The latest update of the ECMWF long-range model is quite a change from the previous run, which was not unexpected as the model has been all over the place recently, but also the fact that there is a significant warming event underway in the stratosphere in the far northern latitudes which could eventually (in 10-20 days) translate to a widespread outbreak of cold weather for a large part of southern Canada and into parts of the U.S. as the Arctic and North Atlantic Oscillations go back into the negative phase.
Clearly, the model has trended colder since the last run, but it still likely has even more catching up to do over the next week or two.
In the meantime, many in the east will be able to enjoy a spell of milder weather next week.
Remember, you can also follow my comments on the weather pattern on my twitter page @BrettAWX
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Large wildfires in B.C. are sending smoke far to the east. Large thunderstorm complexes may target southern Ontario later this week.
Hot and generally dry weather to focus more in the West, while several fronts will bring cooler shots and some rainfall to the East the next 7-10 days.
Cooler air to expand from Prairies to eastern Canada late June into early July.