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The unseasonably warm weather hitting as the week ends won't last long.

With temperatures expected to drop dramatically between Friday, Jan. 12, and Saturday, Jan. 13, forecasters are warning of an "extreme transition."

"It’ll be almost a 50 degree drop in 36 hours, and you’ve got to adjust for that,” said Paul Head, a meteorologist for the National Weather Service.

Paul Walker, a senior meteorologist for AccuWeather, agreed that temperatures will drop "pretty sharply" after Friday evening.

“The cold weather is coming back to stay for a while,” he said.

The National Weather Service has issued a winter weather advisory for York County starting at midnight and ending 10 a.m. Saturday. Mixed precipitation is expected, with snow accumulations of less than an inch, according to the weather service.

Friday into Saturday: Head said Friday should see a high in the low 60s, caused by a low pressure area coming up across the Ohio Valley. The temperatures will approach a record high set for Jan. 12 just last year, at 65 degrees.

The flip side, he said, is that all the warm air is going to get pushed out by arctic air, with temperatures expected to be in the 20s on Saturday.

“Tomorrow afternoon, you’ll know it’s winter again," Head said Friday.

With that, the rain Friday could become freezing rain, sleet and maybe even some snow.

“The transition that we’re about to undergo is an extreme transition," Head said.

Walker shared similar thoughts, but he also said there's a potential for even some thunderstorms during the transition.

Head said the hazardous conditions will occur around daybreak Saturday, "enough to make roads really slippery." 

Walker said there is a concern that any wet or untreated roads from Friday will freeze.

Next week: Both meteorologists said there is a potential for snow starting early next week. 

“There’s a little system that could bring us some snow Monday night into Tuesday,” Walker said.

Head said the area could see 1 or 2 inches of snow, but it was too early to say when the snow would hit.

For the weekend, York County is expecting to see a high of 31 and low of 11 Saturday, followed by a high of 24 and low of 8 Sunday, Jan. 14, according to the National Weather Service.

— Reach Christopher Dornblaser at cdornblaser@yorkdispatch.com or on Twitter at @YDDornblaser.

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