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- As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm. This convergence of warm air in the updraft, and this cool air, causes a rotating wall cloud to form. The RFD also focuses the mesocyclone's base, causing it to siphon air from a smaller and smaller area on the ground.
en.wikipedia.org/wiki/Tornadogenesis
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As the updraft rotates and ingests cooler, moister air from the forward flank downdraft (FFD), it may form a wall cloud, a spinning layer of clouds lowered from ambient storm cloud base under the mid-level mesocyclone. The wall cloud tends to form closer to the center of the mesocyclone.
As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm. This convergence of warm air in the updraft, and this cool air, causes a rotating wall cloud to form.
As the mesocyclone lowers below the cloud base, it begins to take in cool, moist air from the downdraft region of the storm. The convergence of warm air in the updraft and cool air causes a rotating wall cloud to form.
Simultaneous tornadoes from two different mesocyclones. Looking west, the left tornado is in the tornado from the older mesocyclone. The right tornado, without a condensation funney yet, is seen by the debris cloud and is becoming better organized in newer mesocyclone. Close
6 days ago · Frequently, the maturation of the mesocyclone is heralded at the bottom of the cloud by a lowering of a portion of the thunderstorm’s base in the area of the updraft. This approximately cylindrical extension is known as a wall cloud.
The visual clue is called a wall cloud (credit: NOAA Photo Library), which is a local lowering of the cloud base in the mesocyclone. Wall clouds form when air from the forward-flank downdraft region of the storm, which has been cooled via evaporation, gets drawn back into the updraft.
May 25, 2023 · Mesocyclones are rotating air columns associated with intense thunderstorms that can form tornadoes, hail storms, strong winds, and heavy rains. Scientists use radar data, modeling, and field observations to study mesocyclones and improve severe weather forecasting.
