The image is being over-exposed if it is turning white, you need to make the camera compensate for it,
Would help to know what camera you have.
#1-Most Digital cameras have different metering modes, try setting it to spot metering, aim the camera away from the brighter part of the sky and take your meter (you may need to keep the firing button half depressed) point it back towards the brighter part of the sky and depress fully.
#2-If your camera allows you can set it for negative compensation of 2/3 to 2 stops, bracketing, if your camera can then bracket down a stop or so.
#3-Set your white balance manually.