Dangerous heat and humidity beginning Sunday afternoon.
The first significant heat event of the season with dangerously hot and humid conditions will begin Sunday afternoon and is expected to continue into the week.
What:
Daytime highs of 31 to 36 degrees Celsius.
Humidex values of 40 to 45.
Overnight lows of 21 to 25 degrees Celsius, providing little relief from the heat.
When:
Sunday afternoon to Tuesday night.
Additional information:
The extreme heat and humidity may continue into Wednesday. A cold front is expected to push through the region late Tuesday but there is some uncertainty with how far south this front will get. Should it remain farther north, the heat event may continue for Wednesday primarily for southwestern Ontario and the GTA.
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For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.
Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.
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.
Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. 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.
Drink water often and before you feel thirsty to replace fluids.
Close blinds, or shades and open windows if outside is cooler than inside.
Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.
Follow the advice of your region’s public health authority.
Plan and schedule outdoor activities during the coolest parts of the day.
Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat.
Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.
Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and heavy rain.
Hazards:
Wind gusts up to 90 km/h.
Heavy rainfall.
When:
This afternoon.
Additional information:
An area of strong thunderstorms moving southeast over Lake Huron and Georgian Bay may affect the area.
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Strong wind gusts can damage trees, buildings and overturn vehicles.
Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.
For more information: https://www.ontario.ca/page/be-prepared-emergency.
When thunder roars, go indoors! Lightning kills and injures Canadians every year.
Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.