Line of 'nasty storms' take aim at southern Ontario, Quebec on Canada Day
Monday, June 30, 2014, 10:12 -
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A hot, humid air mass will set the stage for storms across Southern Ontario and Quebec on Canada Day.
Storms that prompted tornado warnings through central and northeastern Ontario will weaken overnight. However, our forecast team will be watching a nasty line of storms racing out of the US towards southwestern Ontario. This is already being called a "Derecho" in the US – a term used to describe a family of thunderstorms that produces a large area of wind damage. While this line will start to weaken by the time it approaches the border, these storms could still pack a punch in the wee hours of the morning along the shoreline of Lake Huron all the way to Windsor.
This line of storms will continue to weaken through the morning hours on Canada Day, but may still provide for some showers across the GTA to start the day. A more intense band of rain with embedded storms is likely through cottage country towards North Bay.
The focus for severe thunderstorms Tuesday afternoon and evening will be across eastern Ontario and southern Quebec.
The nation’s capital is in the bulls-eye of the threat zone. While there is no guarantee a storm will hit Ottawa during the afternoon, anyone attending Canada Day celebrations should keep a close eye on weather conditions and be ready to take shelter if storms do indeed develop. The Ottawa and St. Lawrence Valleys, including Montreal, will be the target zone for the most widespread thunderstorm activity.
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Areas from Georgian Bay through the GTA to Niagara may escape the worst, but a few scattered storms are not out of the question during the afternoon hours.
Storms across all these regions should move east in time for fireworks.
Be sure to visit our Alerts page for updated watches and warnings.