noun
weather warning
Official warning issued by a meteorological agency for severe weather such as heavy rain, storms, or snow.
気象警報が発表されたら、すぐに安全な場所へ避難してください。
When a weather warning is issued, please evacuate to a safe place immediately.
気象注意報 is a weather advisory, less urgent than 気象警報 which is a warning for more severe conditions.
Compound of 気象 (weather) and 警報 (warning, alarm).