Hurricane Kay gained strength in the Pacific Wednesday and began lashing Mexico’s Baja California Peninsula, where authorities prepared by opening shelters and closing some roads. Forecasters said there’s a chance outer bands of the big storm could also bring heavy rain – and possibly flash floods – to parts of scorched Southern California and southwestern Arizona Friday night and Saturday.

Kay’s maximum sustained winds rose to 105 mph (165 kph), with forecasters saying it could brush the mid portion of the peninsula Thursday or Friday.

The US National Hurricane Center in Miami said Kay was centered about 215 miles (345 kilometers) southwest of the southern tip of the Baja peninsula. Kay was moving north-northwest at 12 mph (19 kph).

A hurricane warning was issued for a sparsely populated stretch of the peninsula around Bahia Asuncion and the state government of Baja California Sur announced it was opening shelters for people who need to evacuate. It said some creeks were already rising and closed some roads.

Forecasters expected Kay to stay offshore as it moves more northward, roughly parallel to the coast, it was an expansive storm, with tropical storm-force winds extending up to 230 miles (370 kilometers) from the center.

Heavy rain continued in Los Cabos at the southern tip of the peninsula Wednesday. Mayor Oscar Leggs Castro said that there were already more than 800 people in shelters in the twin resort destinations as winds picked up early Wednesday morning.

Long lines of cars waited to fill up at gas stations. Nonessential businesses were closed.

Landslides had reportedly cut some roadways on the peninsula, but there were no reports of injuries.

In the Atlantic, Hurricane Earl strengthened northeast of Puerto Rico after dropping heavy rain across the Leeward Islands, the US and British Virgin Islands and Puerto Rico.

Earl was located about 460 miles (740 kilometers) south of Bermuda on Wednesday and was heading north at 8 mph (13 kph).

Earl had maximum sustained winds of 85 mph (140 kph) and was expected to grow into a major hurricane later this week while turning toward the open Atlantic.

Meanwhile, Hurricane Danielle was kicking up high seas far out over the Atlantic – some 625 miles (1,005 kilometers) northwest of the Azores.

It had maximum sustained winds of 80 mph (130 kph).