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
Political colour colour of their political party. Blue is usually associated with centre-right or conservative parties, originating from its use by the Tory party (the predecessor of the Conservative Party) in the United Kingdom. Green is the colour for both environmentalist and Islamic political parties and movements (see green in Islam). Orange is the traditional colour of the Christian democratic political ideology and most Christian democratic political parties, which are based on Catholic social teaching and/or neo-Calvinist theology. Christian democratic political parties came to prominence in Europe and the Americas after World War II. Orange since 1989 has represented Post-Communist Democratic Revolutions