A red flag warning for critical fire danger has been issued for 3-10 p.m. today by the National Weather Service.

Gusty winds and low humidity are forecast for much of the area as a front rolls in on Friday.

"Avoid outdoor activities that can cause a spark near dry vegetation, such as yard work, target shooting, or campfires," forecasters warned.

Winds of 35-40 mph will bring increased danger of fire spread and choppy lake conditions today and Thursday.

Gusty winds and low humidity on Tuesday helped spread three fires in the Sierra Front.