"The atmosphere is really unstable," he said. Up to an inch of rain could fall in an hour, with a 20% chance of thunderstorms and risk of water spouts, dangerous wind gusts and even tornadoes.

"That's a very low probability, but the potential is there," he said.

Rainfall through Monday morning varied widely.

Long Beach recorded just a quarter of an inch by midday, while Pasadena had 1 inch, Beverly Hills 1.47, downtown .80 and Porter Ranch 2.19. To the north, Ventura saw 3.13 inches, Lompac 3.44 and the Alisal Reservoir near Solvang 5.93.

Many areas are still recovering from the four-day early February atmospheric river that inundated much of the state and dropped up to 14 inches of rain on L.A. alone.

In Rancho Palos Verdes, residents in neighborhoods vulnerable to landslides were bracing for the possibility of the saturated ground shifting underneath their houses as more rain fell.

The landmark Wayfarers Chapel closed indefinitely last week due to increasing land movement, disrupting the plans of couples who had planned to get married there.

L.A. County Supervisor Janice Hahn urged Gov. Gavin Newsom to visit the area and see the damage, noting that Rancho Palos Verdes officials planned to ask him to declare a state of emergency.

"I think if the Governor came here and saw the buckling streets, the homes sinking and cracking apart, and the historic Wayfarers Chapel on the verge of collapsing, he would understand the urgency of this request," she wrote in a news release.

Brian Ferguson, deputy director of the state Office of Emergency Services, said that people should keep their guards up, even if the rainfall seems comparatively minor.

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