Intense Storm Threatens Pacific Northwest with Cyclone and Atmospheric River

A formidable weather system is poised to hit the Pacific Northwest and Northern California this week, promising heavy precipitation and powerful winds. The National Weather Service (NWS) has issued warnings for this rare event, which combines a «bomb cyclone» and an atmospheric river. These weather formations are expected to drive intense rain, snowfall, and wind across affected regions, potentially causing significant disruptions.

The so-called «bomb cyclone» is projected to rapidly intensify, undergoing a process known as «bombogenesis,» to reach a status where it could be classified as a «triple bomb,» according to the National Weather Service office in San Francisco. This rare meteorological event is likely to deliver one of the decade’s most intense storms, with formidable winds creating hazardous maritime conditions with waves up to 35 feet, reports the NWS in Medford, Oregon.

The atmospheric river will bring a sustained flow of moisture, resulting in substantial rainfall and mountain snows starting Tuesday and persisting throughout the week. The combination of these weather phenomena will stall along the coast, prolonging dangerous conditions. Parts of Northwest California are forecasted to receive as much as 16 inches of rain in 48 hours, greatly increasing the risk of urban flooding and landslides, especially north of the Golden Gate area, according to meteorologists.

Weather predictions indicate that the brunt of the precipitation will occur from Wednesday into Thursday, with a high risk of flooding expected in Northern California, where a level 4 flood threat has been issued. Such alerts are notable for their infrequency, occurring less than 4% of the time but often leading to severe outcomes.

Winter weather advisories are in effect for higher elevations, where blizzard conditions could develop. Areas such as the Washington Cascades are anticipated to receive over 12 inches of snow, with wind gusts reaching 60 mph, creating potentially impassable road conditions on key routes including Interstate 5.

The coastal regions will experience widespread wind gusts of 35 to 50 mph, with hurricane-force gusts possible near capes and peninsulas. This has raised concerns about possible power outages and damage to structures, with authorities advising minimal travel until conditions improve.

In Southern California, contrasting weather conditions are expected, with dry winds enhancing fire risks amid ongoing firefighting efforts. Meanwhile, the Southwestern parts of Oregon might anticipate high rainfall amounts of up to 10 inches, with flooding and wind warnings active until the weekend.

As these severe conditions unfold, residents are advised to prepare for disruptions in daily activities, potential evacuations due to flooding, and to heed advice from local authorities on safety measures during this critical weather event.