By the time Hurricane Michael slammed into the Florida Panhandle on Wednesday afternoon, it had swollen into one of the most powerful storms ever to strike the U.S. mainland, threatening homes with a combined value as high as $19 billion.

The new estimate from property analytics firm CoreLogic is 42 percent higher than an early projection, reflecting how much the tropical cyclone strengthened over the course of a single day from abnormally warm waters in the Gulf of Mexico. With winds as strong as as 155 mph, Michael is the strongest storm to strike Florida since Hurricane Andrew in 1992 and the worst to hit the Panhandle since at least 1900.