3:15 p.m. update: The National Weather Service is forecasting snow to begin around 1 a.m. Saturday morning, with overnight snow accumulation of around an inch.
Snow is forecast to stop before 1 p.m. Saturday, with another 1 to 3 inches of accumulation possible.
Saturday night will be mostly cloudy with a low around 14, and Sunday will be partly sunny, with a high near 26.
Meteorologist Greg DeVoir said residents don't need to concern themselves with snow melt and flooding at present.
"We'll worry about that when it's appropriate," he said.
The temperatures in the forecast don't show a potential for flooding until the middle or end of next week, he said.
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After a sunny day on Friday with a high of 36, the snow will begin again after midnight and continue through Saturday morning, the service said. Friday night's low will be 24, and Saturday's high will be 31, with northwest winds of 13-18 mph gusting up to 25 mph.
Saturday night will be mostly cloudy, with a low of 12, and Sunday will be partly sunny, with a high of 26 and low around 6.
Midnight update: Up to an additional 4 inches of snow fell on York County between 6:30 p.m. and midnight Thursday.
The National Weather Service in State College says Friday should be cloudy with a high near 36 but wind gusts as high as 28 mph. Then Friday night, there are supposed to be snow showers (chance of precipitation 80 percent), with the possibility of additional snow accumulation of about an inch.
Saturday also has a chance of snow showers, mainly before noon, but for the most part, the day is supposed to be partly sunny with a high near 28.
4 p.m. update: The storm isn't over yet.
York County could see an additional 1 to 3 inches of snow later tonight with it ending between 2 to 3 a.m. Friday, said Alan Reppert, a meteorologist with AccuWeather.
That's on top of the 10 to 16 inches of snow reported in the county as of 4 p.m., he said.
The honor for largest snowfall amount goes to New Freedom where 16 inches fell between when the storm started about 8:30 p.m. Wednesday and Thursday afternoon.
Despite the additional snow expected tonight into Friday morning, Reppert said it shouldn't pose much of a problem for motorists during the morning commute if the roads are plowed.
York won't be without new snow for long on Friday with more expected that night. Reppert said an added 1 to 3 inches is expected Friday night into Saturday morning.
1 p.m. update: York County is in a "dry slot" of the storm, with snow slowly tapering off and a mix of rain and sleet expected to resume Thursday afternoon, said John LaCorte, a meteorologist with the National Weather Service.
The heaviest part of the snow is off to the north and west of York, he said, but a couple more inches of accumulation is possible before the storm leaves the East Coast around 10 p.m. Thursday.
11:15 a.m. update: The National Weather Service is forecasting continued heavy snow as a thick belt of the storm passes, with accumulation of about an inch an hour. About 16 inches is expected before the storm tapers off late Thursday night.
Across York County, residents have reported between between 10 and 12 inches of snow by 11 a.m., with amounts varying by location.
Emergency officials are advising residents to avoid travel.
Anyone seeing red from this winter's trend of cold and snow might have trouble seeing a color other than white Thursday.
As much as 10 inches of snow had fallen on York County by 8 a.m., and another 5 or 6 inches was expected to fall by the end of the storm late Thursday night.
Visibility in the York area was reported to be as low as a quarter mile, with snow falling at a rate of "easily an inch or more an hour," said John LaCorte, a meteorologist with the National Weather Service in State College.
Streets were mostly silent as schools, government offices and many businesses had closed for the day.
York County 911 was reporting only a handful of disabled vehicles, compared to a pages-long list of crashes it posted after last week's ice storm.
"Fortunately, it seems like everyone is heeding the warnings and staying off the roads," said PennDOT District 8 spokesman Mike Crochunis.
State roads and Interstate 83 were slushy and snow-covered, but plows were making continuous loops around highways and plowing most other streets in two-hour routes, he said.
"We have been on top of it so far, we just don't know how long that can last," Crochunis said, adding snow was falling quickly Thursday morning and there were concerns that the dry, light snow could start drifting as high as several feet.
"We're getting a lot of snow this time," he said. "It's not just a couple inches. This is very dry snow and it's easily blown around."
He said he was hoping the mix of precipitation expected as the storm progresses will "glaze" the lighter snow so it can't blow around as much.
He encouraged people to avoid travel if possible but said those who must drive should be OK if they "take it slow and don't drive like an imbecile."
They should also carry blankets, water, important medications and other emergency supplies in their vehicles, he said.
Storm history: Though this year's sub-zero temperatures and seemingly back-to-back snowstorms might have people feeling this winter has been among the worst, LaCorte said it is by far not the worst in modern history.
Including the snow that had already fallen Thursday morning, York had about 40 inches of snow for the season to date.
That compares to 81.3 inches for the whole winter season of 1960-1961, he said.
However, York is approaching the snowfall totals set in 2009-2010, 57.3 inches.
"After it starts reaching a certain height people stop caring about it," he said. "They just want to know when it's going to go away."
It could start "going away" as early as next week.
Temperatures are forecast to be in the 40s Tuesday and much of next week, bringing above-average highs to a county that has logged record lows in January and February.
The norm for this time of year is a high of 40 and low around freezing.
"This pattern finally looks like it's going to be on its way," LaCorte said.
There are 35 days until March 20, the first day of spring.
- Reach Christina Kauffman at firstname.lastname@example.org.