Map of expanding heatwave (weather.com)Strong high pressure is building into the central plains and will slowly slide east during the weekend and into next week. This means a prolonged period of warm weather is on the way. The weekend in Montreal will be simply spectacular with bright sunshine and temperatures from 29C to 31C (85 to 88F). The warm weather will continue into next week with humidity levels on the rise and the risk for showers and thunderstorms beginning Monday.
That same ridge of high pressure will be responsible for a prolonged heatwave that will see temperatures between 30 to 40C (86 to 103F) from the northern plains and prairies into the Midwest, Northeast and middle Atlantic. Temperatures in Windsor, Ontario for example will reach 35C by next Wednesday, Gravelbourg, Saskatchewan, 34C with Montreal around 32C. Further south the hot weather will be accompanied by high humidity as well with heat index values in the 100-110F. The only relief from the heat will come along the Vermont, New York, Quebec border where a cold front could trigger some thunderstorms as early as Monday.
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