A short series of potent storms loaded with moisture stemming all the way from the central Pacific is forecast to pound Washington, Oregon, British Columbia, and parts of Northern California and Idaho with enough rain at low elevations to raise the risk of flooding. Meanwhile, snow will pile up over the high country into Wednesday.A long plume of moisture, or an atmospheric river, was visible early this week in satellite imagery over the Pacific Ocean and originated from just north of Hawaii. When a pattern such as this sets up, heavy rain and heavy mountain snow often result along the West Coast.
This plume of moisture first reached the Pacific Northwest on Monday, and began “The storms will be associated a great deal of moisture and warmer air that will cause snow levels to rise and lead to melting snow at intermediate elevations in the Olympics, Cascades and Coast Range,” according to AccuWeather Senior Meteorologist Courtney Travis.”The storm parade is predicted to unload a general 1-2 inches of rain away from the immediate coast at lower elevations, with 2-4 inches anticipated at intermediate elevations between 2,000 and 4,000 feet, but 4-6 inches of rain along the immediate coasts of Washington and Oregon into early Wednesday morning,” Travis said.
Even though the anticipated rain and high-elevation snow may not be as intense as some atmospheric river setups in the past, it has the potential to lead to significant problems.
To some extent, snow cover over the intermediate elevations will absorb the rainfall, but in some cases, the combination of rain and melting snow at intermediate elevations can release enough water into small streams and the short-run rivers flowing out of the Cascades and Olympics to lead to flooding. Water locked up in the snow can have the effect of unleashing an additional 1-3 inches of rain. Hence, the concern for flooding.”The combination of rain and saturated soil may also lead to mudslides. In areas that were hit by wildfires in the past few years, and especially this past season, the risk will be greater,” Travis said.
Meteorologists warned about another danger that could arise from the stormy weather this week. Wet snow falling from the storms this week and milder conditions could cause snowpack over the high country to become unstable enough to lead to avalanches.
Gusty winds will also accompany the stormy pattern.”The strongest winds are forecast to be along the coasts of Oregon and Washington into Tuesday night,” Meteorologist said.”Gusts from the southwest can approach 70 mph,” Maday said.
Snow levels are forecast to rise steadily into Tuesday evening and climb above 6,000 feet on the northern Cascades. Freezing air may allow icy conditions to linger for a time on the upper, eastern slopes. As freezing levels begin to fall early Wednesday, the bulk of the storm will have pushed well inland but snow showers can occur down to pass levels of the Cascades as the day progresses.
From mid- to late-week, the weather pattern will change along the Pacific coast.
reference_
accuweather
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