Vigilantes Nab Sex Offender | Hit-And-Run Kills Girl | Hunt For Buried Treasure | Rain: NorCal In Brief

We've rounded up the stories you may have missed over the weekend to prepare you for the week ahead.

But before we jump into Northern California's top stories, residents should expect cooler temperatures to continue through Tuesday, along with a chance of light rain.

"The current forecast shows rain totals of up to a quarter of an inch in the interior regions of the North Bay with totals a few hundredths of an inch closer to the coast and extending into the Bay Area," the National Weather Service said.

The rain is expired to hit throughout Monday and into early Tuesday, forecasters said.

SUN AM drizzle was just the start. 🌧️ An upper low moves in MON, bringing light rain across the region. The N Bay has the best chc, but showers are possible elsewhere.

⌚: MON -> early TUE
🗺️: Highest potential N Bay
⚠️: Damp roads & cool temps#CAwx #BayArea #NorthBay pic.twitter.com/Y55CCa7O5V

In other news, a 19-year-old was arrested over the weekend on suspicion of causing a chain-reaction crash that killed a girl who was riding in his BMW on I-880. The man is accused of fleeing the scene of the violent crash after the girl was ejected from his car.

Plus, police in San Mateo say a registered sex offender was nabbed in a sing operation run not by authorities, but by a group of civilians that authorities described as "an organization aimed at catching child predators." Members of the group posed as an underage person and arranged to meet up with the 43-year-old man.

Sex Offender Busted By Vigilantes' Sting Operation: San Mateo Police

Here are some other stories you may have missed:

Area Affected By Water Breach To Undergo 'Super Chlorination' Treatment

Pipes in an area of Mountain View affected by last week's water main breach will undergo a "super chlorination" treatment.

3 Arrested In East Bay Sting Targeting Online Child Exploitation

The operation targeted people seeking to exploit minors online, police said.

There's A Treasure Chest Containing Over $10K Buried Somewhere In San Francisco

The treasure is buried under a foot of earth and a set of clues that appear even more befudding than last year's.

1 Hospitalized In E-Bike Battery Fire

One person was hospitalized in connection to an e-bike battery fire.

Man Lit Car, Other Items Ablaze In Rural Mendocino County: Police

Deputies arrested a man suspected of lighting a car and other items on fire.

Teen Arrested In Deadly DUI Hit-And-Run On I-880: Police

The teenager fled the scene of the violent crash after his passenger was ejected from the car, police said.

2 Juveniles Arrested For Making Gun Threats At San Francisco Store: Police

Two juvenile suspects were arrested after allegedly brandishing a firearm and threatening a person at a grocery store, police said.

3 Killed In Highway 1 DUI Crash: Police

Three people were killed in the DUI crash, police said.

Man Arrested After Firing Unregistered Gun Out Of Vehicle: Santa Rosa PD

The man was arrested Friday night, according to police.

4 Firefighters Injured During Prescribed Burn

Two members of Cal Fire's Mendocino Unit were taken by helicopter to a burn center, authorities said.

1 Killed, 7 Injured In Wrong-Way Crashes On I-680

One person was killed and seven others were injured in the series of Friday night crashes.

7 Pedestrians Injured In Oakland Motorist's Sidewalk Hit-And-Run

The motorist drove up onto the sidewalk and into pedestrians before fleeing the scene, authorities said.