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sebastiaan1973

Exciting News. Wetterzentrale Charts From 1871, 500 & 850 Hpa!

Exciting news for all lovers of historical weather analysis. Wetterzentrale has uploaded 500hpa and 850hpa charts from 1871 till now. So you can watch some very exciting event from the past in full colour.

http://www.wetterzen...n/fsreaeur.html

post-10577-0-14740300-1311956006_thumb.g

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Fantastic news as I have a lot of data and info from that period 1871-1900 and it has been frustrating at times to show charts from that period especially 1871-1880 :yahoo:

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Exciting news for all lovers of historical weather analysis. Wetterzentrale has uploaded 500hpa and 850hpa charts from 1871 till now. So you can watch some very exciting event from the past in full colour.

http://www.wetterzen...n/fsreaeur.html

Vey intresting and this day in 1871 looked very cool especially for the north

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good stuff thanks!

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interesting that July 1871 was given.

our very good local history society website shows reports of a couple of major flood events, one of which took place in July 1871.

according to the news item, floods reached a depth of 5ft 9inches with considerable damage to property.

it also mentions one in July 1881 which caused 3 deaths.

it would have been interesting to know what the rainfall totals were to give this sort of flooding.

if anyone is interested go to www.bacuptimes.co.uk and look at news items.

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Brilliant. And guess what, i just clicked on a random year and date from a winter and just by chance i got a stunning scandi high chart! i have no knowledge of great winters from that era at all, it was purely by chance.

Rrea00118950131.gif

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Exciting news indeed, quite a few dates I always wondered what the 850hPa temperatures were such as 1906 and 1919 in September for example:

20C isotherm touching Scotland on the 2nd in 1906:

http://www.wetterzentrale.de/pics/archive/ra/1906/Rrea00219060902.gif

-6C air over Northern England giving snow on the 20th in 1919:

http://www.wetterzentrale.de/pics/archive/ra/1919/Rrea00219190920.gif

Many more where that came from Im sure. Can anyone locate when the coldest and warmest 850hPa air hit the UK? Now thats a challenge!

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first charts i went to look at was the famous winter 0f 47!!!! I could never understand the other charts before the 1948 period.yahoo.gif

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http://www.wetterzen...00119470224.gif 1085 MB

Beat that!!!!

A gold mine of charts

S

Unbelievable. I always think of 63 and 47 when i ask myself the question 'What could be better than 87 or 91' but somehow i didnt think uppers or GH would necessarily come into the equation. I remember Micheal Fish in his weekly forecast last Nov saying 1065mb in Greenland was extremely rare but 1085!!!!! i have been watching SLP charts since the mid 80s but i have never even seen one come close to that.

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first charts i went to look at was the famous winter 0f 47!!!! I could never understand the other charts before the 1948 period.yahoo.gif

Yep me too, straight to it to watch the fascinating evolution from what started as a clasic West (strong PV) V East (strong block) battle only for the Atlantic to pile through. But not for long as following a classic retrogression, we then were plunged into deep cold for the remainder of the winter.

Certainly worth remembering to check back at charts like this when all seems lost as we head into January!!

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Wonderful. This'll keep me busy for a while.

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You have to be wary of pressure chart readings over Greenland ice shelf though and you can clearly see on that chart why you need to be sceptical. This has been commented on a number of times. I doubt it was high as that. As a matter of fact, if you look at the previous and after day charts, you will see a 1060mb high. No way it rose and drop 25mb in 48 hours.

Infact it wouldn't surprise me if it was not as high as this one which there is no doubt with a 1067mb over the Baltic.

http://www.wetterzentrale.de/pics/archive/ra/1907/Rrea00119070123.gif

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1881 looks like it had an exceptionally mild Xmas period!

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The 850hpa charts are based at research form reanalyses -> http://reanalyses.org/atmosphere/overview-current-reanalyses

http://onlinelibrary.wiley.com/doi/10.1002/qj.776/pdf -> article describing the research

The Twentieth Century Reanalysis (20CR) project is an international effort to produce a comprehensive global atmospheric circulation dataset spanning the twentieth century, assimilating only surface pressure reports and using observed monthly sea-surface temperature and sea-ice distributions as boundary conditions. It is chiefly motivated by a need to provide an observational dataset with quantified

uncertainties for validations of climate model simulations of the twentieth century on all time-scales,with emphasisonthe statistics of daily weather. It uses an Ensemble Kalman Filter data assimilation method with background ‘first guess’ fields supplied by an ensemble of forecasts from a global numerical weather prediction model. This directly yields a global analysis every 6 hours as the most likely state of the atmosphere, and also an uncertainty estimate of that analysis. The 20CR dataset provides the first estimates of global tropospheric variability, and of the dataset’s time-varying quality, from 1871 to the present at 6-hourly temporal and 2◦ spatial resolutions. Intercomparisons with independent radiosonde data indicate that the reanalyses are generally of high quality. The quality in the extratropical Northern Hemisphere throughout the century is similar to that of current three-day operational NWP forecasts. Intercomparisons over the second half-century of these surface-based reanalyses with other reanalyses that also make use of upper-air and satellite data are equally encouraging.

