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Thread: QNH in a TAF
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Old 15th Feb 2012, 03:49
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OZBUSDRIVER
 
Join Date: Dec 2001
Location: YMML
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Nice thread TAF Questions circa2008

And we find ourselves at the beginning of time...but now with interpolation

There is a nice little post from ITCZ and a responce from a METO at post28

to qoute-
ITCZ

Thank you for the information you have supplied.

The TAF QNH forecasts are point forecasts for the indicated times, e.g. 00, 03, 06, 09. However, a point forecast is valid for 90 minutes each side of the time point; and pilots should not interpolate. Unfortunately, the rule doesn't work for a half way point, e.g. 0430, in which case you have to choose one of the two point forecasts.

We will reword GEN 12.16.3 to make this clear.

Regards

Peter

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