The National Weather Service issued a flash flood alert for the San Gabriel Valley and Los Angeles County Thursday and warned of possible mudslides in Station Fire burn areas.
The advisory, which stays in effect until 4:45 p.m., could bring rain at a rate of more than 1.5 inches per hour, according to the NWS. The storm is also producing hail and lightning in some areas, the weather service reports.
"...Doppler Radar continued to indicate a cluster of strong thunderstorms over central Los Angeles County...capable of producing flash flooding," the warning states. "
"This storm was also impacting the Station Fire burn area...where there is still the potential for debris flows," NWS warns.
The "strongest storm" is located above the communities of La Canada Flintridge, Montrose, Pasadena, and Altadena, according to the NWS.