Vienna Under Winter Weather Advisory Tuesday 4 AM-1PM

UPDATE: Fairfax County is under a Winter Weather Advisory from the National Weather Service Tuesday from 4 a.m. to 1 p.m.

Also, federal agencies are open Tuesday. Workers have the option of unscheduled leave or telework.

Here's what the weather service says:

Precipitation will begin between 4-8 a.m. starting as snow and sleet changing to freezing rain mid-morning. Temperatures will reach the mid-30s by Tuesday afternoon.

The combination of snow/sleet and freezing rain will produce slippery road  conditions.

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Vienna is forecast to see rain, snow and sleet before 9 a.m. Tuesday, followed by rain. And the rain could be heavy at times, according to the National Weather Service.

The chance of precipitation Tuesday is 100 percent. Little or no snow accumulation is expected, according to forecasters. The high should be near 40 degrees.

Rain is expected to continue into Tuesday night, with 1 to 2 inches of precipitation possible.

Wednesday, the National Weather Service predicts rain showers before noon, with rain and snow showers likely after that.

The chance of precipitation Wednesday is 80 percent, and the area could see up to a half-inch of new precipitation.

If you're going to be on the roads for the Thanksgiving holiday, the Virginia State Police offer these tips for driving in winter weather:

• Drive for conditions. Slow down your speed when possible.
• Make sure your headlights, taillights and windshield wipers are in working order.
• Brush snow off your taillights, headlights and windows to increase visibility for yourself and other drivers.
• Increase driving distances. Give yourself more space between you and the vehicle in front of you. If you should lose control or the vehicle in front of you loses control, then you will need that extra driving space to safely react and stop.
• Always wear your seat belt.
• Give yourself extra drive time.
• Bring along your cell phone charger.

Thanksgiving Day is forecast to be sunny with a high near 35.