Climatic Control FeaturesSouth AmericaThe Thermal Low
Intense/Persistent in Summer, with central pressures as low as 980 hPa.
Limited to the lower atmosphere, no higher than 850-700 hPa.
In interaction with mid/upper level perturbations, it can support convection along the eastern Andes…15S-30S.
In Winter it behaves like a lee-side trough