That means fire-weather conditions are expected to be ripe for explosive fire behavior, per the NWS. Some areas will reach upwards of 100 degrees, as the heat wave develops in Southern California, and forecasters say residents should prepare.

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.