WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 PM CST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches expected, except up to around 6 inches in parts of southwest Iowa. Winds gusting 25 to 35 mph. * WHERE...In Nebraska, Washington, Saunders and Lancaster Counties. In Iowa, Harrison and Shelby Counties. * WHEN...Until 6 PM CST Sunday. Light to moderate snow is expected overnight, with additional light snow through Sunday evening. * ADDITIONAL DETAILS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Expect snow covered roads and limited visibilities, and use caution while driving.