Simplify the following text for a Grade 11 native English-speaking person.
Original: A mesocyclone is a vortex of air , approximately 2 to 10 miles in diameter ( the mesoscale of meteorology ) , within a convective storm .
Simplified: A mesocyclone is a vortex of air , about 2 to 10 km in diameter ( the mesoscale of meteorology ) , inside a convective storm .