Weather Highlights for this Week and Beyond

--A weak storm feeding upon warm, humid air will bring widespread showers and heavy downpours to a large portion of Atlantic Canada Tuesday into Tuesday night. The heaviest rainfall will be over Nova Scotia, New Brunswick and PEI on Tuesday then spread into western Newfoundland Tuesday night. I can easily see localized rainfall amounts of 25-50 mm, especially over southern and central New Brunswick.

--A cold front will bring a line of thunderstorms, some locally strong to southern Ontario on Tuesday then up into eastern Ontario and southern Quebec Tuesday evening. Behind this front northwesterly winds will bring much drier air and pleasant conditions Wednesday and into Thursday across the region.

--A weak disturbance riding southeast with the jet stream will trigger isolated, but locally heavy thunderstorms Tuesday afternoon from the north-central Alberta through central Saskatchewan and into western Manitoba. A few thunderstorms will also likely build over the Canadian Rockies (Banff NP region) Tuesday afternoon.

--Potential exists for strong to severe thunderstorms over central and southern Ontario late in the week, though exact timing is still highly in doubt. Right now, the potential is in the Friday to Saturday time period.

--Another batch of significant rainfall is possible for Atlantic Canada in the Friday night to Saturday period. Again details are sketchy as timing of individual storms and fronts is still in question.

--The spell of very warm weather across the interior of BC will come to an end starting Thursday followed by slightly cooler than normal conditions during the Friday through Sunday period.

--Average temperatures this week from Manitoba to Quebec will be near to below normal thanks to a series of fronts bringing in some cool air from the north.

--I do not see any signs of another heatwave across Canada for at least the next two weeks.

--Strong Atlantic ridge will keep the humidity levels fairly high from Nova Scotia through Newfoundland the rest of this week, thus average temperatures will remain above normal through the weekend mainly due to the nighttime temperatures running well above normal.

--Another big reason for the warm temperature anomalies across Atlantic Canada is the unusually warm sea surface waters of the Atlantic. Ocean water temperatures surrounding Nova Scotia and just south of Newfoundland are averaging a whopping 3 degrees C. (5.5 F) above normal (see image below). I do not expect this to change much into the Fall.

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