Recent circulation indices
An abrupt start to autumn 2020 is evident in these six charts of various objective LWT circulation indices since the 7th of July 2020. Mean pressure has been falling away since the second week in September, …
LWT
Equinoctial gales: fact or fiction?
Equinoctial galesThe implication contained in this term, which is in fairly wide popular use, that GALES are either more frequent or more severe near the EQUINOXES than at other times, is not supported by observations. In …
Sixth most cyclonic June since 1871
I hadn’t realise until I ran the analysis on the objective LWT data from the CRU just how cyclonic June 2020 had been. It’s the joint sixth most cyclonic June in LWT circulation types since 1871, …
Hints of an easterly by mid month
The latest ECMWF hires model is hinting at a easterly circulation by mid June across the UK, with high pressure predominating over the Norwegian Sea, and low pressure just to the west of Iberia. In terms …
High Keywan set for a long stay
It looks like high Keywan, as the BIM have named it, will stick around in the central Atlantic right out till day ten if this ECMWF hi-res forecast proves correct. It’s forecast to be as intense …
Named storms and the Gale Index
This has to have been been the windiest autumn/winters of the last four across the IONA. There have been fived named storms up until going to press, three of them in February alone when it was …
Stormy winter
This winter so far has a Gale Index of 30.3, the third highest of any winter since 1871, and not too far behind the memorable stormy winter of 2013-14.
1912 the most cyclonic June
This June has already started on a very cyclonic note, and interestingly there are already five June’s from this century already in the top twelve, with June 2012 ranked as second highest.
May 1896 most anticyclonic
Looking at the Jenkinson Lamb objective weather data from the CRU at the UEA, I find that May 1896 was the most anticyclonic across the British isles in the record that started in 1871. I’ve gauged …