URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 650 PM EST FRI JAN 7 2011 MDZ006-007-011-080800- /O.NEW.KLWX.WW.Y.0002.110108T0900Z-110108T2300Z/ NORTHERN BALTIMORE-HARFORD-SOUTHERN BALTIMORE- INCLUDING THE CITY OF...BALTIMORE 650 PM EST FRI JAN 7 2011 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 6 PM EST SATURDAY... THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS ISSUED A WINTER WEATHER ADVISORY FOR SNOW...IN EFFECT FROM 4 AM TO 6