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Or sign-in if you have an account.Temperatures are expected to climb up to 37 C in some areas of southern Ontario. Photo by Jack Boland /Jack Boland/Toronto SunEnvironment Canada has issued weather alerts across the country as temperatures as high as 37 C are expected to arrive this week.Enjoy the latest local, national and international news.Exclusive articles by Conrad Black, Barbara Kay and others. Plus, special edition NP Platformed and First Reading newsletters and virtual events.Unlimited online access to National Post.National Post ePaper, an electronic replica of the print edition to view on any device, share and comment on.Daily puzzles including the New York Times Crossword.Support local journalism.Enjoy the latest local, national and international news.Exclusive articles by Conrad Black, Barbara Kay and others. Plus, special edition NP Platformed and First Reading newsletters and virtual events.Unlimited online access to National Post.National Post ePaper, an electronic replica of the print edition to view on any device, share and comment on.Daily puzzles including the New York Times Crossword.Support local journalism.Create an account or sign in to continue with your reading experience.Access articles from across Canada with one account.Share your thoughts and join the conversation in the comments.Enjoy additional articles per month.Get email updates from your favourite authors.Create an account or sign in to continue with your reading experience.Access articles from across Canada with one accountShare your thoughts and join the conversation in the commentsEnjoy additional articles per monthGet email updates from your favourite authorsSign In or Create an AccountorThe warnings, which cover Alberta, Ontario, Quebec and a handful of areas in the Northwest Territories and Saskatchewan, are classified as either yellow or orange, depending on how high temperatures are expected to soar.Environment Canada says these warnings are put in place when hazardous weather may cause damage, disruption, or health impacts. For yellow warnings, impacts are moderate, localized and/or short-term, while orange warnings indicate major impacts that are widespread and/or may last a few days.Red warnings are in place when severe weather is potentially life-threatening. These warnings are rare, and there currently aren’t any in place.Get a dash of perspective along with the trending news of the day in a very readable format.By signing up you consent to receive the above newsletter from Postmedia Network Inc.A welcome email is on its way. If you don't see it, please check your junk folder.The next issue of NP Posted will soon be in your inbox.We encountered an issue signing you up. Please try againIn Ontario, there were 38 orange warnings for heat at the time of writing, as well as 40 yellow warnings. Alberta has 31 yellow heat warnings in place, while there are seven in the Northwest Territories, 60 in Quebec and four in Saskatchewan.Temperatures are expected to climb up to 37 C in some areas of southern Ontario, while the humidex, which is used to describe how hot the weather feels to the average person, is expected to exceed 40 C.In the Northwest Territories, several areas are expected to see temperatures of 30 C, while Quebec will see daytime highs of 33 C and humidex values of up to 44. Four areas in Saskatchewan are expected to hit 29 C.In most areas, these conditions are expected to continue until Friday, and possibly into the weekend.In Alberta, where most of the warnings are concentrated in the north around Lac la Biche, MacKenzie County and Wood Buffalo, with highs of 30 C are not expected to continue past Thursday.Environment Canada offers advice on protection during periods of extreme heat. “Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water,” the agency says.Meanwhile, signs of heatstroke can include red and hot skin, dizziness, nausea, confusion and a change in mental state or behaviour. In these instances, Environment Canada says to call 9-1-1 or your emergency health provider.“While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body,” it says.It also reminds Canadians to check on older adults, those living alone and other at-risk people either in-person or on the phone multiple times a day.The weather comes as Europe remains in the grip of a record-breaking heatwave that triggered school closures, travel disruption, flash flooding and crop damage. France has reported 1,000 excess deaths during the heatwave.Elsewhere, Environment Canada has issued orange warnings for rainfall across Manitoba and Saskatchewan, while several areas in Ontario have been placed under yellow warning or yellow watch for severe thunderstorms.Environment Canada explains that a yellow watch means “conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.”Some areas in Quebec and Alberta are also under a yellow watch for severe thunderstorms, as well as British Columbia and Newfoundland and Labrador.Our website is the place for the latest breaking news, exclusive scoops, longreads and provocative commentary. Please bookmark nationalpost.com and sign up for our daily newsletter, Posted, here. Join the Conversation This website uses cookies to personalize your content (including ads), and allows us to analyze our traffic. Read more about cookies here. 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