Här är informationen för ASOS.
VOICE MESSAGES
ASOS computer-generated voice message are made available through telephone dial-in access and are broadcast directly to pilots via ground-to-air radio (where installed). The information contained in the ground-to-air radio broadcast message and the telephone dial-in message are identical. The voice message is composed of the body of the ASOS observation and selected remarks. Selected remarks can include variable visibility, tower visibility, or Density Altitude when 1,000 or more feet above airport elevation. Control tower personnel may add Notice to Airmen (NOTAM) or other information. Note that wind direction in the voice message is given in degrees magnetic.