Here is a plotted chart of the minimum overnight [18-06] temperature anomalies from this morning’s 0600 UTC SYNOP reports. An amazing contrast between the anticyclonic north and the windy south, with minimum anomalies ranging from as low as -11°C in the Highlands of Scotland, to +5°C along the coast of southeast England.
The relative warm temperatures across the pole are well illustrated in this anomaly chart for the week 4 November to 10 November 2016, as is the very cold Scandinavia and NE Russia. Unusually the temperatures across the central Atlantic are well above average despite the SST still being below average.
It’s no wonder that the Arctic sea ice is still tracking -19.5% below average for the 11th of November.
The Antarctic also shows some large positive anomalies in the interior and the Ross Sea for the first 10 days of November. Treat these contours with some caution because I’ve only just started to contour on a spherical projection and as you can see there are certain oddities on the edge of the globe!
I can’t understand why the BBC weather presenters can’t be bothered to use temperature anomaly charts like the one below. I admit it would have been even better if I had contoured the results and colour fill them, but alas that’s beyond me at present. The beauty of an anomaly chart is that they are simple to understand and in a situation like today’s easy to visualise. Perhaps it will all change when Meteo Group take over the contract, one can but hope, because I’ve heard so many explanations about how cold it feels in the last week. Carol Kirkwood this morning for example said that although today would be colder that tomorrow, because there would be more wind tomorrow, tomorrow would feel much colder than today even though it would be warmer. I know all about wind chill, but the public must be pretty bewildered when they hear that, and are then presented with a chart of minimum temperature in towns and cities and then another one of rural temperatures. Why not simplify matters and just report the extreme minimum temperature in the region like they did in the good old days of magnetic numbers? They don’t seem to mind doing that with extreme maximum temperatures all through summer, so why not for extreme minimum? You’ve probably heard me going on about this in previous years, and it usually starts in early autumn so I apologise!
Having said that the Indian summer continues in Northwest Scotland and here in the Southwest of England with another gorgeous day, and at the moment the temperature in mid-Devon is 16.6°C. But even if it’s a little on the cold side at the moment it isn’t quite a cold as it was on the 10th of October 2013.
And these are the 1200 UTC anomalies anomalies for that day.
The 13th of September 2016 apart from being our wedding anniversary, was quite an exceptional day temperature wise across a lot of western Europe and eastern England. I always apply my own home grown rules when looking at maximum temperature anomalies.
- -1 to +1 Near average
- +1 to +4 Warm (or mild depending on the season)
- +4 to +8 Very Warm (or exceptionally mild)
- +8 – +12 Hot
- >+12 Very Hot
The 13th was hot in a large area from the southeast way up to the northeast of England. There were some coastal exceptions but generally inland anomalies were above +10°C and in the top five SYNOP stations maximum anomalies exceeded +12°C.
Here is the ranked list of hottest places. The highest 34.4°C occurred at Gravesend and made it the warmest September day since the infamous 35.6°C at Bawtry in 1906, there is some talk regarding its validity, but I’ll have a more detailed look at the observations from their in another article. I remember Bawtry well because it was there I had my initial interview with the Met Office in June 1970.
Meanwhile in the more western parts thundery showers were tacking south north producing some severe thunderstorms and heavy rain, but more about that in another article – so much to do and so little time.
I must admit that I never realised just how warm it had been over central Russia in August, a monthly anomaly of +8°C is something quite special. Other than that their were negative temperature anomalies over the Balkans (-2), Scandinavia (-1), North Africa (-1) and of course the central Atlantic(-1).
It’s the first time in a long time that surface temperature anomalies seem to be back to normal in the Barents sea region of the Arctic. The chart below is for temperatures and anomalies since the start of the year at 80N 40E, which is right in the middle of the Barents Sea between Svalbard and Franz Josef Land. The anomaly values of +20°C or more for much of the Winter look like something out of the film “The day after tomorrow” I know (but in reverse – sudden warming and not sudden cooling), but as far as I can see my application is doing its job and they are correct, and as I said temperatures there seem to have returned to normal since the end of April.
Elsewhere warm air dominated, particularly over central Russia (+8), the bulk of North America (+4) and large parts of Europe (+2), but the western North Atlantic ocean is still slightly on the cold side (-1). I’ve added labels for the various extremes to help you read the contours, which are more than a little convoluted this month. Below is a chart of air temperature anomalies since the start of the year have in the mid-Atlantic, at 50N 25W to be precise. As you can see it’s been predominantly cold throughout, with some short warmer weeks.
And because the gridded data is also six hourly, I can look back at spot values for any particular hour or day, here is the 1800 UTC on the 30th of June showing how quickly things can change in the very short-term.