1A storm or tempest — severe weather with strong wind and often rain.
昨夜、大きな嵐が来て、木が倒れた。
A big storm came last night and a tree was blown down.
嵐のため、船は港に避難した。
Because of the storm, the ship took refuge in the port.
天気予報は嵐に警戒するように呼びかけている。
The weather forecast is warning people to be cautious of the storm.
2A figurative use meaning uproar or hullabaloo; a storm of protest or turmoil.
その発言は世間に嵐を巻き起こした。
That remark caused a public uproar.
新しい政策は議会で嵐のような議論を呼んだ。
The new policy sparked stormy debate in parliament.
彼の失言は会社内に嵐を巻き起こした。
His gaffe caused an uproar within the company.
3In certain card games (oicho-kabu), a 'pile' of three cards of the same value (called 'arashi'); usually written in katakana as アラシ.
おいちょかぶでアラシが揃って大勝ちした。
I got an arashi in oicho-kabu and won big.