noun
alert level; warning level
Used in security, disaster, or threat contexts to indicate the degree of alert or warning. Often part of official scales or systems.
テロ警戒水準が引き上げられた。
The terrorism alert level was raised.
火山の警戒水準は現在レベル3です。
The volcano's warning level is currently Level 3.
警戒レベル is a more common and slightly less formal synonym, often used in everyday news. 警戒水準 is more formal and may appear in official documents or technical contexts.
Compound of 警戒 (alert, warning) and 水準 (level, standard). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.