Water, water everywhere. The southern U.S. is digging out after torrential rains and tornadoes killed at least 17. Parts of Houston, America’s fourth-largest city, remain underwater as workers battle to clear roads littered with debris and abandoned cars, and to restore power to 100,000 homes. Texas Gov. Greg Abbott has declared 40 counties disaster areas, and President Obama has pledged federal funding. But that doesn’t mean Mother Nature is done: Heavy rain remains in the forecast, and with several still missing, the death toll is likely to rise.