Upside-down weather pattern shifts Canada's hot spot to northern Ontario

Tyler Hamilton

With a bizarre turn of events on June 28th and 29th, the national hot spot in Canada was precariously close to the shores of Hudson Bay.

Fort Severn reached a scorching 34.1°C on June 28th and came within one degree of its all-time temperature reading.

Around 17-18°C is normal during late June in this part of northern Ontario, which means temperatures were twice as warm as normal.

A big, anomalous upper level ridge was positioned directly over the southern tier of Hudson Bay, which allowed surface temperatures to soar.


An extreme temperature gradient developed on Monday afternoon, one with an icy onshore wind and another with a humid southerly wind. Fort Severn fell to a comparatively chilly 13°C while Peawanuck, a community just over 100 km away, tallied a high of nearly 35°C.

For reference, Peawanuck's warmest temperature in the climate record dates back to June 29th, 2002 at an unbelievable 38.1°C.


During the next couple of days, the extreme heat will remain in parts of northeastern Ontario as the upside-down pattern continues, thanks to an omega block (a blocking pattern in the atmosphere that resembles the Greek letter) in place across the continent.

The upper trough east of Lake Ontario and Lake Erie is forecast to weaken and drift into the Atlantic Ocean by Thursday, gradually warming up southern Ontario's temperatures comfortably into the low thirties.

The core of the extreme heat will slightly shift southeast, giving Moosonee a shot to be Canada's warmest city on Tuesday.