Good morning D.C. We hope you enjoy today’s slightly more seasonal high of 46 before we return to 70 by the weekend. Channel 9 is also warning that a few (gasp) flurries may make an appearance this evening. Metro Safety Under Scrutiny: Investigators are looking into several aspects of Sunday’s Metro train derailment near the Mount Vernon Square station. D.C. Fire officials say they didn’t receive information about the accident fast enough, leading to a…