Strng updraft contain moisuture and above air temparature under -10 ,very occure.

Cloud occurence thunder charateristic , theses have astrong updraft witch temparatyre less than -20.

Japan in summer , top thunder between 7 and 8km; in winter of Hokuriku betwen 3 and 5km. In summer need condition to occer witch is updraft .And besides conxistence coldest air mass.

Strong sunlight day ,heat thunder occur expecialy cold front across Japan lund which happen big thunder rain.