M3E1S1O1C3Y4C3L1O1N1E1
20 points
MESOCYCLONE is validvalid
[n MESOCYCLONES]
a rapidly rotating air mass within a thunderstorm that often gives rise to a tornado [n -S]
[n MESOCYCLONES]
a rapidly rotating air mass within a thunderstorm that often gives rise to a tornado [n -S]