In general, cloud height is measured from ground or AMSL (above mean sea level)?
If they measure from AMSL, how are low level clouds' height measured in higher terrain?
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Cloud ceiling is measured from ground:
height of the base of the lowest clouds ... that cover more than half of the sky ... relative to the ground
Cloud base is measured from sea level:
... the lowest altitude of the visible portion of the cloud. It is traditionally expressed either in m or feet above mean sea level