Tropical Storm Erin formed in the eastern Atlantic Ocean on Monday, forecasters said. The storm could strengthen to become the Atlantic's first hurricane of the season.

As Erin continues to churn over very warm water, the storm will gain quick momentum and will likely become the first major hurricane (a category 3, 4 or 5 storm) as early as this weekend as it passes to the north of Puerto Rico.

Erin developed in the eastern Atlantic, moving westward from the Cabo Verde Islands at about 20 mph (32 km/h). Infrared sensors on NOAA's GOES-19 satellite reveal colder cloud tops and deep convection near the center — signs of a strengthening system feeding on warm ocean waters.

Hurricane Erin became the first hurricane of the 2025 Atlantic season on Friday, with sustained winds of 75 mph as it moves toward the Leeward Islands.

Tropical Storm Erin is approaching Puerto Rico and the Virgin Islands, bringing heavy rains that could cause flooding and landslides