period vary significantly over different county warning areas. The National Weather Service has deprecated the snow advisory and blowing snow advisory in favor of issuing a winter weather advisory for snow or a winter weather advisory for snow and blowing snow, respectively. Lake effect snow warning (WSW) – Very heavy lake-effect snowfall amounts of generally in 12 hours or less or in 24 hours or less are imminent or highly likely. Lake-effect snow squalls can significantly reduce visibilities with little notice. Although discontinued on October 15, 2018 and replaced with a winter storm warning for heavy lake-effect snow, it was reinstated beginning with the 2019-2020 winter storm season. Snow squall warning (SQW) – An intense, generally limited duration, period of moderate to heavy snowfall has been observed by radar. Usually accompanied by strong, gusty surface winds, significantly reduced visibility up to or less (which may reach levels creating whiteout conditions), and possibly lightning; temperature drops behind an arctic front that are sufficient to produce flash freezes, in conjunction with a significant reduction in visibility from falling and/or blowing snow, may also serve as a warning criteria factor. Snow accumulation may be significant. Deprecated Heavy snow warning (WSW) – Heavy snowfall amounts are imminent; the criteria for amounts (based on 12-hour and 24-hour minimum accumulations) vary significantly over different county warning areas. Discontinued beginning with the 2008-2009 winter storm season and replaced with the winter storm warning for heavy snow. Sleet warning (WSW; alt.: heavy sleet warning) – Heavy sleet accumulations of or more, which may cause significant disruptions to travel or utilities, are imminent or expected to occur within in 12 hours. Discontinued beginning with the 2008-2009 winter storm season and replaced by the winter storm warning for heavy sleet. Sleet advisory (WSW) – Moderate sleet accumulations of are imminent or expected to occur within 12 hours. Because sleet usually occurs with other precipitation types, a Winter Weather Advisory will almost always be used in such cases. Discontinued beginning with the 2008-2009 winter storm season and replaced with the winter weather advisory for sleet. Snow advisory (WSW) – Moderate snowfall amounts are imminent; the criteria for amounts vary significantly over different county warning areas. Under the former definition, a snow advisory could be warranted if lesser snowfall accumulations were forecast to produce travel difficulties, especially early in the winter season. Discontinued beginning with the 2008-2009 winter storm season and replaced