WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO 6 AM CST SATURDAY... * WHAT...Lake effect snow expected. A period of heavy lake effect snow with rates of 1 to 2 inches per hour and poor visibility. Total snow accumulations between 2 and 4 inches. Locally higher amounts possible, especially along the Porter County line. * WHERE...Northern La Porte and Southern La Porte Counties. * WHEN...From 9 PM this evening to 6 AM CST Saturday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Travel conditions will deteriorate quickly within the lake effect snow band. Visibility of less than 1 mile and snow covered roads will create highly variable and dangerous travel conditions over small distances. Interstates impacted will include I 90 and I 94. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. During lake effect snow, the weather can vary from bands of locally heavy snow to dry weather just a few miles away. Visibilities can also vary greatly. Be prepared for rapid changes in weather, visibility, and road conditions.