Toronto and Metrolinx issue heat warnings for the Canada Day long weekend

Toronto and Metrolinx issue heat warnings for the Canada Day long weekend

Canada Day visitors to Ottawa will be greeted by an extreme heat wave this weekend.

"What we're seeing in parts of central Ontario are probably very close to record amounts of humidex", said David Phillips, senior climatologist from Environment Canada, noting Canada Day revelers on Parliament Hill in Ottawa could witness the hottest July 1 in 55 years.

A heat warning issued by Environment Canada remains in effect for the entire region.

Temperatures on Saturday and into next week are expected to be in the mid-30s and, with the humidity, it will feel like the mid-40s.

The temperatures will be "sultry" and "oppressive", he told CTV Barrie on Thursday.

The weather agency says this will be the most significant heat event in the past few years.

Over the long weekend, the heat will drop slightly in the evening, falling to the low to mid-twenties, providing "little or no relief from the heat".

During periods of extreme heat, people are advised to practice measures such as staying hydrated, limiting outdoor activity and staying in cool or shaded areas whenever possible and wearing a brimmed hat, sunscreen and loose fitting clothing when outdoors.

A huge air mass travelling from the Gulf of Mexico has moved north and will be affecting eastern Canada, southern Ontario, Quebec, and even the Maritimes.

Drink plenty of fluids throughout the day, preferably water and limit or avoid caffeine and alcohol.

"Sunday and Monday will be especially humid, with highs in the low- to mid-thirties and humidex values exceeding 40", says a special weather statement issued for Metro Montreal and Laval.

"Current indications suggest hot temperatures could persist through the next week", the warning reads.