The excessive heat warning will continue through 8 p.m. Monday, while the red flag warning will be in effect from Friday at 3 p.m. through 11 p.m. Saturday.
A red flag warning means that critical fire weather conditions are either occurring now, or will shortly, the National Weather Service explained.
The National Weather Service said dangerously hot conditions, in some places reaching or exceeding 110 degrees during the day and the low 70s at night, are forecast for Lake County until Monday evening.
Along with the record heat, there is forecast to be dry relative humidity and winds with gusts of up to 25 miles per hour, leading to red flag warning through Saturday night.
The situation has led to a mobilization of community cooling centers that will be open through the weekend to offer a safe place during the hottest daytime hours.
Email Elizabeth Larson at