Tropical Storm Erin is forecast to strengthen into a hurricane on Friday as it tracks north of the Caribbean and intensifies into a major Category 3 storm. Here’s the latest forecast.

Weather experts on the Leeward Islands, including Puerto Rico, are keeping close watch as Erin lurches toward the Caribbean and is on track to become a major hurricane.

Tropical Storm Erin is still moving quickly westward and is forecast to become a hurricane in a few days over the central tropical Atlantic, the NHC said.