Synop decoding question?

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Keith (Southend)

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May 11, 2022, 5:05:21 PMMay 11
to Weather and Climate
What does the 3rd but last number series report? 91008 in this case. The next are the maximum hourly wind gust (knots)

AAXX 11204 03693 25783 82505 10139 20127 30112 40114 53032 88/// 333 55303 60005 88/50 91008 90710 91113==

Many thanks

Keith (Southend)


Freddie

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May 12, 2022, 2:34:51 AMMay 12
to Weather and Climate
It's the maximum gust in the 10 minutes up to and including the observation time.  So, in this case, the observation is nominally for 20:00 UTC on the 11th, so the actual time of the observation was 19:50 UTC.  Therefore the period of the maximum gust in the 910 period in this case is 19:40-19:50.  It's the same gust you would see in a METAR - the one after the "G" is, for example, 25015G25KT.

Keith (Southend)

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May 12, 2022, 6:21:34 AMMay 12
to Weather and Climate
Thanks for that Freddie.

Strange one that.

Keith (Southend)

Freddie

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May 12, 2022, 11:09:36 AMMay 12
to Weather and Climate
It has been in  the SYNOP code for at least 30 years, so it's nothing new :)
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