Friday, June 16, 2017

Muggy weekend ahead for southern Ontario and Quebec

A strong cold front with slam into the warm and humid air mass across southern Quebec and Ontario by Sunday afternoon. Strong thunderstorms are likely for several regions. (
A warm front is in the process of lifting north across the St. Lawrence Valley Friday afternoon, after dumping up to 25mm (1 inch) of rain on the region. Behind the front, warm and humid air will begin to pour into southern Quebec. Temperatures were around 18C (65F) in Montreal on Friday, but Toronto was up to 30C (86F). This is an indication of how warm the air is behind the front. Saturday will feature mainly sunny skies, with temperatures approaching 30C in Montreal along with elevated humidity values. Combined with the high humidity, it will feel more like the upper 30s both Saturday and Sunday. Conditions will be even warmer on Sunday, with high temperatures in the low 30s (upper 80s and low 90s) in portions of Quebec, Ontario and especially across northern New York and New England. Overnight lows Saturday will remain warm in Montreal, near 21C (70F). Conditions will feel quite uncomfortable for sleeping.

A strong cold front will plow into the moist, unstable air beginning late Sunday. Strong to potentially severe thunderstorms are possible, with heavy rain, gusty winds and hail. The storms are expected to develop in southern Ontario early Sunday, and reach Ottawa and Montreal by the evening. Showers and thunderstorms will persist into Monday in southern Quebec, along with the muggy air. Some relief will arrive by Tuesday with cooler and less humid conditions expected. If you have plans outdoors on Sunday, be sure to listen to the latest forecast concerning the severe weather potential.

Be lightning savvy, remember, When The Thunder Roars, Go Indoors.

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