Race-day update

Start times: 6:45 a.m. (wheelchair race), 7 a.m. (marathon and half-marathon). Starting point: Congress and San Jacinto in downtown Houston. Weather forecast: Clear and sunny, with temperatures ranging from 35 to 52 degrees during the race. Runners: About 27,000. Volunteers: 7,500. Spectators: Estimated 250,000 along the two courses. TV: KTRK (Channel 13), 7-10 a.m. Websites: chron.com/sports and chevronhoustonmarathon.com