Heat dome brings dangerous temperatures. Here's how to stay safe

As parts of southern Ontario, Quebec and the eastern United States swelter through a heat dome, here are the health warning signs to watch out for — and how to keep cool.

As parts of southern Ontario, Quebec and the eastern United States swelter through a heat dome, here are the health warning signs to watch out for — and how to keep cool.

As parts of southern Ontario, Quebec and the eastern United States swelter through a heat dome, here are the health warning signs to watch out for — and how to keep cool.