 It's a heat and storm alert for Wednesday. Some thunderstorms may bring some moderate to heavier rains. I'm 7 News Chief Meteorologist Veronica Johnson in the First Alert Weather Center. 78 degrees outside the WTOP studios brought to you by Dulles Glass. For all your glass, mirror and shower door needs, visit dullesglass.com. Dulles Glass, love your glass. Coming up, how to survive on Mars. That's what four NASA volunteers are learning to do.