All ANLMET data conforms to the following convention
as regards wind direction data:

Wind direction indicates which direction the wind
is coming from.

North refers to the direction of the Artic pole of the
earth's rotational axis.  Typically called "true north".

  0 degrees is from (true) North
 90 degrees is from the East
180 degrees is from the South
270 degrees is from the West

ekeeler@anl.gov