Maritimes Weather Warnings: Rare May nor'easter targets Atlantic Canada Sunday
Maritimes weather warnings are centered on a rare May nor'easter set to move into Atlantic Canada on Sunday, bringing heavy rain, damaging winds, localized flooding, and some snow. The system is drawing strength from a deep trough over Eastern Canada and a weak frontal boundary drifting off the U.S. East Coast.
Nova Scotia is expected to take the heaviest rain, with Halifax and Yarmouth forecast for 30-50 mm. Cape Breton could see winds of 70-90 km/h before dawn Monday, while western Newfoundland is expected to receive more than 30 mm of rainfall on Monday.
Nova Scotia and Cape Breton
The storm’s winds are expected to begin picking up in Nova Scotia Sunday evening and continue moving north across the East Coast overnight into Monday. Localized flooding from heavy rains is possible late Sunday and into Monday, along with power outages from gusty winds.
Cape Breton could see the strongest winds in the region before dawn Monday. Temperatures across the Maritime provinces will hover only a few degrees above freezing Sunday night, keeping some places close to the line between rain and snow.
Eastern Nova Scotia and Cobequid Pass
Wet snow is more likely as the nor'easter crosses eastern Nova Scotia. More snow is likely across higher terrains in western Prince Edward Island, New Brunswick, and northern Nova Scotia, including Cape Breton, though no significant snow accumulation is forecast in those higher terrain areas.
About 5 cm of snow may fall along the Cobequid Pass. Large waves along coastal areas will also increase danger for beachgoers and ocean-admirers as the storm moves through.
Atlantic Canada Sunday
The system stands out because late-spring nor'easters are rarer than winter storms, when the temperature differences needed to build them are more common. Below-seasonal temperatures in Eastern Canada created conditions that fit more early April than early May, setting the stage for this one.
That means the weather shift is not just rain for one province. It is a multi-hazard system crossing the Maritimes and into Newfoundland, with the highest impacts expected first in Nova Scotia and then across the region through Monday.
