Then 2 such events in one month?
If jetstream immediately to the south of a low that deepens by =24mb in
24 hours sufficiently defined such an event.
Local weather station to me, Southampton Docks
www.sotonmet.co.uk/
archives bit on there for 27/28 March shows a minimum of 967.0mB ,
dropped 26.8mB in 24 hours (may be GMT/BST confusion )