Hurricane Fiona likely to hit Atlantic Canada as intense post-tropical storm

That post-tropical transition does not mean the storm will be weaker but will change its structure, grow in scale and cover even more territory.

Transition means storm will grow in scale and cover even more territory

Fiona likely to become very strong post-tropical storm when it hits Atlantic Canada

12 hours ago

Duration 4:04

CBC meteorologist Ryan Snoddon says post-tropical means the storm is no longer fueling itself from the water, but instead from temperature contrasts in the atmosphere. He said Fiona is still on track to bring heavy rain, strong wind and storm surge.

Hurricane Fiona has the potential to be a severe storm for parts of Atlantic Canada.

The hurricane will track northward and into Maritimes late Friday and Saturday as it transitions to a post-tropical storm.

That post-tropical transition does not mean the storm will be weaker, but its structure will change. It will grow in scale and cover even more territory.

While the "cone of uncertainty" is still quite large, it's narrowing each day. Forecast models continue to project landfall over Cape Breton or the eastern mainland of Nova Scotia.

While some uncertainty remains with the track and other details, the potential impacts are becoming more clear.

Rain will arrive well ahead of Fiona. A cold front moving in from the west will bring its own rain on through Thursday and into Friday and then begin to tap into moisture from Fiona.

The heaviest rain is expected as Fiona tracks through on Friday night and into Saturday.

The prolonged heavy rainfall will bring the potential for flooding, especially along and to the left of the track. Rainfall amounts in those areas could reach 100-150 millimetres, or even more.

With the storm growing in scale, very strong winds are expected across a large area. With the trees in full leaf, the power outage potential will be high.

Widespread gusts of more than 100 km/h are likely across central and eastern Nova Scotia, Cape Breton and P.E.I. In these areas, gusts could exceed 130 km/h, especially in exposed coastal areas.

Even in areas further to the west, gusts exceeding 70 km/h look possible.

Storm surge is also likely, however. The impact will be highly dependent on the track and timing of the storm and how it coincides with high tide. Stay tuned for more details.

It's time to prepare. Make sure your emergency kit is ready to go and your propane tank is topped up. Check that your downspouts and storm drains are clear and make sure your sump pump & generator are in working order.



Ryan Snoddon


Ryan Snoddon is CBC's meteorologist in Nova Scotia and New Brunswick.

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