The International Red Cross estimates that about 4.2 million people were affected by the back-to-back Category 4 hurricanes in November in Honduras, Nicaragua and Guatemala.
Iota has weakened from a hurricane to a tropical storm with maximum sustained winds of 80 kph after leaving at least six dead in Nicaragua.
Along with heavy winds and rain, Iota will raise sea levels by as much as 6 metres above normal tides. It is expected to quickly weaken inland, but will dump as much as 76 cm of rain over the next few days.
Eta regains hurricane strength off Florida and is expected to make landfall on Thursday, says US National Hurricane Center.
The Nicaraguan government reports no immediate fatalities, but authorities in Honduras say a child died in a collapsed house, as Eta unleashes fierce winds, tearing up trees and ripping roofs off homes.
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