Wanted to make sure I was understanding my memory correctly.  Bottom line, I was not mistaken!

In RobertS's alog 28456, he details the PEM Anemometer directions which are not standard in discussions about wind where typically, the wind direction is from where the blows.  Robert's scheme puts zero degrees at to the North and 90^o to the East and 180^o to the South, etc.  To confirm this today, Richard graciously eased my concerns with work permit and leg work up onto the roof manually positioning the direction sensor while we watched the readout.  With the tail of the sensor flowing from the CS to the EndX and the tip pointing to the South, we read close to zero degrees and continued in this fashion moving the tail of the sensor clockwise.  The attached shows a StripTool readout while Richard did this and on the phone calling out the sensor position.

So, using the wind sensor direction info must be done with this in mind and is applicable to me as I look at historic wind direction.  Namely for a standard Matlab polar plot where the angles are plotted counterclockwise, the 90 and 270^o directions are correct for the standard from direction; but, North & South are flipped and all directions 0^o +- 90^o must be flipped to 180^o +- 90^o and vice-versa.  Anyway, I'm learning/working this but if you do it, be aware.  Come see me if you care/wish.