The National Hurricane Center said Wednesday that a subtropical or tropical storm may be on its way. The storm is expected to form Thursday or Friday near the U.S. Southeast coast.  They said that the storm has a 60 percent chance of forming.

The worst of the storm has been predicted to appear on Friday and continue through Saturday and Sunday, according to AccuWeather. The storm should reach the Carolina shores Friday night or Saturday if it forms. Thunderstorms, rains, rough surfs, minor beach erosion and powerful winds could appear as a result of the storm, according to USA Today.

The impacts of subtropical and tropical storms are essentially identical. A subtropical storm is a hybrid between a tropical and non-tropical storm.

As of now, the storm is simply a group of thunderstorms and rains. However, the Miami Herald reported that the storm is “more likely” to become the first system of this year’s hurricane season.

And the hurricane center stated that if the storm’s sustained winds reach 39 mph, then the storm will be called Tropical Storm–or subtropical–Ana, and it will be the first in the Atlantic in 2015.

Since weak winds are steering, the storm’s movement is expected to be slow. This means that the coast could be affected for several days, according to the Roanoke Times.

It is early in the year for a tropical storm to brew. Hurricane season is set to begin on June 1, 2015. Meteorologist Stu Ostro of the Weather Channel said that this would be one of the earliest tropical or subtropical storms to hit the U.S. on record.

Early storms are not common, but they cannot be ruled out either. In 2012, Tropical Storm Beryl stormed from off the Carolinas to Florida. It hit the coast of Florida on May 30, 2012; it was almost a hurricane since its winds reached 70 mph.