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
Colour revolution against the political West. Many have cited the influence of the series of revolutions which occurred in Central and Eastern Europe in the late 1980s and early 1990s, particularly the Velvet Revolution in Czechoslovakia in 1989. A peaceful demonstration by students (mostly from Charles University) was attacked by the police – and in time contributed to the collapse of the communist regime in Czechoslovakia. Yet the roots of the pacifist floral imagery may go even further back to the non-violent Carnation Revolution of Portugal in April 1974, which is associated with the colour carnation because carnations were worn, and the