NWS Forecast Office Los Angeles, CA

Changing weather is on the way, with increasing heat, thunderstorms, and fire weather impacts this Tuesday through the following weekend (9/16-21). Heat will peak on Tuesday and Wednesday with a high risk for plume dominated fire behavior. Starting Tuesday, there is a small chance for dry thunderstorms, with chances increasing on Wednesday where a mix of dry and wet thunderstorms will be possible. Thunderstorm chances increase up to 10-35% on Thursday and Friday (and potentially over the weekend), when more moisture moves in and wetter storms are more likely. Dry lightning induced fire starts and gusty and erratic winds will be possible with any thunderstorm Tuesday through Sunday, while the threat of brief heavy downpours and flooding increase as early as Wednesday and last through Sunday.