5/12/2014 02:45 PM PDT

Red Flag Warning Extended Through Wednesday

The National Weather Service has extended a Red Flag Warning for San Diego?s mountains and valleys through 8 p.m. Wednesday due to strong, gusty winds and low humidity in the forecast. The warning has been in effect since Sunday and was previously set to expire at 8 p.m. Tuesday.

A Red Flag Warning signals critical fire weather conditions. 

A heat advisory has also been issued for coastal areas Tuesday through Thursday and for valleys on Wednesday and Thursday.

On Tuesday and Wednesday, east to northeast winds of 20 to 30 mph with gusts up to 65 and 75 mph are expected, along with a daytime humidity of as low as 5 percent. Winds are expected to be strongest in the mornings and early afternoons through Wednesday, with lighter winds in the late afternoons and evenings.

More forecast information and updates are available from the National Weather Service.