それはすごい嵐だった。

that (indicating an item or person near the listener, the action of the listener, or something on their mind); it; that time; then; there (indicating a place near the listener); you

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

terrible; dreadful; amazing (e.g. of strength); great (e.g. of skills); wonderful; terrific; to a great extent; vast (in numbers)

storm; tempest; difficulty; trouble

be; is; indicates past or completed action; indicates light imperative