The recent heat wave has plagued central Pennsylvania with highs well into the 90s.
The adopted criteria includes a daytime temperature of 29 degrees Celsius or higher and nighttime temperature of 16 degrees or higher or a humidex of 36 degrees Celsius or higher.
"People waking up Tuesday morning might feel a bit of relief from the extreme heat of the weekend, but it is only a short cooldown", she said.
The heat warning extends throughout the GTA and most of southern Ontario, including Hamilton, Waterloo and Barrie.
In response to the extended heat warning, the city has opened a number of cooling centres around Toronto.
"What's more unique about this is the duration", said Kelly Hobelman, a meteorologist with Environment Canada.
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The city has also extended hours at eight outdoor pools during the heat wave.
The heat wave has hit the Atlantic provinces, too - a heat warning is in effect for Halifax as Nova Scotia has been experiencing temperatures of around 30 degrees, or up to 39 degrees with the humidex.
Environment Canada warns this extreme heat event will continue though for most of the week, calling this streak the most significant heat event in the past few years. The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.
Environment Canada is saying residents of southern Ontario will see some overnight relief from the heat, but daytime temperatures are expected to remain steamy.
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.