Extreme heat is coming for Southern California in what meteorologists are calling the most significant heat wave of the summer this week. Starting Wednesday, temperatures are expected to be 10 to 15 degrees hotter than normal across the region.

<p>Extreme heat is coming for Southern California in what meteorologists are calling the most significant heat wave of the summer this week. Starting Wednesday, temperatures are expected to be 10 to 15 degrees hotter than normal across the region.</p>