The storm gathered strength as it neared land.
Eta, a powerful Category 4 hurricane, continued to gain strength as it neared the Caribbean coast of Nicaragua, where it was expected to make landfall early Tuesday, the National Hurricane Center in Miami said.
As of 10 p.m. Eastern on Monday, the storm was about 45 miles east of Puerto Cabezas, a Nicaraguan port town, and had maximum sustained winds of 150 miles per hour. The storm was moving west-southwest at about 7 miles per hour.
“Life-threatening storm surge, catastrophic winds, flash flooding and landslides expected across portions of Central America,” an advisory from the Hurricane Center said.
A hurricane warning was in effect for a stretch of the Nicaraguan coast from the border with Honduras in the north to Sandy Bay Sirpi.
The storm was expected to move over northern Nicaragua through Wednesday night and then across central portions of Honduras on Thursday, losing strength as it leaves the Caribbean behind, the Hurricane Center said.
In addition to catastrophic wind damage, forecasters said the hurricane could dump as much as 25 inches of rain on much of Nicaragua and Honduras, with volumes reaching 35 inches in some locations. Eastern Guatemala and Belize were expected to receive between 10 and 20 inches, while portions of Panama and Costa Rica could see between 10 and 15 inches.
Forecasters also warned of a storm surge of as much as 21 feet above normal tide levels along the Nicaragua coast, and swells causing “life-threatening surf and rip current conditions” along the Caribbean coast in Central America and the Yucatán Peninsula of Mexico.
A busy hurricane season in the Atlantic.
Eta is the 28th named storm — and the 12th hurricane — in the Atlantic hurricane season, tying a record for most named storms set in 2005.
Only three other Atlantic hurricane seasons on record have had at least 12 hurricanes: 1969 (12 hurricanes); 2005 (15 hurricanes); and 2010 (12 hurricanes), said Philip Klotzbach, a research scientist at Colorado State University in Fort Collins.
In 2005, as with this year, so many storms grew strong enough to be named that meteorologists had to resort to the Greek alphabet after exhausting the list of rotating names maintained by the World Meteorological Organization.
The agency never got to Eta, however, because the 28th storm of that year — a subtropical storm that formed briefly in October near the Azores — was not identified until the season was over.
With about a month left in the 2020 hurricane season, the 2005 record for the most named storms is likely to be broken, Mr. Klotzbach said.
“The odds certainly favor another storm or two forming in November,” he said. “The large-scale environment, especially in the Caribbean, is forecast to remain more conducive than normal for this late in the hurricane season.”
Eta followed Hurricane Zeta, which landed on Oct. 28 in Louisiana as a Category 2 storm, killing at least six people and causing widespread power outages in Louisiana, Mississippi, Alabama, Georgia and the Carolinas.
The hurricanes of 2020 have not matched the intensity of the storms of 2005. That year, eight storms became major hurricanes, which are defined as those that reach Category 3 or higher. But the effects of the 2020 season across the South of the United States have been widespread.
Hurricane Laura battered Lake Charles, La., in late August; Hurricane Sally lashed the Florida Panhandle with a deluge of rain in September; and Hurricane Delta made landfall in October in Louisiana less than 20 miles east of where Laura struck, slamming the area as it was still trying to recover.
Government scientists pointed to factors like higher-than-average sea surface temperatures in the tropical Atlantic Ocean and Caribbean, a strong African monsoon season and a reduced vertical wind shear, which means less wind variability at different altitudes that can disrupt the formation of storms.
Climate scientists say there are links between global warming and the intensity of hurricanes. As ocean temperatures rise, hurricanes grow stronger, with warm water serving as the fuel that powers them.
Evacuations and emergency aid in Nicaragua.
The Nicaraguan authorities rushed on Monday to evacuate inhabitants from low-lying areas along the Caribbean coast and ship in emergency supplies as Hurricane Eta neared landfall.
The Nicaraguan government sent 88 tons of food to the port town of Puerto Cabezas ahead of the storm, according Nicaragua’s national disaster response agency.
Officials also dispatched four trailers loaded with supplies including mattresses and hygiene kits, the agency said, and sent food supplies including rice, oil and protein supplements.
“In this way, the government of Nicaragua will be able to provide quick and effective humanitarian aid to families,” said Dr. Guillermo González, the director of the agency, the National System for Disaster Prevention, Mitigation and Attention.
Officials said that more than 3,000 families had been evacuated from coastal areas, according to local press reports. In Honduras, evacuations were also underway on Monday, and severe weather conditions had forced the closure of some ports, Reuters reported.
