low-pressure

“It’s certainly early for this time of year and an unusually deep low-pressure system,” Lund said.

A weak low-pressure system is expected to move through Southern California starting Saturday, bringing thunderstorms, winds and isolated showers to the region, according to the National Weather Service.

Lewis said the low-pressure system that is pulling another bout of tropical moisture north this week is not as strong as what played out last week.

This summer, he said, a low-pressure system has been parked over the Pacific Northwest and California, leading to unrelenting cloud cover and cooler temperatures.

Rather, this one is fueled by a low-pressure system in northern Mexico, creating similar outcomes.