Surface Roughness
1004 mb
1008 mb
The decrease in wind speed and deviation to lower pressure
depends on surface roughness.
Smooth surfaces (water) show least slowing and deviation
(typically 20o-30o from
geostrophic).
Rough surfaces (mtns) show most slowing and deviations
(typically 30o-40o from
geostrophic).
Mtns
Water
20o-30o
30o-40o