ENVIRONMENT CANADA
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Heat Warning in effect for:
- Newmarket - Georgina - Northern York Region
- Pickering - Oshawa - Southern Durham Region
- Uxbridge - Beaverton - Northern Durham Region
- Vaughan - Richmond Hill - Markham
A hot and humid air mass will affect south-central Ontario and the Greater Toronto Area today. Slightly cooler and less humid conditions may arrive on Monday.
Daytime high temperatures: 31 to 34 degrees Celsius
Overnight low temperatures: 20 to 24 degrees Celsius
Humidex values: low 40s today
Hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.
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.
When it's hot eat cool, light meals.
Outdoor workers should take regularly scheduled breaks in a cool place.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.
Severe thunderstorm watch in effect for:
- Newmarket - Georgina - Northern York Region
- Uxbridge - Beaverton - Northern Durham Region
Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and heavy rain.
Severe thunderstorms are possible through today as a cold front moves over Southern Ontario.
Hazards:
- Wind gusts near 100 km/h.
- Torrential downpours giving 25 to 50 mm of rain in an hour or less.
- The risk of tornadoes.
Thunderstorms are possible throughout the day before weakening and moving east of the area this evening.
Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Hail is also possible. 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!
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 [email protected] or tweet reports using #ONStorm.
For more information: http://www.emergencymanagementontario.ca/english/beprepared/beprepared.html.
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