Alert! California & West Coast the Train of Storms forecast is intensifying!

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Weekend California Storm May Become Wintry Mess Next Week in the Northern Plains, Upper Midwest and New England

Soaking rain and mountain snow will sock California late this week.
This system will then spread into the Midwest and New England early next week.
Snow and ice are possible where cold air lingers.
Some areas shivering in a cold snap this week could see rain from this system early next week.
A Pacific storm swinging into California this weekend will spread a mess of snow and ice from parts of the Midwest into New England, kicking off the first full week of February early next week.

After one of the coldest Midwest outbreaks in a generation, the jet stream pattern will undergo a fundamental change.

Instead of taking a nosedive out of Canada into the Great Lakes and Northeast, the jet stream will take a southward plunge in the western U.S. by the weekend.

This will push a potent storm to the West Coast this weekend that will work its way into the Plains, Midwest and Northeast early next week.

Even though the ferocity of this week's cold outbreak will retreat, there will be some lingering sufficiently cold air to manufacture snow, sleet and freezing rain in parts of these areas.

West Forecast
Before this jet-stream pattern changes, there is a separate system gliding southeastward through southern California on Thursday, bringing mostly modest amounts of rain and mountain snow to southern California and Arizona.

The stronger system arrives Friday and continues into Saturday, with heavier rain and mountain snow.


Rain
This second system has the potential to dump over an inch of rain in most of California, except for the Mojave Desert and San Joaquin Valley, and over 2 inches of rain below snow-level in the Sierra Nevada foothills, coastal ranges and parts of the Los Angeles Basin.

This rain may lead to urban flooding and debris flows over areas recently charred by wildfires, known as burn scars.

Flash flood watches have been issued for the San Francisco Bay Area where localized totals up to 4 inches of rain are possible. Flash flood watches are also in effect below snow level in the southern Sierra where 2 to 4 inches of rain may fall.

Strong and potentially damaging winds could also accompany the storm in Northern California.

Snow
Heavy snow is also expected in the Sierra beginning Friday night. Before the first storm moves away, several feet of snow are expected in the higher terrain. Travel issues are possible, especially in the normally tricky spots like Donner Pass. Snow levels will gradually fall through the weekend, from around 6,000-7,000 feet Friday to 3,000 feet Monday.

The National Weather Service has issued winter storm warnings for much of the Sierra Nevada from late Friday through the weekend.

Further north, snow levels will be rather high, including around 5,000 feet in the Cascades with rain expected in Portland and Seattle.

Less than two inches of rain are expected below snow level across western portions of Washington and Oregon with lighter rainfall elsewhere in the Northwest.

Midwest and Plains Forecast
The western system will head into the Plains Sunday, then into the upper Midwest and Great Lakes Sunday night into Monday.

While the air mass won't be nearly as cold as this week's cold outbreak, high pressure nosing eastward across the Canadian prairie should keep enough cold air in place to generate snow, sleet or freezing rain from the northern Plains to at least the northern Great Lakes and parts of the interior Northeast.

Saturday-Saturday night: Rain and high elevation snow will fall across most of the West. Light snow, sleet or freezing rain may break out in parts of the Great Lakes from an initial jet-stream disturbance.

Sunday-Sunday night: Snow, sleet, freezing rain and increasing winds will impact the Dakotas, northern Nebraska, northwest Iowa and parts of Minnesota. Some snow or ice may also move into far northern Michigan, northern New York and New England.

Monday: Snow or rain changing to snow and strong winds could impact parts of the upper Midwest as the area of low pressure lifts into Canada. Amazingly, some areas shivering in subzero cold late this week may see rain, not snow, from this system, particularly in the Ohio Valley and parts of the Great Lakes.