EARNIE GRAFTON / Union-Tribune Soccer players at the polo fields near Del Mar enjoyed a cool assist from the sprinkler system yesterday.

Strap in. October has arrived, and it's on a roller-coaster ride. In the span of three days, San Diego may lurch from sizzle to shiver. “Saturday could be so much different,” said National Weather Service forecaster Stan Wasowski. “People could be wearing jackets instead of Bermuda shorts. It'll feel like fall.”

San Diego public schools have seen a modest bump in student enrollment for the second straight year, breaking a downward trend that has plagued other large urban districts in California.

SAN DIEGO COURTS – A 15-year-old girl accused of killing her mother with a hammer had recently been kicked out of school and created a to-do list about killing her parents in the months leading up to the slaying, according to court documents filed by prosecutors.

San Diego-area officials said yesterday they reached a milestone in the campaign to ease traffic along the U.S.-Mexico border. Gov. Arnold Schwarzenegger signed legislation late Tuesday that allows for the construction of a tollway and border crossing east of the Otay Mesa Port of Entry.

MIRAMAR – The Blue Angels precision flying team is virtually synonymous with the annual Miramar Air Show, and that's the way the military likes it. It costs tens of millions of dollars each year to maintain these blue-and-gold fighter jets and train a group of elite Navy pilots.

Jim Grant never expected to be a hero. Last Dec. 11, however, he unexpectedly became one. Grant, 52, of Point Loma was heading to work as a project manager for a general contractor when he saw black smoke billowing from an apartment building in the Midway area. He called 911 and drove toward the smoke.