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Feeling like 40: First heat warning of the year issued in southern Ontario

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Andrea Bagley
Digital Reporter

Tuesday, August 26, 2014, 2:00 PM -

For the first time this year, Environment Canada has issued a heat warning for much of southern Ontario. 

"A hot and humid airmass will affect portions of southwestern Ontario and the Golden Horseshoe today," the heat warning reads.

EXTENDED ACTIVE WEATHER COVERAGE: Tune in to The Weather Network for live updates on the summer storms in your area. Our team of reporters and meteorologists in the field provide you with the most accurate and up-to-date coverage.

Humidex values near 40 are forecast through the afternoon with high temperatures of 30°C expected.

This could be the first time that many places see 30 degree temperatures since June.

"At Pearson Airport the high temperature has not reached 30°C since June 30th (though it has hit 29.8 C twice)," says Weather Network meteorologist Doug Gillham. "Since records started being kept at Pearson in 1937, we have not had a year in which the temperature failed to reach 30°C during both July and August."


Environment Canada says while extreme heat can put everyone at risk from heat illnesses, health risks are greatest for:

  • older adults
  • infants and young children
  • people with chronic illnesses such as breathing difficulties, heart conditions or psychiatric illnesses
  • people who work in the heat
  • people who exercise in the heat
  • people without access to air conditioning
  • homeless people.

Watch for symptoms of heat illness, which include:

  • dizziness or fainting, nausea or vomiting
  • headache
  • rapid breathing and heartbeat
  • extreme thirst
  • decreased urination with unusually dark yellow urine.

If you experience any of these symptoms during extreme heat, immediately move to a cool place and drink liquids. Water is best, EC warns.

"Drink plenty of liquids especially water before you feel thirsty to decrease your risk of dehydration. Thirst is not a good indicator of dehydration."

The high heat however, will be short lived as a cold front sweeping across the region will bring a return to seasonal temperature values for the remainder of the week.

Four things you need to know about Tuesday, August 26
Heat warning for much of southern Ontario
Strong storms ahead for Ontario

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