Answer: Simile
Step-by-step explanation:
A Simile is a figurative language form that compares things together for reference and in doing so uses the words, ''like'' or ''as''. For instance, ''he typed like a mad man'' or ''she looked like a queen''.
In the above, a simile in the form of ''like'' is used to compare the movement of the rainstorm to that of an avalanche.