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Some autumn and winter gales do have the ability to produce very large drops in pressure, a good example for such a large drop would be the 24th November 2005 where the (sea level) pressure dropped from
1027.9 hpa/mbar at midnight at the 24th to 985.7 hPa at midnight the 25th.
So that would be a span of 42.2 hPa/mbar in a day which is pretty impressing for an extra-tropical storm.
This wasn't a particularly windy day with a maximum gust of just 47 km/h, in fact the windiest days here seem to correspond with not so large drops of about 10-20 hPa/mbar in 24 hours.
I suppose the British Isles and Norway can see even larger drops in pressure within one day given the very low cores in some storms.
In tropical storms the pressure could be even larger, maybe even much more than 50 hpa/mbar in a day if the core comes too close.
So what was the highest pressure span that you have ever seen in a day?
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