A Red Flag Warning is in effect throughout the weekend and on in to Monday night, with gusty winds and low humidity in the forecast.

The National Weather Service in Sacramento has issued the warning, in effect from 5 a.m. Saturday, May 16 through 8 p.m. Monday, May 18.

Weather service forecasters indicate that a Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.

Stanislaus and San Joaquin counties are included in the warning area.

Winds: North winds 20 to 30 mph. Gusts 35 to 45 mph, locally up to 50 mph around the Delta and the far western Sacramento Valley.

Humidity: Daytime minimum humidities of 7 to 15%; Overnight maximum relative humidities 30 to 55%.

Highest Threat: Along and west of the Interstate 5 corridor in the Sacramento Valley. Strongest winds are expected Saturday night through Sunday.

Impacts: The combination of gusty winds and low humidity can cause fire to rapidly grow in size and intensity. Outdoor burning is not recommended.