Fox News Weather Center

Unsettled Weather For California, Interior West This Week

A stubborn upper-level low pressure system will bring cooler, unsettled weather to California early this week while dotting the Great Basin with showers and thunderstorms through midweek.

This low pressure center or pocket of cool air aloft, currently spinning just west of San Francisco, has already brought a bout cooler air into Southern California.

That is more welcome news for firefighters who are currently in the process of containing the Springs fire.

This system will slide onshore over central California on Monday, causing showers and thunderstorms to bubble up from the Central Valley through the Sierras and into the Great Basin.

Afternoon thunderstorms can spoil outdoor activities across Reno, Salt Lake City, Boise, and Eureka.

Showers will fall as far south as Los Angeles and San Diego and there could also be a rumble or two of thunder in those areas thanks to all the cold air aloft.

The shower and thunderstorm threat will be greatest during the afternoon and evening hours with some daytime heating helping to stir the atmosphere.

Heading into Tuesday, drier air is expected to move across coastal California with the better chance for thunderstorms shifting into the Intermountain West.

Denver, Colorado Springs, and Cheyenne could get in on the thunderstorm activity by Tuesday afternoon.

As this pocket of cold air slides eastward it will keep unsettled weather in place over the Intermountain West through Wednesday and Thursday. While it certainly won't rain all the time, residents and vacationers will want to keep an eye to the sky.

Have a backup plan in case thunderstorms threaten and make sure there is a sheltered, indoor location nearby.

While a lot of the Intermountain West is suffering from severe to extreme drought, the scattered rains will be welcome news. However, if the downpours are heavy enough, flash flooding could occur as the water will just run off of the very dry grounds.

This system will eventually move out into the southern Plains late this week, with a new round of severe weather expected across parts of Texas, Oklahoma, Arkansas, and Louisiana. will have more information on the late week severe weather over the next few days.

Check out the Severe Weather Center for the latest watches and warnings for your area.