Tuesday, April 20, 2021

Heat warning, showers, thunderstorm risk, high 31°C, humidex 39°C, UV index 11

Today – June 10, 2020

Sunny early this morning then a mix of sun and cloud with 40 percent chance of showers. Risk of thunderstorms. Wind south 20 km/h gusting to 40 becoming southwest 40 gusting to 60 this morning. High 31 except 25 near Lake Erie. Humidex 39 except 33 near Lake Erie. UV index 11 or extreme.


Showers with thunderstorms ending near midnight then partly cloudy. Amount 20 to 30 mm. Wind southwest 50 km/h gusting to 80 diminishing to 30 gusting to 50 this evening. Low 15.

Heat warning

Heat event continues today.

Temperatures today will reach 30 or 31 degrees Celsius across the region in a hot and humid tropical air mass. Humidex values will reach the mid to upper thirties this afternoon.

Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index to approach the high risk category.

A cold front accompanied by showers and thunderstorms will move through Southern Ontario tonight, bringing this heat event to an end.

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.

Never leave people or pets inside a parked vehicle.

Outdoor workers should take regularly scheduled breaks in a cool place.

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

Thu, 11 Jun – A mix of sun and cloud with 30 percent chance of showers in the morning. Clearing in the afternoon. Wind west 20 km/h gusting to 40. High 23. Humidex 26. Night – Clear. Low 16.

Fri, 12 Jun – Sunny. High 20. Night – Clear. Low 11.

Sat, 13 Jun – Sunny. High 20. Night – Clear. Low 11.

Sun, 14 Jun – Sunny. High 21. Night – Clear. Low 13.

Mon, 15 Jun – Sunny. High 21. Night – Clear. Low 16.

Tue, 16 Jun – Sunny. High 25.

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