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Heat warning, thunderstorm watch continue overnight

Beware of heat illness symptoms and stay cool
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Heat Warning in effect for:
  • Elliot Lake - Ranger Lake
  • Espanola - Killarney
  • Manitoulin Island

A heat event for the Canada Day long weekend.

Southwest winds will bring hot and humid air from the Gulf of Mexico. Daytime high temperatures near 30 degrees are forecast, with humidex values in the mid to high thirties. Low temperatures overnight are expected to be in the high teens to low twenties providing little relief from the heat. Areas near the lake shores will be cooler.

Slightly cooler conditions will likely arrive late Sunday as a cold front is expected to move through the region.

Extreme heat affects everyone.

The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.

Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.

Never leave people or pets inside a parked vehicle.

Severe thunderstorm watch in effect for:

  • Elliot Lake - Ranger Lake
  • Espanola - Killarney
  • Manitoulin Island

The threat of severe thunderstorms will persist through tonight

Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Remember, severe thunderstorms can produce tornadoes. Heavy downpours can cause flash floods and water pooling on roads. Lightning kills and injures Canadians every year. Remember, when thunder roars, go indoors!

Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.