CORPUS CHRISTI, Texas (AP) — Tropical Storm Harvey intensified Thursday into a hurricane that forecasters said would be the first major hurricane to hit Texas in 12 years.

Sustained winds reached 80 mph (129 kph) more than a day before landfall was expected late Friday between Port O’Connor and Matagorda Bay, a 30-mile (48-kilometer) stretch of coastline about 70 miles (110 kilometers) northeast of Corpus Christi.

Forecasters said a “life-threatening” storm surge along with rains and wind were likely as Harvey was intensifying faster than previously forecast. A major hurricane means winds greater than 110 mph (177 kph).

As of midday Thursday, Harvey was about 340 miles (550 kilometers) southeast of Corpus Christi, moving to the north-northwest at about 10 mph (17 kph