Piles of snow like this one in back of the Statehouse in Trenton are contributing to fog in some areas
Piles of snow like this one in back of the Statehouse in Trenton are contributing to fog in some areas (Brian McCarthy)
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Areas of fog will be a factor in the Thursday morning commute in New Jersey.

A Dense Fog Advisory was issued by the National Weather Service for Warren, Morris, Hunterdon, Somerset and Mercer counties for visibility of a quarter mile or less. The fog is spotty in nature and forms mostly where warm air meets piles of cold snow, meaning drivers could come upon an area of fog quickly.

Meteorologist Dan Zarrow said visibility at 5:45 a.m. was down to a quarter-mile at Caldwell (Essex Co), Somerville (Somerset Co), and Trenton (Mercer Co).  Temperatures overnight were in the 40s and 50s across the state contributing to the fog.  "Once cold front is through, temperatures will start to drop and fog will dissipate later this morning," said Zarrow.

Speeds were not officially reduced on any highways or bridges. New Jersey Fast Traffic's Bob Williams said if you come up on an area of fog to keep your speeds down, use lower gears and your lower gears.

No flights were delayed at Newark Liberty or any of the area airports according to the site FlightAware.com.

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