Light winds brought vog to Oahu Tuesday as surf on the north shore reached warning levels.
The National Weather Service expects a cool night with temperatures again dropping into the 60s Wednesday morning.
"The vog should be retreating by tomorrow," said Derek Wroe, a meteorologist with the National Weather Service Honolulu office. He said a weak cold front is approaching the islands and tradewinds should pick up ahead of the front and blow the vog away from Oahu by Wednesday morning.
The cold front should also bring an increased chance of windward and mauka showers Wednesday night.
The light winds and rising swell of 12 to 15-plus feet created ideal conditions for professional surfers at the Billabong Pipe Masters Tuesday morning. Winds are expected to be light Wednesday morning, but a new swell arriving Tuesday night promises waves of 20 to 30 feet, potentially too big to hold the contest.
A high surf warning for north- and west-facing shores of most islands is in effect through 6 a.m. Thursday, National Weather Service forecasters said. Hawaii island and the west shore of Maui are excluded.
North shores could see 20- to 30-foot faces Wedneday, with west shores rising to 15 to 20 feet.
Another swell is expected to arrive on north and west shores Friday night.
And another cold front could move over the state this weekend, bringing an increased chance of rain.