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
Expert witnesses in English law This has led to high profile miscarriages of justice where certain experts have expressed particularly strong opinions on matters without strong scientific consensus, or where they are considered to be the leading expert in their field. In such instances, it has been difficult for the court to initially refuse to admit experts, given their testimony is often necessary in the instant case. Given the probative value which tribunals may assign to expert witness evidence, their role has been restricted to instances where their expertise is unavoidably necessary. However, as fields of scientific knowledge continue to expand, and with the advent