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Atmospheric River & more Waves headed to USA: Wild Weather report

3,167 views · Published 17 January 2017 · 6:39 · Indexed 26 September 2026

Channel: thornews · 2017 · Science & Technology

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We've got waves and waves of rain, moisture and wind headed to Alaska, Canada, Washington, Oregon & California. Those waves of storms will then move East across the USA. 
God bless everyone,

T

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https://weather.com/forecast/regional/news/heavy-rain-snow-atmospheric-river-west-california-mid-january

Atmospheric River to Bring a Mess of Snow, Ice, Flooding Rain to the West; More Icy Concerns for Portland, Oregon

Freezing rain advisories have been posted for parts of the Pacific Northwest, including the Portland, Oregon, and Spokane, Washington, metro areas. An ice storm warning is in effect for the south Washington Cascades (below 3,000 feet) and for portions of the east slopes of the northern Cascades, western Columbia Basin and into Washington's northern mountains.

Winter storm warnings cover the northern and western Cascades in Washington and a portion of northern Idaho.

Also, flood watches have been posted along western Washington and Oregon, including parts of the Willamette Valley.

On the heels of a period of flooding and prolific snow last week, another deep plume of moisture known as an atmospheric river will surge into parts of the West by the early morning hours on Tuesday.

This feature will then slide down the West Coast and push into the Rockies into the middle of the week, raising the threat of flooding rain, more heavy mountain snow and also possibly laying down another layer of ice.

Let's get into the particulars of this forecast, starting with timing, then with potential flooding, snow and ice impacts. 

Tuesday

Wind-driven precipitation arrives in the Northwest, from far northwest California to Oregon and Washington. 
Snow levels will rise up to at least 8,000 feet in the Cascades, resulting in snowmelt. This snowmelt combined with any heavy rainfall will increase the chance for flooding.
Freezing rain is also expected in the Columbia River Gorge, upper Hood River Valley and Willamette Valleys of Oregon and Washington. Cold air trapped in other areas of eastern Washington and the chimney of Idaho may lead to sleet or freezing rain, there.
By late afternoon, precipitation is expected to change over to rain from south to north in the Willamette Valley.

Wednesday

Moderate to heavy rain and snow will spread farther south and east into northern California.
Some rain and mountain snow should reach southern California Wednesday night.
Snow levels will remain high in the Cascades, but will begin falling late Wednesday night.
Snow levels should fall to 6,000 feet in the Sierra.
Windy conditions are also expected with the cold front's arrival, with some tree damage and power outages possible.
Snow will spread into parts of the inter-mountain West and Rockies.
Parts of the Great Basin, from eastern Washington to eastern Oregon, Idaho's "chimney" and Snake River Plain may see freezing rain and/or sleet.

Thursday

Showers will continue in California and the Northwest, but most heavy rain should be over, for the time being.
Snow levels will lower to between 2,000 and 4,000 feet in the Cascades and Sierra.
Pockets of heavy snow are expected from the northern Rockies to the Four Corners higher elevations.
Winds will be gusty once again, especially along the coast and into parts of southern California.

Friday

Another strong low-pressure system may approach the West Coast.
This could result in additional bouts of heavy rain, mountain snow and strong winds.
However, snow levels should be much lower with this storm.

Beyond Friday, our longer-range guidance suggests the storm track will deliver additional storms to California and the West into next week.

How Much Ice?

The greatest chance for accumulating ice will be in eastern Washington and parts of eastern Oregon, as well as parts of the northern Willamette Valley of Oregon, including the Portland metro area. At least a glaze of ice is also possible in parts of Idaho's Snake River Valley.

Slippery roads, not just bridges and overpasses, are likely.

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