Exceptionally long heat wave hitting Southern California, could last until mid-October

Key Points:

• Southern California is facing an unusually long heat wave starting Friday, with an extreme heat watch in effect for Los Angeles County through at least October 8, and possibly extending into mid-October.
• Temperatures are expected to peak on Saturday, reaching triple digits in parts of Los Angeles, Ventura, Orange, San Diego, San Bernardino, and Riverside counties, with areas like Downtown Los Angeles and Pasadena forecasted to hit 100 degrees.
• The heat wave is driven by high pressure and calm winds, and while it is expected to be less humid than the summer's heat, there is a slight chance of thunderstorms and increased humidity in mountainous areas due to a non-landfalling storm.
• Southern California has experienced a swampy summer with tropical storm remnants and warm ocean temperatures, contributing to increased mosquito populations and West Nile virus cases in Los Angeles County.
• The National Weather Service advises residents to stay hydrated, avoid sun exposure, remain in air-conditioned spaces, and ensure children and pets are not left unattended in vehicles during this prolonged heat event.