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Power outages expected in Maine as Hurricane Fiona barrels up the coast

The latest forecast calls for the strongest storm in history to hit the Canadian Maritimes.
Credit: Jason Nappi

PORTLAND, Maine — What is "bombogenesis?"

According to the National Oceanic and Atmospheric Administration, it's a "midlatitude cyclone that rapidly intensifies, dropping at least 24 mb in 24 hours."
That's what you see below with the isobars tightly wrapped next to each other. An observed mean sea level pressure of 930 mb or lower would easily be the strongest Atlantic extratropical storm on record. 

Credit: Jason Nappi

The only good news for Mainers is the wind from Fiona will be mostly just to the east as seen below with the bright colors over Nova Scotia. They will get a direct hit and it could be devastating. Northern New England will be spared from the worst of the storm. 

 

Credit: Jason Nappi

However, bombogenesis is exactly what hurricane Fiona will do when it transitions from a major hurricane into an extratropical cyclone Friday into Saturday. The warm core of the tropical cyclone will interact with a trough in the atmosphere. Simply put, the cold air in the upper level trough behind the cold front will collide with the warm air of the hurricane in the Atlantic Ocean. 

Credit: NWS

As Fiona turns into a cold core system, its wind field will expand. That means eastern Maine has the potential for tropical storm winds Friday night into Saturday.

Credit: Jason Nappi

The good news is all computer model tracks take Fiona east of Halifax.

Credit: Jason Nappi

The official forecast from the National Hurricane Center has Fiona maintaining category "major" status southeast of Halifax, Nova Scotia, Friday night and making landfall on the eastern tip by Saturday morning at 9 a.m.

Credit: Jason Nappi

Get Ready: Wind gusts up to 50 mph bring a power outage threat for parts of Maine.

Credit: Jason Nappi

The tight gradient created by Fiona and high pressure to our west will create power outage damaging wind gusts for the foothills, mountains, and Down East Maine on Saturday.

Credit: Jason Nappi

Surf's up: Five- to 10-foot waves from a few hundred miles offshore "Cat 3" Fiona will crash Maine beaches this weekend. 

Here is the latest forecast from the NWS for Saturday: 

Credit: Jason Nappi

The National Weather Service has issued a Gale Watch for Friday afternoon into Saturday afternoon for Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM- Penobscot Bay- Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM-Casco Bay- Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM. The official forecast calls for 6 to 9 foot waves with wind gusts up to 40 kt on Friday and Saturday. 

Will you be going to the beaches to peep the big waves? 

Let me know on my social media by clicking on my Facebook or Twitter

- Meteorologist Jason Nappi 

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