It is anticipated that the 20CR dataset will be a valuable resource to the climate research community for both model validations and diagnostic studies. Some surprising results are already evident. For instance, the long-term trends of indices representing the North Atlantic Oscillation, the tropical Pacific Walker Circulation, and the Pacific–North American pattern are weak or non-existent over the full period of record. The long-term trends of zonally averaged precipitation minus evaporation also differ in character from those in climate model simulations of the twentieth century.

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Brilliant! People have beaten me to September 1919 which was the first one I searched for :wallbash: but I'll just stick this one on here

Rrea00219381220.gif

Always wondered what the 850s were for that spell

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Exciting news indeed, quite a few dates I always wondered what the 850hPa temperatures were such as 1906 and 1919 in September for example:

20C isotherm touching Scotland on the 2nd in 1906:

http://www.wetterzentrale.de/pics/archive/ra/1906/Rrea00219060902.gif

-6C air over Northern England giving snow on the 20th in 1919:

http://www.wetterzentrale.de/pics/archive/ra/1919/Rrea00219190920.gif

Many more where that came from Im sure. Can anyone locate when the coldest and warmest 850hPa air hit the UK? Now thats a challenge!

Looks like 23C or so touched the south coast on 19 Aug 1932 (while northern Scotland was under 5C!)

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Yay! This should keep me occupied for a bit if I get bored :clap:

I've looked through some charts already and I notice there's quite a few easterlies with 850hpa temps of -15C or below from 1947 and before. The winter of 1895 looks cold especially February! I'm having a look at winters and keep landing on cold spells by chance

For example a Sub -15C pool of air at the end of Jan 1947 with a channel low coming in/developing and a SE'erly drift across the south.

This looks soo cold for N. Ireland if skies were clear with that ridge.. I'm surprised it didn't get lower than December 2010's record. http://www.wetterzentrale.de/pics/archive/ra/1947/Rrea00119470131.gif http://www.wetterzentrale.de/pics/archive/ra/1947/Rrea00219470131.gif

Also seen a couple +20C 850hpa air for example July 1947, after that winter.

I was wondering how this data was collected/mapped back then but I guess it is reconstructed/estimated.

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I must have somehow missed this thread as I only discovered this today- great stuff! The first charts I looked for were mostly the same ones as have been brought up in this thread, and included January/February 1895, January/February 1947, pre-Christmas 1938, the northerly of September of 1919.

The charts re. the winter of 1890/91 (a winter that I regularly referred back to during last winter) give a much clearer picture of what that winter was really like. It appears that the cold end of November 1890 was remarkably similar synoptically to what we had in November 2010, but then December 1890's synoptics are strongly consistent with a very dull dry month with a lot of "inversion cold" and not much snow, so I'd take a massive amount of persuading to even contemplate taking that month over December 2010. Of course, that winter also provided rather more interest later in the season, the mild sunny anticyclonic February and the exceptionally snowy March are shown up well.

I was also interested to see some of the past snow events during the cold Octobers of the late 1800s and early 1900s, e.g:

http://www.wetterzentrale.de/pics/archive/ra/1896/Rrea00118961011.gif

http://www.wetterzentrale.de/pics/archive/ra/1896/Rrea00218961011.gif

http://www.wetterzentrale.de/pics/archive/ra/1926/Rrea00119261023.gif

http://www.wetterzentrale.de/pics/archive/ra/1926/Rrea00219261023.gif

http://www.wetterzentrale.de/pics/archive/ra/1934/Rrea00119341031.gif

http://www.wetterzentrale.de/pics/archive/ra/1934/Rrea00219341031.gif

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December 1890 indeed looks unexciting for Britain, but look at that cold pool over Italy for a couple of days midmonth- 850s below -10 around Naples anyone?

Rrea00218901213.gif

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Rrea00118810120.gif

This January perhaps

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