I understand from work that the NWS in the US were the main culprit for not
being able to absorb CORrection Metars. As a result, many other listings on
the internet failed to record the Heathrow Metar. Looking tonight it seems
that they may have fixed that problem as most of the obs are now available -
today at least!
Phil
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www.layton.me.uk/meteo.htm