Updated at 10 a.m. ET on Aug. 13, 2025.

Tropical Storm Erin is still struggling to strengthen, but it has a well-developed circulation. Dry and dusty air surrounds the system, and the ocean below is cool. However, conditions are forecast to be much more conducive to strengthening ahead.

The National Hurricane Center is forecasting Erin to slowly strengthen, reaching hurricane strength late tomorrow or early Friday. Though the exact timing when the atmosphere around the system will moisten up, allowing it to spin up, is only an approximation.

Importantly, Erin's center is forecast to make its closest approach to the northeastern Caribbean islands, including Puerto Rico and the Virgin Islands over the weekend. The consensus of the various computer models and the NHC official forecast pred

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