Once-powerful Hurricane Hilda, now a weak remnant low, is passing far south of the Hawaiian Islands but will continue to bring heavy thundershowers to the Big Island through Friday.

A flash flood watch for the island remains in effect until 6 p.m. Saturday.

Hilda’s remnants might produce heavy rainfall north of its path, which could result in flash floods and mudslides across parts of the Big Island into Saturday, the Central Pacific Hurricane Center said.

The Waiakea Uka portion of Hilo received 5.6 inches of rain over 24 hours ending at 5 p.m. Thursday.

Showers will diminish later Friday as Hilda moves farther away.

The Central Pacific Hurricane Center said the storm was 275 miles south of Hilo at 5 p.m. Thursday, with maximum sustained winds of 30 mph, heading west-southwest at 14 mph.

A high-pressure system to the north is bringing tradewinds through Saturday.

Warm, humid weather will dominate in the latter part of the weekend into early next week, due to a passing trough, a region of low pressure.

This will bring a chance of locally heavy afternoon showers, the Weather Service said.

A small-craft advisory will be in effect for waters around the Hawaiian Islands until 6 p.m. Friday.

Puna portables to boost space at Campbell

Overcrowding at Campbell High School will be alleviated when portable classrooms used during emergency lava evacuations in Puna are brought in and ready for use in January.

Portable structures were used as classrooms when lava from Kilauea volcano threatened to overtake Pahoa, and Keonepoko Elementary School was shut down. The state Department of Education leased 10 portables to create Keonepoko Elementary School North in October. They will now be purchased for $1.6 million and moved.

Eight of the units will go to Campbell to reduce classroom overcrowding, and two to Kealakehe High School in a renovation project.

The eight at Campbell will provide 15 classrooms, each with air conditioning.