* WHAT...High temperatures up to 104 degrees expected. Moderate to Major Heat Risk is expected at this time. * WHERE...Southern San Joaquin Valley and West Side Hills of the Coastal Range. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses. Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.