Frost Advisory For Napa County: Here's How Cold It May Get

NAPA COUNTY, CA — With temperatures forecast to dip into the low 30s this weekend, the South Napa Shelter is open as an emergency warming center Saturday and Sunday nights, the county announced Friday.

The National Weather Service issued a frost advisory which is expected to be in effect Sunday morning from midnight until 10 a.m. for much of the Bay Area, including the North Bay Interior Mountains and North Bay Interior Valleys.

The National Weather Service is also predicting sub-freezing wind chill temperatures from Sunday into early Monday. Officials recommend that residents limit their time outdoors, as serious medical conditions including hypothermia and frostbite can develop with prolonged cold weather exposure.

In Napa, low temps were expected to drop to 39 degrees overnight Friday, 32 overnight Saturday and 34 overnight Sunday.

According to the National Weather Service, frost and freeze conditions can kill crops and other sensitive vegetation, possibly damage unprotected outdoor plumbing, and create hazardous conditions for livestock and those without adequate heating or shelter.

"People who do not have adequate heating should take steps to find shelter from the cold," the weather service said. "Take steps now to protect tender plants from the cold. To prevent freezing and possible bursting of outdoor water pipes they should be wrapped, drained, or allowed to drip slowly. Those that have in-ground sprinkler systems should drain them and cover above-ground pipes to protect them from freezing."

Napa Seven-Day Forecast

Friday Night
Patchy fog after 5am. Otherwise, increasing clouds, with a low around 39. Calm wind.

Saturday
Rain, mainly between 10am and 4pm. Areas of fog before 11am. High near 55. South wind 5 to 15 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night
A 20 percent chance of rain before 10pm. Patchy frost after 2am. Otherwise, mostly clear, with a low around 32. North wind 5 to 9 mph.

Sunday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 55. North northwest wind 5 to 8 mph.

Sunday Night
Patchy frost after midnight. Otherwise, clear, with a low around 34. North wind 5 to 7 mph.

Monday
Patchy frost before 9am. Otherwise, mostly sunny, with a high near 54.

Monday Night
Mostly cloudy, with a low around 39.

Tuesday
A chance of rain, mainly after 10am. Partly sunny, with a high near 56.

Tuesday Night
A slight chance of rain. Patchy fog before 1am. Otherwise, partly cloudy, with a low around 37.

Wednesday
A chance of rain, mainly after 10am. Partly sunny, with a high near 54.

Wednesday Night
A chance of rain. Mostly cloudy, with a low around 36.

Thursday
A chance of rain. Patchy fog. Otherwise, mostly sunny, with a high near 53.

Thursday Night
A chance of rain. Mostly cloudy, with a low around 38.

Friday
A chance of rain. Partly sunny, with a high near 53.