'Heat dome' hits Ontario, Quebec, Maritimes as temperatures soar

A large swath of Eastern Canada is scorching under temperatures that, with the humidex, are expected to reach 40 C or higher on Friday and Saturday in some regions, in what is being called a "heat dome". The main cause for a heat dome is a long lasting area of high pressure, combining with the lingering effects of La Niña, according to the National Oceanic Atmospheric Administration (NOAA). In laymen’s terms, it gets hot, and stays hot. "When high pressure high up in the atmosphere