.Pleasantly mild across most of the country before a surge of cold airreaches the Great Lakes on Friday and down the East Coast on Saturday......Showers and thunderstorms over the Ohio Valley will reach theAppalachians and the Mid-South Thursday night before moving through theEast Coast on Friday......A quick round of light snow expected to move across the Midwest, OhioValley, and then the southern Appalachians on Saturday...A relatively quiet weather pattern is in store across the U.S. ...