Meteorologists are projecting high temperatures in Southern California this week, with the heat predicted to top 100 degrees in the San Fernando Valley.

A map shows areas in California where temperatures are expected to surpass 100 this week. There has been an early-season heat wave in Southern and Central California. On Monday, people in four states including California were warned of dangerous fire weather condition s.

Much of Southern California has been placed under a heat advisory on Tuesday as the first day of a four-day heat wave arrives. A ridge of high pressure will result in an extended period of hot weather this week,