The Bay Area is primed for a second helping of wintry weather over the Thanksgiving weekend, with temperatures dipping below freezing to the south and heavy rains threatening debris flow and landslides up north.

Thanksgiving Day offered a brief reprieve from rains and heavy winds that walloped the Bay Area on Tuesday and overnight Wednesday.

But the cold persisted. National Weather Service officials said the high in San Francisco by 5 p.m. Thursday was 48 degrees, and on track to break the coldest high record for Nov. 28. The temperature was expected to tie the coldest high for any day in November, weather officials said.

The conditions made for a blissfully uneventful day of travel, with the Oakland and San Jose airports reporting no major delays or cancellations. San Francisco International Airport reported 15 delays and two cancellations, but all were because of operational issues.

Friday is expected to be chillier, with overnight lows dropping to about 41 in San Francisco and 31 in San Jose.

The next storm system is expected to arrive Saturday afternoon and stretch into Sunday, delivering far-reaching sheets of rain and strong gusts of wind from the south.

The storm is carried by an atmospheric river coming up from southwestern areas near Hawaii, said National Weather Service meteorologist Spencer Tangen.

“When you have moisture coming up from the subtropics, it’s like a fire hose of moisture pointed over the West Coast,” he said. “This time it’s pointing over the Bay Area.”

The storm presents an increased risk of landslides if the system centers over burn scars in the North Bay region, where the Kincade Fire destroyed 374 structures last month in Sonoma County.

That threat is still fairly minimal, though, Tangen said, because of the region’s abnormally dry weather this autumn.

Despite showers earlier this week, “the area still isn’t saturated yet, and that will help limit the risk of landslides to some degree,” Tangen said.

Megan Cassidy is a San Francisco Chronicle staff writer. Email: megan.cassidy@sfchronicle.com Twitter: @meganrcassidy