Changing Stability » Advection Introduction
Advection, both at the surface and aloft, has a strong influence on the lapse rate through a given region of the atmosphere. Before making a forecast from a sounding, consider the lapse rate changes that will result from the effects of advection during the forecast period.
The advection effects may be visualized as two processes:
- Uniform advection of an air mass with a different lapse rate
- Differential advection of temperature due to vertical wind shear