The National Weather Service’s tornado warnings for southwest Nevada County have expired.

After two previous warnings were extended from earlier conclusion deadlines, the weather service extended the warning to 7:30 p.m. Monday.

A tornado was reported to have touched down in a rice field Browns Valley, west of Smartsville, along Highway 20, according to the National Oceanic Atmospheric Administration.

The storm’s pattern reportedly brought rotating clouds toward Grass Valley, said Jason Clapp, a NOAA meteorologist. At around 5:20 p.m., the clouds with rotation capable of producing a tornado were reported over Lake of the Pines, 10 miles northwest of Auburn, moving northeast at 25 miles per hour, according to the National Weather Service.

“We can’t guarantee it will make it to Grass Valley,” Clapp said. “It’s getting to the time of day where things start to wind down.”

Whether or not a tornado actually touched down in south county, downed trees and power lines were reported.

Rob Bartsch of the Higgins Fire Protection District said Monday evening the department had several engines off Brewer Road, responding to calls reporting downed power lines and trees.

“It got pretty windy through here for a little bit,” Bartsch said, adding that a tree actually had fallen in a large field adjacent to the fire department, although not near the building itself.

Power outages were reported in both the Alta Sierra and Grass Valley areas Monday evening.

Cloud rotation indicating the strong possibility of a tornado began over Lake Wildwood shortly before 4 p.m., reported the weather service. Residents in the area were advised to take shelter.

Other affected areas included Beale Air Force Base, Smartsville, Marysville and Timbuctoo, said Karl Swanberg of the National Weather Service.

“The Doppler Radar is indicating cloud rotation in those areas,” Swanberg said.

A tornado touched down north of the state capital Monday afternoon, but only minor damage was reported, the Associated Press reported.

The National Weather Service in Sacramento said it had no reports of injuries from the tornado, which hit about 3:15 p.m. near Yuba City, about 40 miles north of Sacramento.

“We’ve had reports of power lines down and some outbuildings damaged,” meteorologist Eric Kurth told the AP. “Some kind of a small outbuilding was lifted about 200 feet from where it was located.”

The tornado also caused damage to the Mallard Lake Golf Center as the first storm of the season moved through Northern California, he said. No one was answering the telephone at the golf course.

Kurth said the reports were confirmed by Sutter County sheriff’s deputies and firefighters.

“We’ve heard about trees being downed, power lines being downed, no injuries,” he said.

Several funnel clouds also were reported north of Sacramento, but Kurth said there were no other reports of touchdowns.

To contact Staff Writer Matthew Renda, email mrenda@theunion.com or call (530) 477-4239.