Tropical upper tropospheric trough
https://en.wikipedia.org/wiki/Tropical_upper_tropospheric_trough
A tropical upper tropospheric trough (TUTT), also known as the mid-oceanic trough, is a trough situated in the upper-level (at about 200 hPa) tropics. Its formation is usually caused by the intrusion of energy and wind from the mid-latitudes into the tropics. It can also develop from
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