November 2024 Northeast Pacific bomb cyclone

North American bomb cyclone in 2024

November 2024 Northeast Pacific bomb cyclone
Meteorological history
Picture of a bomb cyclone off the Pacific Northwest coast on the afternoon of November 19, 2024
Formed	c. November 18, 2024
Renamed	National Weather Service Las Vegas unofficially dubbed the storm "Cyclone Larry" c. November 21 (November 21)
Extratropical cyclone
Highest gusts	101 miles per hour (163 km/h)
Lowest pressure	942 hPa (mbar); 27.82 inHg
Maximum rainfall	56.92 cm (22.41 in)
Overall effects
Fatalities	≥4
Areas affected	British Columbia, Washington, Oregon, California
Power outages	≥953,000
Part of the 2024–25 North American winter

A powerful extratropical cyclone developed c. November 18, 2024, in the Northeast Pacific and struck the Western United States and Western Canada. The storm underwent bombogenesis, rapidly dropping its central pressure to a record-tying level of 942 millibars (27.8 inHg). This storm was the first of two storm systems to impact the U.S. West Coast during a 3 day period. The storm was associated with an atmospheric river that dropped large amounts of rain in Oregon and California. The Storm Prediction Center (SPC) issued a rare high risk of excessive rainfall in parts of Northern California, warning of "life-threatening flooding".

Impact

British Columbia

In British Columbia, Canada, over 200,000 customers of BC Hydro were left without power. Highways 4, 14, 18, and 28—all on Vancouver Island—were closed due to debris and downed power lines. On Sartine Island, a gust of 159 kilometres per hour (99 mph) was reported.

Washington

Around 650,000 people were left without power across western Washington. In Lynnwood, Washington, a woman in her 50s was killed by a large tree that fell onto a homeless encampment. In the Bridle Trails neighborhood of Bellevue, a woman was killed when a tree hit a home. A gust of 77 miles per hour (124 km/h) was reported at Sunrise in Mount Rainier National Park, while 74 miles per hour (119 km/h) gusts were recorded in Enumclaw. A tornado warning was issued near Tokeland due to a waterspout being spotted offshore.

The Eastside region of King County was the most heavily affected area of the Puget Sound region. The area's electricity provider, Puget Sound Energy (PSE), reported that more than 400 miles (640 km) of its transmission lines were impacted by high winds and it had contacted line crews from outside of the state to assist. PSE repaired 47 of its 49 substations by November 23, but 66,000 customers still lacked service. The Snohomish County Public Utility District had over 135,000 customers in Snohomish County and Camano Island without power; by November 25, it had restored service to 99 percent of customers. Four northbound lanes of Interstate 405 were closed by a tree that fell into the highway near the Interstate 90 interchange in Bellevue. The National Weather Service weather radio transmitter on Cougar Mountain near Issaquah went off the air during the storm.

An Amtrak Cascades train struck a fallen tree in Silvana, between Stanwood and Marysville, at around 7:50 p.m. The tree pierced the locomotive's windshield but did not seriously injure the engineer or anyone onboard; service was temporarily disrupted while the damaged locomotive was towed away. Amtrak cancelled several Empire Builder and Coast Starlight trips through the region in anticipation of the storm. Link light rail service in the Seattle area was also disrupted by power outages; the northernmost section of the 1 Line was closed for several hours on November 19 and replaced by bus shuttles between Northgate and Lynnwood City Center stations. The entire 2 Line between Bellevue and Redmond was suspended on November 20 and replaced by buses. Washington State Ferries cancelled several sailings on its Port Townsend–Coupeville ferry route due to high winds across the Admiralty Inlet.

Oregon

Wind gusts up to 73 miles per hour was recorded in Oregon. At the Yaquina Bay Bridge in Newport. Corbett, Eugene, and Florence recorded peak gusts of 50, 52, and 67 miles per hour (80, 84, and 108 km/h), respectively. Winds of 45 miles per hour (72 km/h) were recorded at Portland International Airport. Approximately 10,000 people in the Portland metropolitan area lost power.

California

The cyclone was associated with an atmospheric river reaching California from the tropics.

Near the Oregon-California border, Interstate 5 was closed due to heavy snow. In addition, the Avenue of the Giants was closed amid flooding. On Mattole Road in Humboldt County, a 98 mph gust was recorded, and at Crescent City Harbor in Del Norte County, an 80 mph gust was recorded. Over 430 flights were delayed and 60 cancelled at San Francisco International Airport. 23,000 power outages were reported in California. Two people were reported dead in Sonoma County, with the first being found dead in a creek and the second in a flooded vehicle.