Hurricane Delta rapidly intensified into a dangerous Category 4 storm with 145 mph (230 kph) winds Tuesday while following a course to hammer southeastern Mexico and then continue on to the U.S. Gulf Coast later in the week.

The worst of the immediate impact was expected along the resort-studded northeastern tip of Mexico’s Yucatan Peninsula, where hurricane conditions were expected Tuesday night and landfall early Wednesday.

From Tulum to Cancun, tourism-dependent communities still soaked by the remnants of Tropical Storm Gamma could bear the brunt of the storm.

In Cancun, long lines snaked from supermarkets, lumber yards and gas stations as people scrambled for provisions under mostly sunny skies. Officials warned that residents should have several days of water and food on hand. Boat owners lined up at public ramps to pull their craft out of the water.

Mexico evacuated thousands of tourists and residents from coastal areas along its Riviera Maya. Some 160 shelters were opened in Cancun alone.

Quintana Roo Gov. Carlos Joaquín said Tuesday night that the government had made preparations, but “it is a strong, powerful hurricane. He said the area hadn’t seen one like it since Hurricane Wilma in 2005.

Some hotels that had exemptions because their structures were rated for major hurricanes planned to shelter their guests in place and testing their emergency systems.

The official definition of rapid intensification of a hurricane is 35 mph in 24 hours. Delta increased in strength 80 mph, more than doubling from a 60 mph storm at 2 pm EDT Monday to 140 mph at 2 pm EDT Tuesday.

Delta was predicted to arrive with an extremely dangerous storm surge raising water levels by as much as 9 to 13 feet (2.7 to 4 meters), accompanied by large and dangerous waves and flash flooding inland.

The storm was centered about 180 miles (290 kilometers) east-southeast of Cozumel, Mexico, on Tuesday evening and it was moving west-northwest at 17 mph (28 kph).

Once Delta moves on from Mexico, it is expected to regain Category 4 strength over the Gulf of Mexico as it approaches the U.S. coast, where landfall around Friday would be followed by heavy rainfall across the southeastern United States.

The Associated Press