The international avalanche danger scale has only two coloured signs showing that natural and human triggered avalanches are unlikely (green colour)and likely (red colour).

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The international avalanche danger scale actually has five coloured signs showing different levels of avalanche danger: green (low), yellow (moderate), orange (considerable), red (high), and black (extreme). Each level indicates the likelihood and potential size of avalanches, as well as the potential for human triggering.

The International Avalanche Danger Scale Has Only Two Coloured Signs