Significant heat risk builds across Ontario into next week
Prepare for several days of high temperatures and tropical humidity into next week
A heat dome building over the United States will affect Ontario heading into next week, which will crank up the heat and humidity across the Great Lakes region.
Humidex values could easily push into the 40s at times thanks to the tropical mugginess expected to accompany the high temperatures.
Many folks have outdoor plans for Canada Day next week. Excessive heat is a sneaky danger. Even a relatively healthy individual can succumb to heat-related illnesses without proper precautions.
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Heat dome south of the border sends temperatures soaring
A significant heat dome building over the United States into next week will drive our soaring heat and humidity across southern Ontario to close out June.
Heat domes are strong, nearly stationary ridges of high pressure that can trap hot air beneath them, resulting in a multi-day heat wave for the affected areas.
This upcoming heat dome is expected to set up over the southern and eastern U.S., with the northern edge of the ridge jutting into the Great Lakes region.
Folks across southern Ontario can expect impacts to begin as early as Sunday and continue through at least Canada Day on Wednesday.
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Rounds of hot, muggy weather will rotate around this centre of high pressure, pushing humidex values into the upper 30s and lower 40s across southern Ontario, including the Greater Toronto Area.
Expect the heat to peak on or around Canada Day, with impacts potentially lasting into the following weekend. We’ll see the stateside heat dome retreat heading into the second week of July.
Southern Ontario will have to watch the potential for organized clusters of thunderstorms to ride around the edge of the heat ridge like train cars on railroad tracks. The exact location and strength of the potential storm activity remains uncertain this far out.