Guatemala, Honduras and El Salvador account for the majority of migrants arriving at the US southern border as gang violence and lack of economic opportunities are the main reasons migrants give for leaving.
Honduran migrants clashed with Guatemalan police who fired tear gas to those trying to cross into the US.
Several thousand Honduran migrants, driven by deepening poverty and unemployment, begin walking toward Guatemala in hope of warm reception by US authorities under Joe Biden's administration.
US-Mexico border is a major crossing point for migrants fleeing poverty, drug-related violence and other woes in Mexico and Central America.
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.
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.
Iota expected to bring potentially catastrophic winds, life-threatening storm surge, and extreme rainfall impacts to central American countries.
Eta left a trail of destruction through Honduras and Guatemala, eventually weakening to a tropical storm after making landfall in Nicaragua.
Families waded through the flooded streets of the northern Honduran city of San Pedro Sula, while cars sat almost submerged in parts of the central Guatemalan city of San Pedro Carcha, television footage and images posted on social media showed.
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.
The clutch of nuclear-armed states, including the United States, Britain, France, China, and Russia, have not signed the treaty.
Guatemala's police say 2,065 migrants were "returned" to Honduras between Thursday and Saturday, appearing to disperse much of migrant caravan headed for US.
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