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Old 22nd Dec 2016, 23:10
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Dukeunlimited
 
Join Date: Apr 2008
Location: Australia
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There are a few possible options:

'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.'

I hope that helps.
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