9 p.m. update:A winter weather advisory, beginning at 9 p.m. Monday, remains in effect for the York area until noon Tuesday.
The National Weather Service in State College says snow is on track to start west of the area by 10 p.m. and spread across central Pennsylvania by 2 a.m. Tuesday.
The onset of snow is expected to be quick, with moderate to heavy snowfall rates from the beginning, causing rapidly deteriorating road conditions overnight.
The heaviest snow in the York area should fall before about 6 a.m. and move off to the east by mid-morning, though some places may see patches of freezing drizzle as the snow tapers off.
The weather service projects accumulations of 2 to 4 inches of snow, with possibly a glaze of ice.
Winds are expected to be out of the south from 5 to 10 mph, gusting to 20 mph. Temperatures should remain steady in the mid-20s.
4 p.m. update: Forecasters still are predicting no more than 4 inches of snow from a storm expected to hit York County later tonight.
AccuWeather's forecast calls for 1 to 3 inches of snow for the York area; the National Weather Service indicates 2 to 4 inches of snow.
The weather service has issued a winter weather advisory beginning at 9 p.m. for York County and the surrounding area.
1:30 p.m. update: The National Weather Service has issued a winter weather advisory for York County and the surrounding area from 9 p.m. Monday through noon Tuesday.
About 2 to 4 inches of snow are expected from the latest storm, along with a thin glaze of ice, the result of sleet or freezing rain.
The snow will reach York around 2 a.m. with the heaviest precipitation in the middle of the night. The snow will taper off by sunrise, the weather service said, but patches of freezing drizzle are possible through late morning.
Earlier story: A couple more inches of snowfall stand between York and 40-degree temperatures, forecasters say.
The county is expected to see an additional 2 or 3 inches of snow starting around midnight and continuing until 9 or 10 a.m. Tuesday, said Mike Dangelo, a meteorologist with the National Weather Service in State College.
The snow will likely be heaviest between 3 and 6 a.m., he said, just before workers start their morning commute.
A tiny bit of freezing drizzle could also arrive late in the snowfall, so drivers can expect delays and slippery conditions, Dangelo said.
But Randy Adkins, a meteorologist with AccuWeather, said the snowstorm should be over by 7 or 8 a.m. Tuesday.
"I don't anticipate heavy snowfall for the morning commute," Adkins said.
The next chance of precipitation will be Thursday night into Friday, Dangelo said.
Flooding concerns?: Despite the close to 2 feet of snow that hit parts of the county last week and warmer temperatures likely later this week, the threat of flooding will be alleviated by nightly sub-freezing temperatures, Adkins said.
The high Tuesday is expected to be near 41, and the low will be around 28, the weather service says. Temperatures are expected to be in the mid to upper 40s from Tuesday through Thursday but will dip below freezing each night.
"That will slow the return of water back into the environment," Adkins said.
Rain predicted for Thursday night into Friday and temperatures of above 50 on Friday, could make the threat of flooding a possibility, he said.
However, the sheer amount of snow and cold nightly temperatures should mean the melting process will be drawn out.
"Obviously it'll be a while for it all to melt," Adkins said.
No record: The new snow Monday and Tuesday will add to the 45.8 inches recorded at the York Airport in Jackson Township so far this season.
That makes it the third snowiest winter since the winter of 2000-01, Adkins said.
The winter of 2010-11 holds the record since then with 78.8 inches, and the winter of 2002-03 is about a foot behind with 67.4 inches, he said.
With no snow in the forecast after Monday, this winter may have to settle for third snowiest. However, in that snowy winter of 2002-03, more than 27 inches of snow fell after Feb. 16, Adkins pointed out.
"Hopefully we don't see another 27 inches of snow this year," he said.
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