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Isolated tornado part of Friday's severe risk for Maritimes


Erin Wenckstern
Meteorologist

Friday, July 21, 2017, 7:29 PM - With the Maritimes under a hot and humid airmass, an approaching cold front and upper level energy will destabilize the atmosphere, providing the risk for severe thunderstorms Friday.

While the best instability and greatest dynamics do not exactly coincide perfectly, there is a window of opportunity in the afternoon and evening where the two meet up.

A cold front began to descend from the north during the late morning/early afternoon hours for northern New Brunswick. Along the front, a broken line of thunderstorms brought the main threat of heavy downpours to the north. As the front begins to sag south, a lot of instability will already be in place across southern and central New Brunswick, and into Nova Scotia and P.E.I.


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This instability, combined with veering wind profiles could lead to the development of severe weather, including strong wind gusts, small to moderate hail, torrential downpours and potentially an isolated tornado.

Given the temperature contrast from the Bay of Fundy and Atlantic Ocean compared to the interior where daytime highs will be in the high 20s and low 30s, this will set up a strong sea breeze through southern New Brunswick and the interior of Nova Scotia. This will aid in the intensification of storms that do develop.

The severe threat also extends into Nova Scotia for the evening hours, as well as P.E.I.

It’s important to note that while the risk is widespread, the nature of these storms is more isolated to scattered, so not everyone will see a storm. However, it's best to err on the side of caution.

Looking ahead, much cooler weather spreads into Atlantic Canada for much of next week. Forecasters are watching for a potent and slow moving system that is expected to track into the Maritimes Monday and Tuesday, with showers and thunderstorms.

Check back for updates as we continue to monitor the forecast.

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