‘Bomb cyclone’ knocks out power to over 600,000 across northwest US, killing 1

ISSAQUAH, Wash. — A major storm swept across the northwest U.S., battering the region with strong winds and rain, causing widespread power outages and downing trees that killed at least two people.

The Weather Prediction Center issued excessive rainfall risks through Friday and hurricane-force wind warnings were in effect as the strongest atmospheric river — a large plume of moisture — that California and the Pacific Northwest has seen this season overwhelmed the region. The storm system that hit starting Tuesday is considered a “ bomb cyclone,” which occurs when a cyclone intensifies rapidly.

In California, the weather service extended the flood watch into Saturday for areas north of San Francisco due to “increased confidence in flooding impacts.” Higher elevations of the Sonoma County wine region recorded up to 1 1/2 inches (3.8 cm) of rain over 24 hours, forecasters said Wednesday morning. More than 10 inches (25 cm) was predicted for northern parts of the state and down into the central coast. Dangerous flash flooding, rock slides and debris flows were possible, officials warned.

A winter storm watch was in place for the northern Sierra Nevada above 3,500 feet (1,066 meters), where 15 inches (28 cm) of snow was possible over two days. Wind gusts could top 75 mph (120 kph) in mountain areas, forecasters said.

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Heavy, wet snow was expected to continue along the Cascades and in parts of far northern California. Forecasters warned of blizzard and whiteout conditions and near impossible travel at pass level due to accumulation rates of 2 to 3 inches (5 to 7.6 centimeters) per hour and wind gusts of up to 65 mph (105 kph).

Falling trees struck homes and littered roads across northwest Washington. In Lynnwood, Washington, a woman died Tuesday night when a large tree fell on a homeless encampment, South County Fire said in a statement. In Bellevue, east of Seattle, a tree fell onto a home, killing a woman Tuesday night, fire officials said.

Tracy Meloy of Issaquah, Washington, felt well-prepared for the storm Tuesday afternoon, with dinner prepped and lanterns ready. But then she spent the night listening to wind-whipped debris hit the outside of her home, including a particularly loud “thump” around 9 p.m. On Wednesday morning she ventured outside to survey the damage to her neighborhood about 17 miles (27 kilometers) east of Seattle.

“Now that I’m standing here in front of the house, I can tell it’s the tree that was across the street,” Meloy said. The tree pulled down the power lines in front of her home. Limbs, leaves and other plants were strewn all over the road.

“It looks like a forest floor instead of a street,” she said.

The number of power outage reports in Washington state fluctuated wildly Tuesday evening, but steadily declined to about 530,000 by Wednesday morning, according to poweroutage.us. More than 3,000 were reported to be without power in Oregon and more than 21,000 had no power in California as of Wednesday morning.

“Trees are coming down all over the city & falling onto homes,” the Bellevue fire department posted on X on Tuesday night. “If you can, go to the lowest floor and stay away from windows. Do not go outside if you can avoid it.”

The first significant snow of the season in the Dakotas and Minnesota led to accidents and slippery roadways. The weather service said up to 16 inches (40 cm) of snow could fall in the Turtle Mountains of North Dakota, and Minot could get up to 8 inches (20 cm) of snow. Winds were expected to be problematic in parts of Montana and Nebraska, with gusts up to 60 mph (97 kph), the weather service said.

State troopers in northern Minnesota responded to several accidents, including tractor-trailers that jackknifed on Interstate 194 after the roadway became slippery from snow and ice, the Minnesota State Patrol said. There were no immediate reports of injuries.

The weather service warned people on the West Coast about the danger of trees during high winds, posting on X, “Stay safe by avoiding exterior rooms and windows and by using caution when driving.”

Southbound Interstate 5 was closed for an 11-mile (18-kilometer) stretch from Ashland, Oregon, to the border with California on Wednesday morning due to extreme winter weather conditions in northern California, according to the Oregon Department of Transportation. It was expected to be a long-term closure, the department said.

The weather service issued a flood watch for parts of southwestern Oregon through Friday evening, while rough winds and seas halted a ferry route in northwestern Washington between Port Townsend and Coupeville.

A blizzard warning was issued for the majority of the Cascades in Washington, including Mount Rainier National Park, starting Tuesday afternoon, with up to a foot of snow and wind gusts up to 60 mph (97 kph), according to the National Weather Service in Seattle. Travel across passes could be difficult if not impossible.