Winter Storm Jett is about to crash in like an unwelcome holiday weekend houseguest for much of the Midwest and Northeast. Cities from Chicago to New York and Boston will have to deal with Jett’s rain and snow. The Appalachians will face the dual threat of ice and wind, especially on Saturday before warmer air surges northward from the Gulf. Some power outages are possible. For many, Jett will take both weekend days, so make your holiday weekend plans inside.