Hurricane Eta quickly gained force on Monday as it rumbled closer to Nicaragua and Honduras, which it is expected to batter with devastating winds and rains overnight, the U.S. National Hurricane Center (NHC) said.

The storm, a Category 1 hurricane on the five-step Saffir-Simpson scale, is expected to strike the northeast coast of Nicaragua and neighboring areas of eastern Honduras by early Tuesday, the Miami-based NHC said.

Through Friday evening, Eta's rains will cause "catastrophic" flooding and landslides in Central America, the NHC said. Jamaica, southern Haiti, the Cayman Islands, El Salvador and southern Mexico may also be hit.

Eta is poised to be one of the most powerful hurricanes to hit Nicaragua in years, and may test President Daniel Ortega, who presides over one of the poorest countries in the Americas.

The government is on high alert. It has evacuated some coastal communities and sent in supplies to help residents prepare for the storm's impact, state-run media said.

According to the latest NHC forecast, Eta could reach land as a Category 2 hurricane, packing winds of up to 110 miles per hour (177 kilometers per hour). Once the storm clatters into the mountains of Nicaragua and Honduras, it should weaken rapidly.

Early on Monday, Eta was 165 miles (266 km) east-northeast of Puerto Cabezas, Nicaragua, churning west at 10 mph (16 kph) and blowing sustained winds of 90 mph (145 kph), the NHC said.

Eta is the 28th named tropical storm of the 2020 Atlantic hurricane season, tying an all-time record set in 2005, the NHC's Tropical Analysis and Forecast Branch said.

Eta could dump 15-25 inches (381-640 mm) of rain on central and northern Nicaragua and much of Honduras, with up to 35 inches (889 mm) in some areas, the NHC said.

(Editing by Bernadette Baum) ((dave.graham@thomsonreuters.com; +52 55 5282 7146; Reuters Messaging: dave.graham.thomsonreuters.com@reuters.net))