Don’t be fooled by Hurricane Harvey’s quick, eight-hour transition from a Category 4 monster with sustained winds of 130 mph winds to a Category 1 with 90 mph winds. Experts say the storm’s destruction is probably just beginning.The storm surge — the wall of water pushed inland by the storm — will gradually subside later today, but officials are worried about “potentially catastrophic” rainfall that will continue for days, with more than 40 inches and flash flooding possible even well inland, said Eric Blake, a hurricane specialist at the National Hurricane Center in Miami.Hurricanes almost always lose strength quickly after making landfall and moving away from the warm waters that fuel their winds.