* WHAT...Heavy mixed precipitation expected. Total snow and sleet accumulations between 9 and 16 inches. Ice accumulations of a light glaze, except in Preston and Tucker Counties, where ice could accumulate up to two tenths of an inch. * WHERE...Portions of northwest, southwest, and western Pennsylvania and northern West Virginia. * WHEN...From 7 PM this evening to noon EST Monday. * IMPACTS...Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.