Arthur will is expected to slam into Nova Scotia with strong winds, heavy rain and rough seas on Saturday.
Arthur will bring damaging wind gusts, heavy rain and pounding surf to Nova Scotia, Prince Edward Island and New Brunswick.
Winds will be strong enough to knock down trees, produce power outages and cause minor property damage, especially along the coast.
Small craft are urged be in position to get to safe harbor quickly Friday afternoon and evening and to remain in port on Saturday.
The rain will be falling at a fast enough pace to cause flash flooding and could cause washouts and mudslides on secondary roads.
While Arthur will undergo transformation and weaken over the cold waters of the North Atlantic, it will still be a large storm with a strong circulation.
According to Canada Weather Expert Brett Anderson, "Arthur will be a potent, fast-moving storm regardless of official classification when it hits Nova Scotia on Saturday."
Arthur will bring locally gusty winds and drenching showers to Newfoundland and southeastern Labrador Saturday night into Sunday.
Gusts to 120 kph are forecast over coastal Nova Scotia, over the Bay of Fundy and the southern part of the Gulf of St. Lawrence.
"The heaviest rain will fall on the northern and western side of the storm center and is likely to fall over New Brunswick," Anderson said. The heaviest will fall Saturday morning during an eight-hour period.
The storm will cause seas to rise quickly and get rough over nearby waters including the Gulf of St. Lawrence and the Bay of Fundy. A storm surge of 1 meter is forecast along the southwest coast of Nova Scotia Saturday morning. Away from the coast, seas can reach 7 m along the south coast of Nova Scotia.
"People will want to consider having batteries on hand or make sure their generator is fueled and ready to run," Anderson said.
As millions prepare to take part in Memorial Day weekend events, showers, storms and a potential tropical system could threaten outdoor activities and travel plans during the extended weekend.
An area of showers and thunderstorms northeast of the Bahamas has the potential to develop into a tropical system at any time and impact part of the East Coast of the United States during Memorial Day weekend.
Severe weather, including the risk of tornadoes and flash flooding, will continue into Memorial Day weekend.
Rainy weather will help to lessen the severity of the drought around Colombia and Venezuela in the coming months while drier-than-normal conditions make matters worse for the drought in Chile and northeastern Brazil.
Violent storms whirled through the central United States this week, spawning large tornadoes on multiple days.
This weekend will be the biggest racing weekend of the year with three major races drawing in millions of viewers from around the globe.