The National Weather Service has issued a Winter Weather Advisory for Prince George’s County.  The Advisory will be in effect from midnight tonight until 10 AM on Friday.  Rain is expected to start first,  then change over to snow between 1 AM and 3 AM.  A period of moderate snow is expected between 3 AM and 7 AM, before tapering off later in the morning. Roads may be slippery and snow-covered during the Friday A.M. rush hour.  A total of 0.5 – 2 inches of snow is expected.