HOUSTON — With its flood defenses strained, the crippled city of Houston anxiously watched dams and levees Tuesday to see if they would hold until the rain stops, and meteorologists offered the first reason for hope — a forecast with less than an inch of rain and even a chance for sunshine.The human toll continued to mount, both in deaths and in the ever-swelling number of scared people made homeless by the catastrophic storm that is now the heaviest tropical downpour in U.S. history.The city's largest shelter was overflowing when the mayor announced plans to create more space for thousands more people by opening two and possibly three more mega-shelters."We are not turning anyone away. But it does mean we need to expand our capabilities and our capacity," Mayor Sylvester Turner said. "Relief is coming."Louisiana's governor offered to take in Harvey victims from Texas, and televangelist Joel Osteen opened his Houston megachurch, a 16,000-seat former arena, after critics blasted him on social media for not acting to help families displaced by the storm.Meteorologists said the sprawling city would soon have a chance to dry out.When Harvey returns to land Wednesday, "it's the end of the beginning," National Hurricane Center meteorologist Dennis Feltgen said.Harvey will spend much of Wednesday dropping rain on Louisiana before moving on to Arkansas, Tennessee and parts of Missouri, which could also see flooding.But Feltgen cautioned: "We're not done with this.