The one stand out factor in the MSLP anomaly chart for July 2019 was the much higher than average pressure across central Greenland
The word ‘unusual’ seems to be cropping up in every weather forecast on the TV when describing low ‘Yap’ at the moment, but how unusual are deep lows in August?
The heatwave over parts of France may have caught all the headlines but the centre of the warmth in June lay much further east in Poland and Ukraine.
June 2019 was the fifth most cyclonic since 1871
Told you it was cold!
Just how unusual was the intensity of the D-Day low over the British Isles?
The coldest June in the central England series was that of 1675 but what about June of 1972 which lies joint second coldest?
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.
Anomaly charts for a period of a month like these for mean temperature and MSLP don’t always give a true indication of how either have been during a month as was the case in May 2019.
The valuable chart archives on the Wetterzentrale site provides a number of reanalysis series, from CFSR, ERA and NOAA that you can download daily charts from. The CFSR series is at 0.5° resolution, whilst data from ERA is 1° and NOAA 2° resolution. Here’s an example of all the daily charts (00 UTC) for last winter [DJF 2018-19] using CFSR reanalysis data of MSLP and geopotential height at 500 hPa. Trying to find the start and end of any cold or warm spell in a series of weather charts by quantifying just how cold or warm it’s been in any...
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 this on the combined frequency of the daily anticyclonic or hybrid anticyclonic LWT. May 1896 scores an extremely high 74% anticyclonic for the whole month, which is way ahead of the next year in the list, 1871 with 63%. My findings are backed up by the weather charts for the month based on the American reanalysis data. This May is already off to a...