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Old 22nd Dec 2016, 23:19
  #4 (permalink)  
mikewil
 
Join Date: May 2010
Location: australia
Posts: 383
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'when mean direction changes by 30 degrees or more, the mean speed before or after the change being 20 kt or more'

'when the QNH altimeter setting changes by 2 hPa or more'

'when the temperature changes by 5 degrees C or more.'

Completely overlooked those possibilities, need go to back to AIP me thinks.


By the way, what does the 340V140 mean?
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