Option d. all of these are the correct
What are supercell thunderstorms?
Moderate to strong vertical speed and directional wind shear in the 0-6 km layer; typically a "curved" hodograph in the lowest 0-3 km and a straight line above dynamic process important leading to a steady-state storm. Large severe storm occurring in a significant vertically-sheared environment; contains a quasi-steady, strongly rotating updraft (mesocyclone) that typically moves to the right of the mean wind.
The supercell, which frequently produces strong winds, big hail, and persistent tornadoes, is perhaps the most destructive type of convective storm. In its most basic form, it consists of a single, essentially constant spinning updraft and its corresponding downdraft, which may last for several hours. It frequently develops from multicell storm systems, and even in its quasi-steady phase, it could have a number of minor rain centres that are enmeshed inside a larger, all-encompassing cellular structure. However, it appears that the supercell is dynamically distinct from regular convection based on its overall structure and course of evolution.
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