On Tuesday at 12:28 p.m. an extreme heat warning was released by the NWS San Diego CA valid from Wednesday 10 a.m. until Saturday 8 p.m. for Apple and Lucerne Valleys.

A heat wave this week is likely to bring dangerously hot conditions and increased wildfire risk to parts of California, including in the Bay Area.

An extreme heat watch has also been issued from Wednesday afternoon through Saturday evening for much of the Southern California region. Weather officials say the hot conditions will increase the risk of heat illness for everyone, especially vulnerable populations, including young children, the elderly and those without air conditioning.