Possible chance of showers, thunderstorms expected for parts of Southern California as moisture from Tropical Storm Mario increases

Parts of Southern California could experience heavy rain and thunderstorms due to the increase in moisture from Tropical Storm Mario as it moves over the region. As the storm continues to move, the region will be subject to the threat of flooding and debris flows near recent wildfire burn scars. 

National Weather Service officials say that the most hazardous impacts come early Wednesday morning due to dry lightning and strong winds. Those hazards then quickly shift come Thursday, when more moisture from the storm moves in and increases the threat of flash flooding and debris flows near recent burn scars. They say showers are likely starting at 3 a.m. on Wednesday, lasting through 10 p.m. the next night.

A KCAL News Next Weather alert will go into effect on Wednesday and last through Friday for all communities, as meteorologists warn about isolated thunderstorms. The alert has been issued to warn communities about the weather event that might impact their daily routines.

Temperatures throughout the Los Angeles and Orange County Metropolitan areas will remain in the 80s and 90s throughout the rest of the week. Moisture from the tropical storm is not expected to move into the area until later on Wednesday. The NWS said the highest chance of showers will be on Thursday.

"This is a rapidly evolving situation with a range of outcomes," said NWS officials in a post on X. 

According to the NWS forecast, between Tuesday and Friday, Los Angeles is expected to get .70 inches of rain, Riverside .40 inches, Big Bear Lake .80 inches, Palm Dale .60 inches and Oxnard .80 inches.

Tropical Storm Mario is off the coast of Mexico and will make its way toward Baja California by Wednesday night. Weather officials said it is not expected to develop into anything stronger and will have wind speeds less than 40 mph.