From the National Weather Service:
* WHAT...A wintry mix with freezing rain and sleet is expected.
The ice will result in very slippery conditions on sidewalks,
roads and bridges, including during the evening commute on
Monday. A light glaze of ice is expected.
* WHERE...Northern Maryland, eastern West Virginia, and the
northern and central Shenandoah Valley.
* WHEN...From 11 AM to 7 PM EST Monday.
* ADDITIONAL DETAILS...Even if air temperatures rise above
freezing, the ground and other surfaces are still extremely
cold due to the recent Arctic blast. This increases the
likelihood of a glaze of ice on surfaces.
A Winter Weather Advisory means that periods of freezing rain
will cause travel difficulties. Be prepared for slippery roads.
Slow down and use caution while driving. The latest road
conditions can be obtained by calling 5 1 1.