With a winter storm warning now in effect for the entire Houston area, several public entities and other organizations are already announcing closures for the coming days. Houston Mayor John Whitmire is urging drivers to stay off the roads beginning late Monday, Jan. 20, and only essential city personnel are required to report to work on Tuesday, Jan. 21, after the Martin Luther King Jr. Day holiday. All Metro services will be suspended beginning at 9 p.m. Monday. According to Space City Weather,…