Erin becomes a Category 4 hurricane in Caribbean
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Fox Weather on MSNTropical Storm Erin expected to become a hurricane Friday as Tropical Storm Watches in effect for Caribbean
Tropical Storm Erin is on the cusp of strengthening into a hurricane, which it is expected to become later this Friday, as it bears down on the northern Caribbean islands.
The National Hurricane Center expects this storm to gradually strengthen over the next day or so, but also warned of its potential to rapidly intensify within the next 24 to 48 hours.