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Kalin's Call: Rain, risk of thunderstorms for Maritime region Friday into Saturday

A file image of lightning. (Adobe Stock/CNN) A file image of lightning. (Adobe Stock/CNN)
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A series of weather fronts off a low-pressure system moving towards the St. Lawrence River Valley will cross the Maritimes Friday into Saturday, bringing with it periods of rain and a risk of thunderstorms.

For Friday, the steadiest rain is expected in northern New Brunswick, Prince Edward Island, and northern/eastern areas of Nova Scotia, including the North Shore and Cape Breton. Precipitation will be more showery, along with patchy drizzle and fog, for southern New Brunswick and western Nova Scotia.

The steadiest rain on Friday will be in northern and eastern parts of the Maritimes. Showery with drizzle for southern New Brunswick and western Nova Scotia.

On Saturday, the cold front comes through bringing further periods of rain region-wide and a risk of thunderstorms. Thunderstorms are most likely in New Brunswick and southwestern Nova Scotia.

The most likely hazards from the thunderstorms will be downpours and frequent lightning. The risk for thunderstorms extends from Saturday morning into Saturday evening.

Darker greens and yellows indicating possible downpours within the rain Saturday. There is a risk of thunderstorms.

Friday through Saturday could see rain totals of 50 to 75 millimetres for northern areas of New Brunswick. Environment Canada has already issued rainfall warnings on the Quebec side of the border, and for Madawaska and Restigouche counties in northern New Brunswick.

Rain totals of 20 to 40 millimetres are possible for P.E.I., and parts of northern/eastern Nova Scotia through the same period of time. Rain should generally total 20 millimetres or lower for southern New Brunswick and western Nova Scotia.

Heavy rain can reduce visibility and lead to water pooling on roads. The presence of thunderstorms increases the risk of the occurrence of flash flooding.

Widespread rainfall totals reaching or exceeding 50 millimetres are being indicated for northern New Brunswick Friday through Saturday.

The last of the rain will clear P.E.I., and Cape Breton early Sunday morning. A fair weather mix of sun and cloud is expected to be present across the region by Sunday afternoon.

The Maritime region has so far run a deficit when it comes to rain in May 2022. Weather stations across the region are reporting less than half the 30-year climate average for total rainfall this month.

It’s been a dry month. Rain totals for May well below the 30-year climate average.

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