Spring thunderstorm and rain in SoCal Forecast – NBC Los Angeles

Thunderstorms are possible in parts of Southern California on Thursday during another day with excessive heat warnings.

More record highs are likely to fall again on Thursday as a high pressure system also carries monsoon moisture into the area, which will fuel thunderstorms. Lightning strike will be the top concern during a high risk fire week.

NBCLA’s First Alert Radar found a couple of cells in Orange County Thursday morning. Strong winds are also possible.

Lancaster peaked at 113 degrees on Wednesday, breaking the June 16 record of 111 degrees set in 1961. Palmdale hit 112 degrees, breaking the 1961 record of 110 and just one degree below the June record. Sandberg also set a record of 101 degrees, breaking the record of 98 that was set on June 16, 1961.

The California Independent System Operator, who manages the state’s power grid, issued a Flex Alert Thursday from 5:00 p.m. to 10:00 p.m. urging residents to voluntarily reduce their electricity usage to relieve the system and avoid potential blackouts. Residents were asked not to use any major devices during the alarm, to turn off unnecessary lights, and to set thermostats to 78 degrees or higher.

Cooler conditions move in late Sunday when all heat warnings expire.