Be prepared for a wet day

Bundle up and take out the umbrellas because it’s looking like a cold, soggy day in The City – don’t forget about possible flight delays and roadway flooding, too.

While snowflakes fell on the mountaintops around the Bay Area overnight, it rained about a half an inch in The City and will likely rain that much today, too.

National Weather Service forecaster Bob Benjamin said to expect showers into the evening and high temperatures in the mid-40s. Look out for snow falling in mountainous ranges above 1,500 feet, too, Benjamin said.

Just before 7 a.m. San Francisco International Airport’s flights were on time, but Duty Manager Chris Davison said travelers should expect anywhere from 60- to 90-minute delays with the rain.

The California Highway Patrol is also warning drivers to look out for highway flooding, especially on Interstate Highway 280 near Mariposa Street, because that’s where it flooded overnight.

CHP Peter Van Eckhardt said he’ll tell drivers the same thing any CHP officer would tell drivers: slow down.

“The only thing you can change is your speed. You can’t change that it’s raining. You can’t change your tires,’’ Eckhardt said.

He also explained that drivers should know when they hydroplane to take their foot off the brakes and get a firm grasp on the steering wheel until the tires catch traction again.

The National Weather Service also issued a frost advisory for coastal areas.

The U.S. Coast Guard was not too worried about choppy waters for all the boaters, but still wants them to sail with caution.

BART and Muni hadn’t caught any snags as of  7:30 a.m.

The rain is supposed to clear up by tomorrow to make room for the sun with temperatures in the 50s, Benjamin said.

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