The winter precipitation is coming down in Frederick County and surrounding jurisdictions.

The National Weather Service in Sterling, Va. has put the region under a Winter Weather Advisory until 6:00 AM Thursday. The agency says there will be snow at first, followed  by snow and sleet, and then rain and freezing rain. Snow accumulation could range from one to three inches. Ice accumulations are expected to be up to about two-tenths of an inch, according to the National Weather Service.

The State Police in Frederick, Washington and Carroll Counties have put the Snow Emergency Plan into affect. Motorists who venture out should have vehicles equipped with snow tires, or chains. Studded tires can be used from November 1st through March 31st. Parking is not permitted on Snow Emergency Routes. In Frederick County, they include:

U.S. Route 15

U.S. Route 15 (Business)

U.S. Route 40

U.S. Route 40 (Alternate)

U.S. Route 340

MD Route 17

MD Route 26

MD Route 27

MD Route 28

MD Route 31

MD Route 75

MD Route 76

MD Route 79

MD Route 80

MD Route 85

MD Route 140

MD Route 144FA

MD Route 180

MD Route 194

Interstate 70

Interstate 270

Frederick County Highway Operations crews have been out since 4:00 AM pre-treating roads. "We use an actual salt and anti-skid mixture we drop right in the center of the road, right before the storm hits," says Superintendent Bill Routzahn. "As the precip falls, it helps melt whatever is falling." And that helps get it off the road, says Routzahn.

There have been numerous vehicle crashes in the county, but so far nothing serious.

Routzahn says if you have to go out today, take it easy since there could be some icy spots on the road. "You never know where your going to hit an icy spot," he says.

The National Weather Service says it will be cloudy on Thursday, then gradually become sunny with highs near 39.