The story
Uncertain. Possibly a blend of duststorm + tornado. Compare gustnado. Alternatively, perhaps a blend of dustdevil + tornado, or simply blend of dust + tornado.
Etymology from Wiktionary, CC BY-SA 4.0.
dustnado
Today it means: A type of short-lived, low-level rotating cloud, similar to a gustnado, but characterised by elevated amounts of atmospheric dust. Full definition →