"Julian Scarfe" wrote in message
...
I'm puzzled. Why is the rotation of wind direction between surface and
say
2000 ft as low as it is?

The classic explanation of the difference between surface wind and
geostrophic wind, e.g.

http://ww2010.atmos.uiuc.edu/(Gl)/gu...r/fw/fric.rxml

"Isohume" wrote in message
...
You forgot to account for surface friction....this is what causes the
imbalance between the PGF and coriolis near the surface.

No, take a look at the diagram. I just resolved the forces perpendicular to
the surface friction.

Julian Scarfe