Climatic Control FeaturesSouth AmericaTropical Upper Tropospheric Trough
Generally tilts westward with height (positive tilt) or vertically stacked.
- Convergence west of the trough, Divergence east of the trough
If Bolivian High builds east, or a strong polar vortex enters backside of the TUTT, the angle shifts west-to-east (negative tilt).
- Divergence west of the trough, Convergence east of the trough