Tropical Storm Jose forms east of Hurricane Irma

Both islands are part of the northern Leeward Islands, and are under a hurricane warning as Irma approaches the region.

As of 10 a.m. CDT Tuesday, the newly named Tropical Storm Jose was located about 1,505 miles east of the Lesser Antilles and was moving to the west-northwest at 13 mph.

Jose is moving west-northwest at about 13 miles per hour and is expected to speed up in the next two days.

Irma is the most powerful hurricane to have formed outside of the Caribbean and Gulf of Mexico since record keeping began, NOAA says.

Irma is a potentially catastrophic Category 5 hurricane and will bring life-threatening wind, storm surge and rainfall hazards to portions of the northeastern Leeward Islands beginning later Tuesday and the Virgin Islands and Puerto Rico beginning Wednesday, the National Hurricane Center says.

The National Weather Service in Miami said the window of greatest concern is Friday through Monday.

The forecast track of Tropical Storm Jose on September 4, 2017.

Irma's future, and that of the USA coastline, is dependent on two atmospheric features: the Bermuda High and an upper-level low moving west to east through the central U.S. If Irma misses the upper-level low, it could travel further west on a track that has it making an abrupt right turn into the Keys and the tip of the state. "The good news is, Floridians still have time to prepare".

Jose, the 10th named storm so far this season, had winds of 40 miles per hour.

Formation chance through 48 hours: 60 percent.