Kirk here with "dust devil" news from Sunday. "Dust devils form when a pocket of hot air near the surface rises quickly through cooler air above it, forming an updraft." The difference between the hot air on Sunday (30 degrees!) and the cooler air above seems to be what caused this to occur in Kumamoto (you can see the Aso mountains in the background of the video). In Japanese it's called a つむじ風 (tsumuji kaze). Tsumuji is a "hair whorl" so tsumuji kaze is a "hair whorl wind" -- a much cuter term than "dust devil." :)
連休中に「つむじ風」が発生 竜巻とは違うメカニズムで原因は「暑さ」と「乾燥」? | 熊本のニュース|RKK熊本放送
連休中の熊本県内では、暑さの影響もあり「ある現象」が見られました。11月3日(金)「文化の日」の午後1時ごろ、大津町の畑で茶色い砂が高く巻き上げられている様子が見られました。青空が広がり、周辺に雲はない…