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A tropical upper tropospheric trough (TUTT), also known as the mid-oceanic trough, [1] 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 the inverted trough adjacent to an upper level anticyclone.
Satellite image of an upper tropospheric cyclonic vortex in the western North Pacific. An upper tropospheric cyclonic vortex is a vortex, or a circulation with a definable center, that usually moves slowly from east-northeast to west-southwest and is prevalent across Northern Hemisphere's warm season.
The upper-level environment was extremely complex, with a tropical upper tropospheric trough (TUTT) cell having developed just to the southwest, another upper-level low to the southeast and an induced anticyclone just to the south and extending over Noru. The aforementioned TUTT cell to the southwest was also providing a weak source of outflow.
Despite the presence of dry air near the center, the storm slowly intensified as the convection deepened, and the outflow was amplified by a tropical upper tropospheric trough to its northeast. [7] [8] Hot towers developed into tightly wound rainbands, a sign of a maturing tropical storm. [9]
Image of an upper tropospheric cyclonic vortex in the western North Pacific, a cold-core low. A cold-core low, also known as an upper level low or cold-core cyclone, is a cyclone aloft which has an associated cold pool of air residing at high altitude within the Earth's troposphere, without a frontal structure.
Outflow, in meteorology, is air that flows outwards from a storm system. It is associated with ridging, or anticyclonic flow. In the low levels of the troposphere , outflow radiates from thunderstorms in the form of a wedge of rain-cooled air, which is visible as a thin rope-like cloud on weather satellite imagery or a fine line on weather ...
The tropospheric polar vortex was first described as early as 1853. [2] The stratospheric vortex's SSWs were discovered in 1952 with radiosonde observations at altitudes higher than 20 km. [ 3 ] The tropospheric polar vortex was mentioned frequently in the news and weather media in the cold North American winter of 2013–2014 , popularizing ...
Representation of alternating troughs and ridges in upper-level westerlies for the Northern Hemisphere, with regions of convergence and divergence labeled.. A trough is an elongated region of relatively low atmospheric pressure without a closed isobaric contour that would define it as a low pressure area.