General thunderstorms, with isolated severe thunderstorms, will be possible on Tuesday for portions of the Western Great Lakes. Isolated severe thunderstorms and heavy rain will be possible for portions of the High Plains. Widespread severe weather is not expected, however scattered thunderstorms will be possible ahead of an upper level system. With any storms that develop, small hail will be the main concern. Isolated severe weather will be possible for portions of the High Plains. The main concerns will be small hail initially, but transition to a heavy rain/wind potential overnight.