Blizzard warning in effect from 7 pm this evening to 7 pm est wednesday... The national weather service in detroit/pontiac has issued a blizzard warning...which is in effect from 7 pm this evening to 7 pm est wednesday. The winter storm watch is no longer in effect. * heavy snow...strong gusty winds...and widespread blowing and drifting snow will make travel dangerous tonight and wednesday. * white-out conditions with visibilities of one-quarter of mile or less due to intense snowfall and blowing snow. * quickly accumulating snow and blowing and drifting snow will make roads very hard to clear. * untreated roads will become slippery...snowpacked...and dangerous