Shoppers are stocking up on supplies as they prepare for what could be the first hurricane to hit the state in more than 20 years. Weather officials said Wednesday an approaching storm appears to have strengthened and will likely maintain its speed as it heads toward the islands.

Hurricane Iselle loomed about 600 miles east, spinning at about 85 mph. It previously had been expected to weaken significantly before reaching land. The storm is expected to lash the Big Island today with damaging winds, heavy rains and high surf. It’s on track to remain hurricane-strength or weaken only to a strong tropical storm. Hurricane Julio, meanwhile, swirled closely behind at about 75 mph. Forecasters expect it to pass north of the Big Island this weekend.

The last time Hawaii was hit with a tropical storm or hurricane was in 1992.

— From wire reports