Powerful Atmospheric River Set to Drench the Pacific Northwest With Heavy Rain, Flooding, and Wind
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A Brief Calm Before the Storm
After several days of scattered showers, the Pacific Northwest is experiencing a short-lived break in the weather. But the calm will not last. Meteorologists are warning that a powerful Atmospheric River will sweep into the region later this week, bringing days of heavy rain, flooding, strong coastal winds, and mountain snow.For now, the weather feels deceptively mild. In Seattle, WA, and Portland, OR, temperatures sit in the lower 60s, with patches of sunshine slipping through the clouds. But by midweek, the atmosphere will reload, setting the stage for a much more turbulent pattern.
Storms Lining Up Along the Coast
The first in a series of storms brushed the region on Sunday, dropping rain on the lowlands and snow at higher elevations. After a brief lull through Tuesday night, another system will begin moving into southwestern British Columbia, Canada, late Wednesday, spreading showers across Washington and northern Oregon.By Thursday, the disturbance will strengthen into a coastal storm, pushing ashore with drenching rainfall, gusty winds, and wet snow in the mountains. Wind gusts may reach 50 mph along the coast and 30-40 mph farther inland. Coastal and mountainous areas in Oregon and Washington could receive between 2 and 4 inches of rain, with isolated areas picking up as much as 6 inches.
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Atmospheric River to Bring Heavy Rain, Flooding, and Mountain Snow to the Pacific NorthwestFlooding Concerns and Difficult Travel
Forecasters warn that multiple rounds of rain could lead to flooding, landslides, and hazardous travel conditions across the Pacific Northwest. The heaviest rainfall is expected from Thursday through Saturday, with rivers and streams likely to rise quickly and low-lying areas facing localized flooding.At higher elevations, heavy, wet snow will accumulate in the Cascades and Sierra Nevada. Early in the storm, snowfall will remain above mountain passes, but as colder air filters in by the weekend, snow levels will drop, making mountain travel increasingly dangerous.
Rain’s Double-Edged Impact
The coming rain will bring both relief and risk. The Pacific Northwest has been facing severe drought conditions, and several days of steady rain will help replenish soil moisture and raise river levels. But the deluge will come at a cost.Strong winds could topple trees and cause power outages, while saturated hillsides may trigger mudslides. Mountain passes could face closures as snow and slush accumulate.
“Atmospheric Rivers are most common from November through January," Merrill noted. “They can dump several inches of rain within a single day, enough to cause flash floods and mudslides. The one coming at the end of the week looks to fit that pattern."
As the storm approaches, residents are being reminded of the Pacific’s power — how quickly calm skies can turn to gray clouds, pounding rain, and roaring wind. The week will end not with sunshine, but with the full force of an autumn storm pressing against the coast.
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