Through Thurs, temperatures will trend warmer with a moderate risk of heat related illnesses for West Side Valleys. Additionally, thunderstorms will return to the forecast, primarily for the East Side and northern California. Temperatures trend cooler late in the week and into the weekend. With no significant rainfall expect through this week, smoke from active wildfires will maintain hazy conditions and periods of degraded air quality. Cooler and wetter conditions are forecast early next week.