[Sunburn]

This is the reference I was looking for

7110.65 2-9-3
Include the following in ATIS broadcast as
appropriate:
a. Airport/facility name, phonetic letter code, time
of weather sequence (UTC). Weather information
consisting of wind direction and velocity, visibility,
obstructions to vision, present weather, sky condition,
temperature, dew point, altimeter, a density
altitude advisory when appropriate and other
pertinent remarks included in the official weather
observation. Wind direction, velocity, and altimeter
shall be reported from certified direct reading
instruments. Temperature and dew point should be
reported from certified direct reading sensors when
available. Always include weather observation
remarks of lightning, cumulonimbus, and towering
cumulus clouds.
NOTE ASOS/AWOS is to be considered the primary source of
wind direction, velocity, and altimeter data for weather
observation purposes at those locations that are so
equipped. The ASOS Operator Interface Device (OID)
displays the magnetic wind as “MAG WND” in the
auxiliary data location in the lower left-hand portion of the
screen. Other OID displayed winds are true and are not to
be used for operational purposes.