York County fore­cast calls for rain, chilly temps

The Herald (Rock Hill) - - Local & State - BY STEVE LYTTLE Cor­re­spon­dent Steve Lyttle on Twit­ter: @slyt­tle

A big dip in the jet stream will bring mid­win­ter tem­per­a­tures and an end to the grow­ing sea­son in the Rock Hill area this week­end, fore­cast­ers say.

Be­low-freez­ing tem­per­a­tures are ex­pected early Sun­day, with an­other surge of even colder air pre­dicted to ar­rive by the mid­dle of next week.

Pre­ced­ing each of the cold blasts will be a rain­pro­duc­ing sys­tem, ex­pected to bring more than an inch of pre­cip­i­ta­tion to the Rock Hill area, ac­cord­ing to fore­cast­ers.

It was only a month ago that tem­per­a­tures were climb­ing into the 80s and the hu­mid­ity was still at sum­mer­time lev­els, but all that is gone.

In its place is a win­ter- like pat­tern, caused by a large buck­ling of the jet stream over the east­ern half of the coun­try.

A low-pres­sure sys­tem, re­spon­si­ble for Fri­day’s rain across the re­gion, is ex­pected to push east­ward, al­low­ing cold high pres­sure to set­tle in from Canada. High tem­per­a­tures are only ex­pected to reach the low 50s Satur­day, which is mid-Jan­uary lev­els.

That will be fol­lowed by the cold­est night so far this sea­son, fore­cast­ers say.

Orig­i­nally, com­puter guid­ance in­di­cated overnight lows would be near freez­ing, but the Na­tional Weather Ser­vice’s Jake Wim­ber­ley says it now ap­pears tem­per­a­tures will be even colder.

“A freeze is look­ing in­creas­ingly likely for most of our zones, where the grow­ing sea­son is still con­sid­ered ac­tive,” Wim­ber­ley said.

That means read­ings in the up­per 20s are likely Sun­day morn­ing, with af­ter­noon highs barely reach­ing 50.

On the heels of that cold air will be a storm sys­tem, ex­pected to de­velop late this week­end in the Gulf of Mex­ico and move north­ward Mon­day and Tues­day.

The sys­tem will spread rain into the Rock Hill area by mid­day Mon­day, last­ing about 24 hours.

Rain­fall from that sys­tem could to­tal be­tween 1 and 2 inches, ac­cord­ing to com­puter guid­ance.

Once the storm sys­tem moves up the coast, an­other surge of cold air will fol­low.

High tem­per­a­tures Wed­nes­day and Thurs­day are not ex­pected to climb out of the 40s, de­spite sunny skies, fore­cast­ers say.

The longer-range com­puter guid­ance in­di­cates a trend to­ward milder weather ar­riv­ing some­time dur­ing Thanks­giv­ing week.

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