Dorian strengthened into a Category 1 hurricane—wind speeds of between 74 and 95 miles per hour—on Wednesday shortly before it arrived at the U.S. and British Virgin Islands, where it caused power outages and minor flooding, the Associated Press reported.

The storm also passed by Puerto Rico, although it caused relatively little damage as the territory avoided a direct hit—although minor fooding and power outages were also reported on the islands of Vieques and Culebra.

Dorian’s center was located around 150 miles north-northwest of San Juan, Puerto Rico as of 5 a.m. on Thursday, although hurricane-force and tropical-storm-force winds extended outwards up to 15 and 90 miles from the center respectively, according to the National Hurricane Center (NHC.)

“Dorian is moving toward the northwest near 13 miles per hour and this general motion is expected to continue through Friday,” a statement from the NHC read. “A west-northwestward motion is forecast to begin Friday night and continue into the weekend. On this track, Dorian should move over the Atlantic well east of the southeastern and central Bahamas today and on Friday, and approach the northwestern Bahamas on Saturday.”

“Maximum sustained winds are near 85 miles per hour with higher gusts,” the statement read. “Strengthening is forecast during the next few days, and Dorian is expected to become a major hurricane on Friday.”

Forecasters say it is possible that Dorian could strike Florida or Georgia as a Category 3 hurricane—wind speeds of between 111 and 129 miles per hour—by Monday, although at present it is not clear exactly where hurricane conditions may be felt.

The NHC says that there is a risk of dangerous storm surges later this week in the central and northwestern Bahamas, and along the east coast of Florida as Dorian advances.

“Residents in these areas should ensure they have their hurricane plan in place and not focus on the the exact forecast track of Dorian’s center,” the NHC statement read.

The Bahamas, Florida and other portions of the southeastern United States are expected to be hit with heavy rain later this week and early next week. The NHC predicts that the central Bahamas could see between 2 and 4 inches of rain, with isolated totals of 6 inches. Meanwhile, the northwestern Bahamas and coastal sections of the U.S. southeast may received between 4 and 8 inches, with with isolated totals of 12 inches.

This heavy rainfall has the potential to cause life-threatening flash-floods in these areas, according to the NHC.