(Bloomberg) — Hurricane Gonzalo grew into a major storm that threatens Bermuda later this week, while half a world away Tropical Storm Ana may become the second system this year to sweep Hawaii's Big Island.

Gonzalo, with top winds of 115 miles (185 kilometers) per hour, was about 770 miles south of Bermuda as of 5 p.m. East Coast time yesterday. It is a Category 3 system on the five-step Saffir-Simpson scale and may reach Category 4 strength today, the U.S. National Hurricane Center said.

"I think it has a good shot at Category 4," said Jeff Masters, co-founder of Weather Underground in Ann Arbor, Michigan. "It would be the first in the Atlantic since 2011. I don't think there is anything out there to slow it down."

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