Wind and torrents of rain were part of fall's first storm Tuesday that flooded roads, felled trees, snuffed out power and contributed to crashes across Napa County.

Public works employees scrambled from clogged storm drains to down trees until rains quieted in the early afternoon.

At about 8:30 a.m., a big rig jackknifed on Highway 29 south of Imola.

It took crews four hours to untangle it from a metal center divider, according to California Highway Patrol spokesman Officer Jaret Paulson. The driver of the truck was uninjured.

In the same location at about 2 p.m., a white Chevy Camaro rear-ended a Caltrans truck. The Chevy flipped onto the guardrail.

A three-vehicle collision on Highway 221 at Magnolia at about 1 p.m. sent two people to Queen of the Valley Medical Center with minor injuries.

A crash reported on Mt. St. Helena Tuesday afternoon also resulted in injuries, though no further information was available, Paulson said.

There were several other non-injury crashes that were cleared quickly and presented no obstacles to traffic, he said.

Most of the crashes were a result of drivers driving too fast for the conditions, Paulson said. Some of the vehicles had tires that were bald or nearly bald.

At the storm's height, more than 3,000 Pacific Gas and Electric customers lost power.

All but 10 customers had power again by 7 p.m., said PG&E spokeswoman Katie Romans.

About 2,000 customers on streets such as Third Street, Julian Avenue and Second Avenue along Coombsville lost power at 10:19 a.m. They were back up by 11 a.m., Romans said.

Other outages included 600 customers at Coombsville Road at Third Street, 100 at Coombsville Road at Fabiola Drive, and 300 customers at Coombsville Road at Silverado School.

There were scattered outages in other areas across the county as well, Romans said.

The storm soaked weak tree branches and brush with water, making them heavier than usual, she said. Some fell or were blown into equipment, causing the outages.

Romans warned residents to be prepared for outages as the storm progresses through the area over the next day or two. Keep a battery powered flashlight and radio handy, she said. Residents should also freeze water in a tub for the refrigerator should there be extended outages.

"Our crews are kind of working against the weather because the storm continues to change and evolve," she said.

Anyone who sees a downed power line should stay away from it and call 911 or notify PG&E at 1-800-743-5002.

The storm also caused minor rock and mud slides, such as one that crossed Butts Canyon Road just before the Lake County line, according to the Napa County Roads Department.

It also toppled trees onto roads such as Conn Valley Road at Greenfield and Buhman Road a half mile from Old Sonoma Road.

Plugged storm drains and drainage ditches kept Napa Public Works crews busy on the 500 block of Soscol Avenue, Forest Drive off of Redwood Road, the 2000 block of Big Ranch Road and other areas.

There was additional flooding on roads across the city, including at Jefferson at Lernhart, where water blocked a lane of traffic.

Andy Mussoline, an Accuweather meteorologist, said at 5 p.m. Tuesday, a rain counter at Napa Valley Airport measured 3.36 inches of rain since 4 a.m. Tuesday. Winds were measured gusting at up to 39 mph, with a statewide peak gust measured in San Francisco at 62 mph.

The worst of the storm is expected to have passed Tuesday, and Mussoline said by Wednesday morning there will be only a few showers, continuing off and on throughout the day with cloudy conditions.

The sun is forecast to return on Thursday, with a prediction of partly sunny skies with a high of 72 degrees.