hundred-year storm

Noun

A storm of such force that it occurs only once every one hundred years approximately.

Japanese Meaning

百年に一度しか起こらないほどの非常に激しい嵐 / 非常にまれで猛烈な威力を持つ嵐

The town's old levees were overwhelmed by a hundred-year storm that came without warning.

その町の古い堤防は、予告なしに襲った100年に一度の嵐に圧倒されました。

Sense（1）

A storm of such force that it occurs only once every one hundred years approximately.

hundred-year storms

（ plural ）