The fire, which police said was being treated as suspicious, broke out in Arizona Road and quickly escalated to the 'emergency' level. On Wednesday afternoon, the fire was at 'advice' level.

NSW Police Media said there was no evidence to back social media claims that the fire was lit by youths who discarded lit cigarettes in the bush.

"No one at this time has come forward to say they've witnessed the start of the fire," a NSW Police spokesperson said.

The blaze that started before noon on December 31 left property owners along Arizona Road preparing for the worst as temperatures soared and the intensity of the fire caused wild winds to push the fire front in different directions until a southerly front hit after 9pm.

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The southerly wind change moved the fire north to Blue Haven and southern Wyee areas.

The RFS said firefighters are working to "protect properties in the area and slow the spread of the fire".

The fire closed sections of the Pacific Highway on the Central Coast late on Tuesday. On Wednesday afternoon, the Pacific Highway remained closed between Goorama Avenue and Lake Haven Drive. Additionally, the Doyalson Motorway Link Road was closed between the M1 Pacific Motorway and Wyee Road.

The Charmhaven fire, which was downgraded to 'advice' level at 5am on New Year's Day, has burned more than 335 hectares of bush land.

Police said another fire in the area is believed to have had its origins in arcing power lines at Wangi Road near Summerhill Drive about 11pm on New Year's Eve. The lines are believed to have arced because of high southerly winds.

Dozens of firefighters from at least 10 brigades have spent the first hours of 2020 trying to contain the flames in about 30 hectares of bush along the Awaba side of Wangi Road. Wangi Road is closed for several kilometres.

Monitor the fire through the NSW RFS Fires Near Me website or app. Monitor traffic through the Live Traffic NSW website or app.