LOS ANGELES (AP) – California is forecast to roast through the Labor Day weekend under the influence of a massive area of high pressure that is expected to produce dangerously high heat. The National Weather Service says the heat is expected to set in Friday in the south and spread northward, peaking on Sunday or Monday. Forecasters say many temperature records are likely to fall and there is a chance that some all-time record highs will occur. The manager of the state power grid has called for voluntary conservation of electricity Saturday through Monday between the hours of 3 p.m. and 9 p.m.