(Bloomberg) -- Hurricane Irma bulked up ahead of an all butcertain collision with southern Florida after devastating achain of Caribbean islands and threatening to become the mostexpensive storm in U.S. history.

While the life-threatening hurricane weakened slightly, Irmagrew in size meaning that most of the state will facehurricane-force winds as it cuts a path through the peninsula intoGeorgia.

Now a Category 4 storm with top winds of 150 miles (241kilometers) an hour, Irma will maintain its strength until itstrikes Florida early Sunday, the U.S. National Hurricane Center said in anadvisory around 11 a.m. Eastern time. The storm has alreadyleft at least 11 people dead and thousands homeless across theCaribbean.

'Long and horrible day on Sunday'

“Much of Florida, especially the southern half, is in for a reallylong and horrible day on Sunday,” said Todd Crawford, leadmeteorologist at The Weather Company in Andover, Massachusetts.Another example of “the power of nature on a heavily populatedpart of the U.S. coastline is imminent, and the costs will begreat.”

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