A storm swinging up from the southern Appalachians Wednesday night will bring a Thursday morning commuter’s nightmare to a large part of the Northeast.

The fast-moving storm will bring a few hours of heavy snow following rainy weather on Wednesday. For a short time, the snow can fall at the rate of an inch or two per hour.

Motorists should allow plenty of extra time to get around and to clean off their car Thursday.

Expect flight delays at major and secondary airports due to low visibility and deicing in some cases.

Some schools may be delayed or closed.

The worst morning commute will probably be along the I-81 corridor in Virginia, Maryland and Pennsylvania Thursday.

As the snow travels from southwest to northeast across this zone Wednesday night, roads will turn from wet to slushy in the lower elevations to even snow-covered in the mountains.

The I-95 commute in the mid-Atlantic and southern New England Thursday morning will be a bit more complicated, but slow nonetheless with the weather ranging from rain to mixed rain and snow to snow.

Road conditions from Richmond to Washington, D.C., will be just wet. However, anywhere from Washington, D.C., to Providence, R.I., unannounced patches of slush and slippery conditions can occur, especially on bridges and overpasses.

Since the bulk of the snow will not hit central and northern New England until a bit later, travel conditions will markedly deteriorate in this area during the midday (9:00 a.m. to 1:00 p.m) Thursday. Roads from central Connecticut and northeastern Massachusetts to Maine will go from wet to slushy and even snow covered in a matter of minutes.

Motorists and pedestrians should be on the lookout for icy patches Thursday evening into Friday morning as untreated areas that are still wet will become icy as temperatures dip.