61°
Mostly clear
FRI
 74°
 53°
SAT
 80°
 52°
SUN
 88°
 54°
MON
 88°
 55°
TUE
 82°
 56°

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Wrap up your pipes and plants, freezing temperatures on the way

  • Michelle Little lets her son David jump in a muddy puddle with his rainboots while on a walk in Ragle Ranch Regional Park with him and his sister Emily, in the stroller, on Monday afternoon, Nov. 22, 2010. (CHRISTOPHER CHUNG/ PD)

Frigid Arctic air from northern Canada will bring sub-freezing temperatures to the North Bay beginning Tuesday and lasting through Thanksgiving, the National Weather Service said Monday.

Overnight temperatures will dip as low as 25 on Wednesday morning and 28 on Thanksgiving morning, forecaster Steve Anderson said.

“This is winter. Get the down blankets out, bring small pets and plants indoors,” he said. “Get ready for a freeze.”

Scattered showers are expected to continue through Tuesday morning. Daytime temperatures will be in the lower 40s to mid-50s on Tuesday, with snow falling above 1,500 feet in the North Bay hills.

As the weather dries out tonight, the mercury will plunge, bringing the coldest weather of the season with “near-record lows possible,” the weather service said.

The coldest North Bay valleys will record overnight lows in the 20s from Tuesday night through Friday morning, with “several hours of freezing temperatures possible,” according to a hazardous weather outlook issued by the weather service Monday morning.

Why the cold?

The airs pushing in from Northern British Columbia, where the temperature sank to 28 below zero on Monday, Anderson said.

It's not going to get that cold in Northern California, but with temperatures in the 20s Sonoma County will experience a “hard freeze,” said John Feerick, a senior meteorologist with AccuWeather.

“I definitely think there's going to be problems with frost,” Feerick said.

Citrus, tropical and other plants that favor temperate climates are at risk when temperatures drop below freezing, said Kris Kepa, a plant buyer with Harmony Farm Supply and Nursery.

“Make sure everything's well watered,” Kepa said. “I know it's been raining but you never know.”

String large-bulbed Christmas lights on citrus and avocado trees to help protect them from the cold air, Kepa said. She also recommended that gardeners cover smaller plants with frost blankets or spray an antitranspirant spray, such as Wilt Proof or Cloud Cover. Make sure the plants are well watered before spraying, she said.

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