GALVESTON, Texas - Howling ashore with 110 mph winds, Hurricane Ike ravaged the Texas coast Saturday, flooding thousands of homes and businesses, shattering windows in Houston's skyscrapers and knocking out power to millions of people.

At first light, it was unclear how many may have perished, and authorities mobilized for a huge search-and-rescue operation to reach the more than 100,000 people who ignored warnings that any attempt to ride the storm out could bring "certain death."

"The unfortunate truth is we're going to have to go in ... and put our people in the tough situation to save people who did not choose wisely. We'll probably do the largest search-and-rescue operation that's ever been conducted in the state of Texas," said Andrew Barlow, spokesman for Gov. Rick Perry.

With the winds still blowing and many roads impassable, authorities in some places could not venture outside to get a full look at the damage, but they were encouraged that the storm surge topped out at only 13.5 feet - far lower than the catastrophic 20-to-25-foot wall of water forecasters had feared.

The storm, nearly as big as Texas itself, blasted a 500-mile stretch of coastline in Louisiana and Texas. It breached levees, flooded roads and led more than 1 million people to evacuate and seek shelter inland.