In this articleDIACOINLLYNVOZSMETAAMDNVDAThis is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox.Happy Tuesday. I found yesterday's snowfall to be quite idyllic, granted I didn't actually step foot outside until it had stopped (don't repeat that to my many colleagues who found themselves on shoveling duty).S&P 500 futures are little changed this morning following a losing day.Here are five key things investors need to know to start the trading day:1. Manic MondayTra ...