The state Department of Health issued a "brown water" advisory Friday afternoon because of heavy rainfall into Honokahua Bay, which includes D.T. Fleming Beach Park, according to an announcement.
People were advised to stay out of flood and storm waters because of possible overflowing cesspools, sewer manholes, pesticides, animal fecal matter, dead animals, pathogens, chemicals and flood debris, the department said.
Muddy water runoff has been known to attract sharks seeking dead animals.
"If coastal waters are brown, stay out," the department advised.
A sighting of a hammerhead shark on Dec. 28 closed waters off D.T. Fleming Beach on the west side to oceangoers. The area reopened the next day.
Health officials did not say when the advisory might be lifted.
The National Weather Service issued a high-surf advisory Friday afternoon for the north- and west-facing shores of Maui and Molokai from 6 a.m. today to 6 p.m. Sunday.
Generated by a North Pacific low-pressure system, the surf is expected to rise to 15 to 20 feet on north shores and 8 to 12 feet on west shores. The system will produce large, hazardous waves, rip currents and beach erosion.
The highest surf should hit shorelines tonight and Sunday morning.
For more surf information, call (866) 944-5025 or go to www.prh.noaa.gov/hnl.
Today's weather forecast predicts partly cloudy skies with isolated showers mainly in windward areas. High temperatures should range from 77 to 82 degrees, with overnight lows of 63 to 68. Winds will blow out of the north and then from the northwest from 15 to 20 mph.