PHILADELPHIA (AP) — PHILADELPHIA (AP) — The National Weather Service has posted a dense fog advisory for parts of eastern and east-central Pennsylvania overnight.

Forecasters say the advisory would remain in effect from 7 p.m. Sunday until 7 a.m. Monday. They say the fog will reduce visibility to less than a quarter-mile at times, resulting in hazardous driving conditions.

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The fog has been causing some flight delays at Philadelphia International Airport, where spokeswoman Victoria Lupica says some arriving flights Sunday have been delayed for as much as 2½ hours.

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The airport is advising travelers to check on their flight status by calling airlines, looking on www.phl.org or calling the toll-free flight information number: 1-800-745-4283.

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