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Relationship with Upper-Air
Relationship with Upper-Air
The mature cyclone will have a westward tilt with height
Upper-level divergence will be directly above the surface level low to help ventilate the storm
i.e., remove mass - make the weight of the column lower - "deepen" the low
A cyclone is intensifying if the upper-level divergence is stronger than the surface-level convergence
i.e., more weight is being removed than added
Midlatitude Cyclone Stages
Midlatitude Cyclone Stages
The cyclone is in its mature stage.
At the surface:
Surface level convergence.
Very strong cold and warm fronts.
Heaviest precip and lowest pressure.
At upper-levels:
Upper-level divergence is directly aligned above the surface low.
The upper-level low/trough is to the west of the surface low.
The cyclone is in its occluded stage.
At the surface:
Surface level convergence.
The cold front has caught up to the warm front.
Occluded front present.
At upper-levels:
The upper-level low/trough is directly aligned above the surface low.
No upper-level divergence. The system can't ventilate. The column is getting heavier, and therefore the pressure is increasing.
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