For rotation within convective storms to be classified as a mesocyclone, the vortex generally needs:
to be of storm scale (2-10 km in diameter),
have reasonable (~3 km) vertical depth,
have sufficient duration (two or more successive radar volume scans),
and meet at least a minimum rotational velocity (~15 ms-1).
to be of storm scale (2-10 km in diameter),
have reasonable (~3 km) vertical depth,
have sufficient duration (two or more successive radar volume scans),
and meet at least a minimum rotational velocity (~15 ms-1).
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