A fifth fatality may also have been caused by the heat, they said.
In the USA, one woman reportedly died Saturday in Pennsylvania after going into cardiac arrest due to the heat, and a 30-year-old man collapsed while running a race in NY.
"The record temperatures are expected to continue in central and eastern Canada, so make sure you know how to protect yourself and your family", Trudeau said.
The number of heat-related deaths in Montreal was pegged at six on Tuesday.
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And if the votes result in a tie, Vice President Pence will hold the tie-breaking vote-and his anti-abortion stance is well-known. And Justin Clark, the director of the Office of Public Liaison, will oversee White House coordination with outside groups.
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.
People at risk of heat-related illnesses include those with chronic illnesses, people with limited mobility or certain mental health illnesses, infants and young children, people on certain medications, and the homeless.
At least eight people in the USA and Canada have died in the past week due to the intense heat wave affecting parts of North America. The last one was in 2011 at eight days.
An extended heat warning issued by the city's medical officer of health on Sunday remains in effect.
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This media house does not correct any spelling or grammatical error within press releases and commentaries. I think this had an impact on our pace and style. "Too many interventions from the referee".
The move is part of the federal government's climate change adaptation in expectation of more frequent heat events.
"What's more unique about this is the duration", said Kelly Hobelman, a meteorologist with Environment Canada. "We are looking at temperatures 30 or above all the way until Friday". Friday is forecast to be 28 C with a 40 per cent chance of showers.
To prevent heat stress during a heat alert, Dr. Strang suggests to stay in a shaded, cool or air-conditioned area, drink plenty of water, wear light-coloured clothing and to not leave anyone or any animal unattended in vehicles.
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