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Snow, record cold to plunge southward through western US

By Kristina Pydynowski, AccuWeather senior meteorologist

Published Feb 18, 2018 10:38 PM EDT | Updated Jul 1, 2019 5:14 PM EDT

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The same storm that caused officials to close a section of Interstate 90 in Washington on Saturday will continue to spread snow and unusually cold air across the western United States early this week.

“After a very warm start to February, this storm will signal a pattern change by dragging much colder air into the region,” AccuWeather Meteorologist Max Vido said.

“Plowable snow will accompany the colder air, bringing slippery travel and snow-covered roads to a good portion of the interior West.”

Motorists should prepare for slow and treacherous conditions on stretches of interstates 15, 25, 70 and 80 across the Rockies.

Snowfall North Central 2.19 AM

The snow will be a delight for the ski resorts, Vido added.

Travel may become especially difficult in the corridor from Salt Lake City to Casper, Wyoming.

“The 4-8 inches expected in Salt Lake City would be the most snow to fall in the city since mid-January,” Vido said. Amounts may approach a foot around Casper.

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Enough snow to cause roads to turn slippery for a time is also expected in Flagstaff, Arizona, on Monday and Denver on Monday night.

The snow will fizzle before spreading much farther to the south of Denver along I-25, meaning another missed opportunity for much-needed wet weather in the drought-stricken areas of the southern High Plains.

Similarly, Southern California will not receive substantial rainfall from this storm.

As the storm plunges southward, winds strong enough to cause power outages, tree damage and hazards for high-profile vehicles will sweep into the Desert Southwest on Monday.

Blowing dust can also get whipped up across the deserts, dramatically reducing visibility for motorists.

SW Strong Winds 2.19 AM

While not all of the West will have to deal with snow or strong winds from this storm, the cold plunging southward will be more far-reaching.

Highs will be held 10 to 20 degrees Fahrenheit below normal in most communities through Tuesday.

Highs in the 70s and even lower 80s that have dominated Los Angeles frequently this month will be replaced with temperatures being held to the upper 50s. A high near 70 F is more common this time of year.

Record lows will be challenged all along the I-5 corridor from Seattle to Portland and Medford, Oregon, to Sacramento and Bakersfield, California. San Francisco will join this list.

west cold Feb 18

Freezing temperatures to pose some risk to California crops

There can be as many as three nights, starting Monday night, where temperatures are likely to dip to or below freezing in California's Central Valley.

"We expected to get cold enough where there is concern for some damage to crops, especially non-citrus crops over the Central Valley," AccuWeather Senior Agricultural Meteorologist Dale Mohler said. "All growers should consider taking precautions."

Widespread damage to citrus crops, especially the thick-rind oranges in the region is not likely. Lows are forecast to be in the middle to upper 20s.

"Temperatures would have to drop to 24 F for four to five hours for widespread damage to most of the oranges grown in California," Mohler said. "We do not expect it to get quite that cold."

There is concern for vineyards, where bud break has taken place, as well as strawberries, tender vegetables and perhaps lemons.

Farther south, over the Imperial Valley, temperatures may approach 32 F on a couple of nights into midweek.

Pipes that are above ground or in unheated or poorly insulated areas of homes and businesses are at greatest risk to freeze and burst.

While temperatures should stop short of reaching the 30s in downtown Los Angeles and San Diego early this week, a frost or freeze may have residents in the surrounding valleys shivering.

Such conditions may even reach the coast of Central California.

Residents will want to turn up the heat and cover or bring in any outdoor plants.

“This shot of cold will have some staying power with below-normal temperatures expected to persist into at least next weekend,” Vido said.

Residents will notice an increase in heating costs to combat the cold as temperatures will continue to drop down to near or below freezing in the Central Valley and the valleys in Southern California.

Some communities, including Seattle and Sacramento, may continue to challenge nighttime record lows daily through the week.

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