A heavy late inning downpour did nothing to dampen spirits Monday night as baseball fans -- many armed with orange umbrellas -- stayed to the end at AT&T Park to watch the San Francisco Giants clinch a trip to the World Series.

The drenching followed an earlier half inch of rain that stopped in the late morning.

Monday night, the National Weather Service said its gauge in San Francisco was broken so it could not measure how much fell on Game 7 of the National League Championship Series.

From umbrellas in San Francisco to snow chains along Interstate 880, a cold front from Alaska had people preparing for the change of seasons as it pushed storm clouds across Northern California, carrying the Bay Area's first rain of the season.

It hadn't rained in the Bay Area since June 4, according to the National Weather Service.

"It's been awhile," said forecaster Diana Henderson, with the National Weather Service in Monterey.

Elsewhere, the storm spawned at least one tornado that touched down 40 miles north of Sacramento. Only minor damage was reported when it hit at 3:15 p.m. near Yuba City.

The forecast is for continued scattered showers for the next week, with the highest chance of rain in the next two days.

"This is pretty much the start of the season," Henderson said.

Temperatures dipped to a chilly 50 degrees before dawn in San Jose, rising to 62 degrees in the afternoon.

Elsewhere, temperatures were in the mid-60s during the day, with highs of 67 and 68 recorded in Santa Cruz and San Jose. Moffett Field had a low of 54 and a high of 64.

Forecasters see a fairly normal rainy season, compared with last year, which brought just half the normal rainfall. But the year before that, there was about a third more rain than normal.

The heaviest rainfall was in the northern parts of the Bay, where clouds dumped 0.51 inch on San Francisco and 1.5 inches on Kentfield.

Further south, it tapered off. The Moffett Field weather station recorded 0.17 inch of rain, and San Jose saw 0.13 inches.

The storm system originated in the Gulf of Alaska and has stalled over the Pacific Northwest, bringing colder temperatures and gusty winds of up to 80 mph at the crests of the Sierra.

The Associated Press contributed to this report. Contact Pete Carey at 408-920-5419