Half of Canada may see a cooler June start with help from a typhoon

A former typhoon in the western Pacific will help bring a cooler pattern to parts of Canada by the end of next week, meaning June won't have the hot start millions of folks were hoping for

Once a typhoon, Ewiniar is slowly tracking and weakening just east of Japan as a tropical storm after its deadly impacts in the Philippines.

Named on May 24, Ewiniar was one of the first designated storms in the Northern Hemisphere this year.

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With respect to this country, its location and track will eventually have an impact on Canada's weather pattern as we head into June.

Track of Ewiniar May 29

But we can't blame the typhoon for the pattern change that is coming.

Instead, the track will increase our confidence in a pattern change by the second week of June.

The expected pattern a week after Ewiniar takes that track just east of Japan is a ridge in the West and a trough in the East, in the vicinity of the Great Lakes, and that's what the models continue to show.

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Ridging in the West would bring above-normal temperatures and drier weather conditions, with a period of true summer-like weather.

Upper-level pattern for Canada for June 6 (May 29)

So that means the opposite is true in the East. Troughing is a signal for unsettled conditions and below-seasonal temperatures. The Great Lakes may be in store for a brief interruption of summer weather with a period of cooler conditions.

How long could this last? It’s uncertain.

The typhoon’s track could reinforce the incoming pattern by making it stronger or extending its staying power into mid-month.

Temperature pattern Canada for June 6 (May 29)

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At least seven people were killed by Ewiniar, which hit the Philippines on the weekend, authorities said in a Reuters report. Nearly 27,000 people were impacted by the storm, which disrupted the operations of three airports and nine seaports.

With files from Rachel Modestino, a meteorologist at The Weather Network, and Reuters.