A winter weather advisory (originally identified as a Traveler's Advisory until the 2002-03 climatological winter, and informally as such by some local television stations thereafter) is a hazardous weather statement issued by Weather Forecast Offices (WFO) of the National Weather Service in the United States when one or more types of winter precipitation—snow, rain and snow mixed, freezing rain or sleet—presenting a hazard, but not expected to produce accumulations meeting warning criteria, are forecast within 36 hours of the expected onset of precipitation or are occurring in the advisory's coverage area.