Walking pneumonia is also known as mycoplasma pneumonia.

Mycoplasma pneumonia (also known as "walking pneumonia") is a form of bacterial pneumonia caused by the bacterial species Mycoplasma pneumoniae. It is also known as PPLO, which is an acronym for Pleuro Pneumonia Like Organism.

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the answer to you question is   jet streams

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes