We don't have synonyms for arkstorm yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are barnstorm and alestorm.
(n) :
(meteorology) A very severe rainstorm lasting for many days, fed by an atmospheric river, causing massive flooding.
(n) :
Alternative form of arkstorm. [(meteorology) A very severe rainstorm lasting for many days, fed by an atmospheric river, causing massive flooding.]
(n) :
(meteorology) A very severe rainstorm lasting for many days, fed by an atmospheric river, causing massive flooding.
(n) :
Alternative form of arkstorm. [(meteorology) A very severe rainstorm lasting for many days, fed by an atmospheric river, causing massive flooding.]