it shifts to the other side of the pole and back into northern and northeastern Asia.
Cold air should still dominate across the eastern two-thirds of Canada through next week, though not nearly as cold for the Prairies.
However, the model still shows plenty of blocking from northeastern Canada through southeastern Greenland so that we may end up with a more active storm pattern across the U.S. with potential for more rain/snow events, especially from the southwestern U.S. and then points northeast.
Look for a quick-hitting snow for southeastern Newfoundland on Saturday, perhaps on the order of 8-15 cm.
The GFS model has shifted a little more to the east with the Sunday night storm for the Maritimes and now focuses the heaviest snow across central and eastern New Brunswick. Still looks like a change to rain for Nova Scotia.
This storm will move rather quickly as there is little upstream blocking, but the snow/rain could come down fast and furious as the storm dynamics look very impressive for a six- to 8-hour period.
My look at the overall pattern across Canada for this week.
Some forecast model clues through the end of August and an update on global sea surface temperatures.
Tornado threat into Tuesday from southeastern Saskatchewan to northwest Ontario.
Latest weekly clues to the long range forecast through mid-August.
Major storm for the Prairies early next week could bring heavy rainfall and severe thunderstorms.
Severe thunderstorm threat later Thursday and a general look at the upcoming weather pattern.