April 2021 – Pressure and circulation
April 2021 was a very unusual month as far as pressure and North Atlantic circulation went with a massive +14 hPa anomaly to the …
Circulation
Winter 2020/21 – North Atlantic Oscillation
The daily North Atlantic Oscillation index for the winter of 2020/21 show a long spells of negative values from Christmas until mid February, and …
April 2021 – Sixth most anticyclonic since 1871
April 2021 may well have become the sixth most anticyclonic (60%) since 1871 using the Objective Lamb Weather Type series from the CRU, but …
Lamb circulation indices, sine waves and that missed named storm
This is an infographic of the climate indices drawn from the objective Lamb Weather type data for the last four months since the 16th …
Lamb circulation indices, sine waves and that missed named storm Read More »
Apr 1938 – An exceptionally dry and anticyclonic month
I was just scanning the objective Lamb Weather Type data for the most anticyclonic April in the data series that started in 1871, as …
Apr 1938 – An exceptionally dry and anticyclonic month Read More »
Azores high moves north for the spring
In the first two weeks of April the Azores has been rent in two by lower than average pressure at 40N 50W (-12 hPa) …
13 Apr 2021 – Temperatures “no great shakes”
As Ben Rich in his lunchtime BBC weather forecast says, in a strenuous effort to get around using the word cold, temperatures at 12 …
Repeat performance
This cold snap looks like the start of a recurring spell of northwesterly outbreaks forecast for the first half of April across IONA. The …
March 2021 – Mean pressure & anomalies
Mean sea level pressure was over 7 hPa higher than average to the southwest of IONA on March. This anomaly dominated the chart for …
Feb 2021 – Weekly circulation patterns
I have split February into weekly mean pressure charts to try and capture a better picture of the cold anticyclonic easterly nature of the …
All’s not lost – well not quite
The NWP of the last week have been united in showing how, after the current anticyclonic easterlies collapses later this week, they will be …
Jan 2021 – circulation
The reasons why northern Scotland saw its coldest January since 1985 are self evident when you look at the mean pressure charts for January. …
First hints of an easterly?
I may be clutching at straws as to what might come next this winter here, but there are the first signs of an easterly …
Mild air pushes into eastern Europe
Storm Christoph has made short work of the short cold spell that had become established across Scandinavia and eastern Europe since the New Year, …
Depressing outlook all bar Thursday
The weather looks depressingly like a very average kind of January for the next ten days or so, thats according to the ECMWF model, …
How to recreate a plotted weather chart from 1963 with observations from the Daily Weather Report
How to recreate plotted weather charts with observations from the Daily Weather Report – yes it’s rather a mouthful as titles go but it’s …
They thought it was all over…
The SSW event that occurred just after the New Year has been somewhat underwhelming in reinvigorating the Christmas cold spell across IONA, but there …
December 2020 – monthly mean pressure
Mean pressure anomalies for December across IONA were as much as 12 hPa below average. That combined with +10 hPa anomalies in the western …
2020 monthly circulation
Arguably the best weather in 2020 occurred during the very dry and sunny anticyclonic spell during April and May. The mild wet and windy …
Last 12 weeks circulation
In these weekly mean pressure charts it’s very easy to see the mild spell and strong southwesterlies that occurred in mid December followed by …
Winds veer into east as SSW gets underway
So it looks highly likely that an SSW event will get underway for the start of the New Year, the Met Office reaffirming today …
SSW imminent according to Met Office
Opposing forces battle for winter supremacy Posted by the Met Office Press Office on the 30th December, 2020 Courtesy of Met Office
Winds continue to veer in the coming week
The circulation over the next ten days across the UK will continue to become less cyclonic and more anticyclonic as winds gradually veer into …
Well and truly blocked into the New Year
The North Atlantic looks well and truly blocked well into the New Year according to the latest run of the ECMWF model, and eventually …