(Reuters) – Temperatures in all 50 U.S. states dipped to freezing or below on Tuesday as an unseasonably cold blast of weather moved across the country, while heavy snow prompted a state of emergency in western New York. In the U.S. South, states were bracing for a record chill from the Arctic-born cold that swept the Rocky Mountains last week. Every U.S. state, including Hawaii, was bitten by temperatures at the freezing point of 32 […]