Hurricane Mawar crawled towards Guam on Wednesday afternoon, bringing hurricane-force winds that snapped timber and leaving many of the American territory with out energy, the authorities mentioned.

The storm, with the pressure of a Class 4 hurricane, was the strongest to method the Pacific island in years and will intensify by Wednesday night, forecasters warned. The Guam Energy Authority mentioned that the island’s power grid was offering energy to solely about 1,000 of its roughly 52,000 clients, and that it was too harmful for restore crews to enterprise outdoors.

Mawar had not formally made landfall in Guam as of midafternoon, and it was potential that the island is likely to be spared a direct hit, mentioned Brandon Bukunt, a Nationwide Climate Service meteorologist in Guam. However the storm’s western eyewall had moved over the island, he added, and residents have been already feeling typhoon-force winds.

In an indication of the storm’s energy, it broke the radar unit that sends storm imagery to Mr. Bukunt’s workplace, and the biggest tree outdoors the workplace got here crashing down in its driveway.

The 150,000 or so individuals who reside on Guam, an island almost the scale of Chicago that sits about 1,500 miles east of the Philippines, are used to tropical cyclones. The final massive one, Tremendous Hurricane Pongsona, got here ashore in 2002 with the pressure of a Class 4 hurricane and precipitated greater than $700 million in injury.

In recent times, injury and deaths from main storms have been minimized in Guam due to stronger constructing codes and superior warnings. Normally, “We simply barbecue, chill, adapt” when a tropical cyclone blows via, mentioned Wayne Chargualaf, 45, who works on the native authorities’s housing authority.

However as a result of it has been so lengthy since Pongsona, “Now we have a complete era that has by no means skilled this,” he added. “So somewhat little bit of doubt began to creep into my thoughts. Are we actually prepared for this?”

The middle of the storm was about 40 miles east-southeast of Guam at about 1:30 p.m. on Wednesday, the Climate Service mentioned in an replace. The storm was transferring northwest at about three miles per hour, and its impression was anticipated to peak within the early night.

Mawar had weakened from Class 5 energy, however its most sustained winds have been nonetheless pushing about 140 m.p.h., equal to these of a Class 4 hurricane, Mr. Bukunt mentioned. Its southern eyewall was nonetheless offshore, however had the potential to convey even stronger winds to the island, together with torrential rains.

“Earlier than we misplaced radar, that was the place all of the actually nasty climate was,” he mentioned.

President Biden declared an emergency for Guam on Tuesday evening, permitting federal companies to help with aid efforts. By Wednesday, the island was firmly on an emergency footing, with evacuation orders, a flash flood warning and a halt to industrial aviation.

And at Andersen Air Power Base on Guam, all plane had both left the island forward of the storm or been positioned in hangars, the Air Power mentioned in an e-mail.

Tropical cyclones are referred to as typhoons or hurricanes relying on the place they originate. Typhoons, which are inclined to type from Could to October, are tropical cyclones that develop within the northwestern Pacific and have an effect on Asia. Research say that local weather change has elevated the depth of tropical cyclones, and the potential for destruction, as a result of a hotter ocean offers extra of the power that fuels them.

Mawar, a Malaysian title which means “rose,” is the second named storm within the Western Pacific this season. The primary, Tropical Storm Sanvu, weakened in lower than two days.

Carlo Sgembelluri Pangelinan, 42, who sells container properties in a retailer in Barrigada Heights, a hilly, prosperous neighborhood close to Guam’s worldwide airport, mentioned he doubted the storm could be worse than something he had lived via.

Nonetheless, Mr. Pangelinan added, he frightened about individuals who didn’t have sufficient shelter, and animals with out house owners to take care of them, together with stray canines.

The island’s inhabitants is predominantly Catholic, and the Roman Catholic church in Guam mentioned in a message to its congregants on Wednesday that the worry and anxiousness permeating the island was comprehensible, partially as a result of Tremendous Hurricane Pongsona had left an “indelible impression” that might nonetheless be felt greater than 20 years later.

“There may be good that may be discovered amid storms,” the message mentioned. “The kindness and care of those who emerge throughout such trials is considered one of them.”

John Yoon, Victoria Kim, McKenna Oxenden and Jin Yu Younger contributed reporting.