A mesocyclone is a vortex of air , approximately NUMBER@1 to NUMBER@2 km in diameter -LRB- the mesoscale of meteorology -RRB- , within a convective storm .

A mesocyclone is a vortex of air , about NUMBER@1 to NUMBER@2 km in diameter -LRB- the mesoscale of meteorology -RRB- , inside a convective storm .
