If you fail to notice it through the news, and other official channels, then there's usually a very loud siren that's hard to ignore telling you there's a major

If you fail to notice it through the news, and other official channels, then there's usually a very loud siren that's hard to ignore telling you there's a major danger near you in most countries. If I had to guess in a case of an official declaration of war those would be activated all over the country for at least a day (probably more)