Mean underStorm Level
Revision as of 00:48, 3 April 2017 by Alexander Webb (talk | contribs) (Standardising Azimuth to metric)
Mean underStorm Level, or MSL, is the altitude where the Understorm and the habitable zone of Azimuth's atmosphere meet. It is typically very narrow, sometimes no more than 10 metres, with terrific windshear often exceeding 100 kph. The level is taken as a datum from which all altitude is derived: heights above the boundary are expressed as Above Mean underStorm Level (eg. 1000 m AMSL); while below they are termed as Negative altitudes (eg. Neg 500 m). Where notation is not given, positive altitude is assumed.
