Environment Canada has tacked on a thunderstorm watch for Montreal to go along with Monday’s heat warning, which remains in effect.
“This afternoon and this evening, conditions are favourable for the development of severe thunderstorms capable of producing strong wind gusts, large hail and heavy rain,” reads the weather agency’s alert.
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The notice warns that intense lightning is “likely” with any thunderstorm that develops.
“Remember, severe thunderstorms can produce tornadoes. Lightning kills and injures Canadians every year,” continues the alert. “Remember, when thunder roars, go indoors!”
Severe thunderstorm watches are issued by Environment Canada when conditions are favourable for the development of thunderstorms that could produce large hail, damaging winds, and/or torrential rainfall.
The alert, issued in the early hours of Tuesday morning, is in effect for the following areas:
- Châteauguay – La Prairie area
- Laval area
- Longueuil – Varennes area
- Montréal Island area
As for the heat warning, the weather agency warns of a “warm and humid air mass” that will cause “oppressive heat.” “Combined values of temperature and humidity will give humidex values near 40.
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.
The risks are high for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
The heat warning advises citizens to “drink plenty of water even before you feel thirsty and Environment Canada urges people to check up on neighbours, friends, and family who may be considered vulnerable during dangerous heatwaves.