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Mapped: Charting path of deadly ‘bomb cyclone’ in Pacific Northwest and California

Storm system is expected to weaken as it continues to chart a path over the Cascades and through to northern California and southwest Oregon by Friday

James Liddell
Thursday 21 November 2024 12:44 EST
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Related: The difference between a bomb cyclone and an atmospheric river

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A historic “bomb cyclone” has caused multiple deaths and mass power outages after slamming into Seattle, Washington, as it charts a destructive path through California and Oregon.

The extreme weather event brought damaging winds, rainfall and flash flooding that killed at least two people, downed trees and power lines, and left hundreds of thousands without power, after it hit the Evergreen State on Tuesday night.

In Lynnwood, a woman in her fifties was killed when a large tree fell on a homeless encampment, South County Fire said on Tuesday. Another woman was killed by a fallen tree while showering in her King County home, the Bellevue Fire Department said Wednesday.

As of Thursday around noon, more than 300,000 homeowners and businesses in Washington were without power, with King and Snohomish counties the worst impacted areas, according to PowerOutages.us.

An additional 11,000 energy customers have been left in blackout conditions in northern California.

Weather Prediction Center’s forecast of the storm’s path as it heads towards northern California
Weather Prediction Center’s forecast of the storm’s path as it heads towards northern California (Weather Prediction Center)

Heavy rains and strengthening winds battered the Bay Area on Tuesday night, with the winter storm reaching maximum intensity on Wednesday, the Weather Prediction Center announced.

Bruising winds with speeds surpassing 77mph wreaked havoc in the western Washington on Wednesday with high surf along the Pacific Northwest coastline throughout the day.

A waterspout spawned in Tokeland in the afternoon as it approached North Cove, after the National Weather Service issued a tornado warning for the area.

Heavy rains and a “significant” atmospheric river – a large, narrow band of moisture – continued to move slowly over northern California on Thursday morning. The regions are expected to be doused with up to 16 inches of rain by Friday evening.

Flash flooding probability through to Thursday is forecast by the Weather Prediction Center
Flash flooding probability through to Thursday is forecast by the Weather Prediction Center (Weather Prediction Center)

The WPC has also warned of life-threatening flash flooding and rock slides through the Golden State, with rainfall expected to peak on Thursday and more than a month’s worth of precipitation forecast to fall heading into the weekend.

The Cascades and the northmost parts of California will continue to see heavy snowfall, which, combined with 60mph-plus winds, could result in blizzard conditions, forecasters warn.

Heavy rain and snow is due to persist for parts of Northern California and northern Rockies through Friday.

Friday is also expected to bring the heaviest rainfall for areas south of San Francisco.

Weather Prediction Center’s probabilistic precipitation portal estimates snowfall in the region
Weather Prediction Center’s probabilistic precipitation portal estimates snowfall in the region (Weather Prediction Center)

The storm system is then predicted to weaken as it continues to chart a path through to northern California and southwest Oregon by Friday.

The “anomalously strong” storm system was considered a “bomb cyclone,” which occurs when a cyclone intensifies rapidly.

Another, albeit weaker, bomb cyclone may develop and rapidly strengthen just off the West Coast later this week.

Issaquah mayor Mary Lou Pauly described the weather event on Wednesday as “one of the worst windstorms we’ve had in recent memory,” CNN reports.

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