Hurricane Harvey’s destruction is on track to cost $190 billion and top the price of damage inflicted during Hurricane Katrina, says a weather forecaster.

“The disaster is just beginning in certain areas. Parts of Houston […] will be uninhabitable for weeks and possibly months due to water damage, mould, disease-ridden water and all that will follow this 1,000-year flood,” said Joel Myers, president of meteorological firm AccuWeather in a release.

The costs could mark a one percent hit to America’s GDP. If AccuWeather’s prediction is correct, it would make Hurricane Harvey the most expensive natural disaster in American history.