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What is so rare as a day in June? How about the day before June begins becoming one for the record books? The city is under another heat alert, the second one called this spring. Temperatures are expected to touch the 30C mark Thursday, and the heat could trigger some thunderstorms. Some could be heavy at times, with Environment Canada warning of tornados in some parts of the province, but cancelling a severe storm alert for Newmarket, Caledon and northern York Region.
But unlike a cold shower, all that precipitation won't do much to cool things off. The week is expected to end with another scorcher, with the mercury edging back up to the 29C mark on Friday and staying near that for Saturday. Add to that high humidex values close to 37 and we'll feel a lot more like the middle of July than the end of May.
Heat alerts are called when the city believes the extreme conditions pose a threat to those most vulnerable, like the elderly or people with respiratory problems. They're already having a hard enough time coping with the pollution. Much of the province is under a smog advisory and Mother Nature's furnace and her light winds are expected to make the problems worse over the next few days.
By the time we hit Thursday afternoon, parts of the city were registering an air quality index close to 50, at or near the poor threshold. Other areas of the GTA were gasping through a similar choking haze, but we're still getting off easy. Sarnia recorded a smothering AQI of 64 in the morning, while Kitchener coped with a very poor 60. (Find your area.)
The smog and heat will continue into Saturday when we reach 27C - and all that warmth will make the risk of thunderstorms a real possibility. And it will feel much cooler - and just as damp - by Sunday and Monday. And if the forecast holds (check it here), this won't come as any surprise - after a wet weekend, we'll be right back to sunshine and nice temperatures just in time for you to go back to work.
If you have any questions about surviving in these conditions, the Red Cross Heat Information Line at (416) 480-2615 isopen from 9am-9pm.
What do the humidex readings mean?
  • Less than 29: No discomfort
  • 30 to 39: Some discomfort
  • 40 to 45: Great discomfort; avoid exertion
  • Above 45: Dangerous
  • Above 54: Heat stroke imminent
  • Less than 29: No discomfort
  • 30 to 39: Some discomfort
  • 40 to 45: Great discomfort; avoid exertion
  • Above 45: Dangerous
  • Above 54: Heat stroke imminent
 
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