Hurricane Hector regained strength in the eastern Pacific late on Sunday and swelled into a Category 4 storm again with sustained 140 mph winds as it stayed on target to possibly hit Hawaii by midweek, officials said.

Some predictions put the storm on a virtual collision course with the Kilauea Volcano on the southern part of the island. Lava has been spewing from vents on its eastern flank since May 3 and its summit crater is collapsing.

The National Hurricane Center put Hector about 1,130 miles southeast of Hawaii's Big Island and its hurricane force winds stretched 30 miles out from its center with tropical force winds of 74 mph extending out 105 miles, the NHC said.

It was expected to pick up speed from its 14 mph westward crawl into the central Pacific on Monday, the center said in an advisory late on Sunday.