<a href="https://en.wikipedia.org/wiki/Atmospheric_pressure" class="extiw" title="en:Atmospheric pressure">Atmospheric pressure</a> during the <a href="https://en.wikipedia.org/wiki/Great_Storm_of_1987" class="extiw" title="en:Great Storm of 1987">Storm of October 1987</a> recorded on a <a href="https://en.wikipedia.org/wiki/Barograph" class="extiw" title="en:Barograph">barograph</a> with a pivoted arm at the BP Research Laboratories, Sunbury, Surrey. The image shows that the minimum pressure at 03:00 on 16 October 1987 was 72.1 cm Hg (961 mbar). The very steep rise in pressure that followed the minimum is indicative of very high winds.
<a href="//commons.wikimedia.org/wiki/User:Martinvl" title="User:Martinvl">Martinvl</a>
<span class="int-own-work" lang="en">Own work</span>