Colour state other than clouds or low visibility (e.g. ice or other obstructions) then the word BLACK is written in full and placed immediately before the actual colour state (e.g. BLACKWHT). The colour state may be appended to a METAR report. A short period forecast called a "TREND" which covers the following two hours from the observation may also be added, often with reference to the colour state. The following criteria are used to determine the colour state: Colour state Colour states is a system used for quickly showing meteorological conditions. Meteorological colour states are determined by the relevant worst condition from
Etiquette in Europe region. For example, addressing a person with an honorific or title may be expected in some languages, but seen as intrusive or too formal in others. In many parts of Europe, using someone's first name also denotes a certain level of friendship. In social interactions with strangers, the last name and/or more formal mode of address is used, usually until the people involved agree to move to an informal level. However, this may not apply among young people, among members of particular groups (e.g. students) or in informal settings. Also among countries that border each other vast differences can be