Irene moves over Caribbean, seen becoming hurricane
Northwestward path over Caribbean could threaten Florida
Caribbean islands issue tropical storm warnings
Harvey over northern Guatemala, seen weakening (Updates position of Irene, adds Harvey weakening)
MIAMI, Aug 20 (Reuters) - Tropical Storm Irene formed east of the Leeward Islands on Saturday and was expected to become a hurricane in the next two days heading on a northwestward track through the Caribbean that may threaten Florida.
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