Heavy downpour
(Other definitions for cloudburst that I've seen before include "dramatic downfall" , "Sudden rainstorm" , "Sudden, heavy downpour" , "sudden shower" , "storm" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavy downpour</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rainstorm that I've seen before include "Meteorological phenomenon" , "bad weather" , "power shower?" , "Wild weather" , "squall" .)