After a rainy weekend, the Pacific Northwest would experience another set of rainy days as an atmospheric river would drench the region with heavy rainfall, wind, and some mountain snow.
NBC reported that the Pacific storm fueled by the atmospheric river would make its way into the Pacific Northwest by late Monday night to early Tuesday morning (December 4-5).
Over 9 million people in the region were under flood alerts on Monday, and the new weather system would bring more heavy rain, gusty winds, and a significant flood risk.
Rainfall rates of around 2 to 3 inches (50mm to 76mm) per house combined with excessive runoff from melting snow would pose a risk for mudslides and avalanches across more mountainous regions.
More Rain Ahead
Over the weekend, snowfall across the Cascade mountains ranged from 6 to 15 inches (152mm to 381mm), with the next round of rainfall increasing the roundoff into area rivers, especially the Skagit and Snoqualmie, with each forecast to rise into the major flood stage late Tuesday night into Wednesday morning (December 5-6).
On the other hand, urbanized areas like Seattle and Portland should monitor travel conditions due to a high risk of urban flash flooding due to already-saturated conditions.
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