At a news conference Monday morning, FEMA Administrator Brock Long said that Tropical Storm Harvey will likely drive at least 30,000 people to temporary shelters as record floodwaters inundate Houston and a widening area of Texas. “This disaster’s going to be a landmark event,” Long said. More than 30 inches of rain have fallen in parts of Houston and Harris County since Saturday, and some areas are expected to get up to 50 inches, exceeding the average annual rainfall in Houston. The Brazos River, southwest of Houston, will rise to 59 feet by Tuesday, a new record, the National Weather Service predicted, prompting a mandatory evacuation in parts of Fort Bend County. “A flood of this magnitude is an 800-year event, and it exceeds the design specification of our levees,” said County Judge Robert Hebert.