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Forecasters have described Erika, the fifth named storm of the Atlantic hurricane season, as unusually hard to predict due to disruption from wind patterns and interaction with land, which weakens a storm, as well as warm water, which adds energy.

Tropical Storm Erika continued to strengthen as it dumped torrential rainfall on islands in the Eastern Caribbean and appeared to be headed for the US East Coast early next week, the US National Hurricane Center said on Thursday.