ST. LOUIS (AP) — States across the nation's midsection are bracing for another round of winter storms expected to add to thick ice that already has glazed roads, grounded flights and prompted class cancellations. The storm that began hammering the southern Plains and Midwest yesterday (FRI) dumped freezing rain and was suspected in a fatal wreck in Missouri, where long stretches of freeways were ice-covered. More freezing precipitation was expected in parts of the nation's central corridor throughout most of the holiday weekend. In Kansas, the state's National Guard was mobilizing in advance of today's (SAT) storm, designating roughly 200 guardsmen to patrol key roads and help motorists stranded by icy conditions. The teams of soldiers also were to provide emergency transportation for law enforcers and other emergency responders.