SAN DIEGO (FOX 5/KUSI) — Much of Southern California will be under a flood watch this week and San Diego officials are prepping for the rain and reminding residents that sandbags are available.

A Flood Advisory was issued by the National Weather Service (NWS) at 6:19 a.m. from the Riverside/San Diego County line south to the Mexican border, particularly the coastal areas and valleys.

The NWS San Diego CA issued an updated flood advisory at 9:33 p.m. on Thursday ... Drive at a reduced speed during wet weather. Water depth - The deeper the water, the sooner a vehicle loses ...

Get top local stories in San Diego delivered ... In Arkansas, weather officials pleaded with people to avoid travel unless absolutely necessary due to widespread flooding. BNSF Railway confirmed ...

Weather forecasters sometimes warn of storms ... Here’s what to know about how scientists determine how extreme a flood is and how common these extreme events are becoming.

Backers of San Diego County Supervisor candidate Vivian Moreno on Thursday agreed to stop using photos of flood survivors in two campaign ads after survivors objected that their photos were used ...