Saturday, October 7, 2017

Weather Events In Great Britain and Ireland In the Years 500 to 750 (the Martin Rowley, booty.org.uk files)

Dorset's own Martin Rowley spent much time and effort looking at historical weather and compiling his results at:
 http://booty.org.uk/booty.weather/climate/
In 2014 a notice appeared on his site:

IMPORTANT! For various reasons, I shall no longer be able to maintain this web site - these files will not be updated / extended as of December 2014: the site itself should remain 'active' until spring 2017 [at least] - but, if there's anything you find of interest, please take a copy for off-line reference as it may disappear at some point in the future. This site will however have a permanent archive 'home' with the British Library HERE: enter 'Booty Meteorological' in the search box.

We made note of the change and thought the database was in good hands.
Maybe not.

The British Library link goes to "https://web.archive.org/web/20170114112646/http://www.webarchive.org.uk/" which may or may not lead you to "https://www.webarchive.org.uk/ukwa/target/286294101/source/subject" which in turn offers up a couple links to the Wayback Machine's:
https://www.webarchive.org.uk/wayback/archive/20130417044152/http://www.booty.org.uk/booty.weather/
It seems the Library may have misplaced the actual data pages.

A further keyword search exposed (!) the hazards of  a URL such as www.booty.org.uk/booty.weather/, returning, among other hits a Mexican meteorologist who appears to enjoy taking her clothes off.

Because the data is a unique compilation we are going to do what we can to get it back on the internet, this time hosted on Google's (Blogger) servers but it might take some time to find what pages went where.

In defence of the British Library, they have a lot of stuff to keep track of and probably have the pages on some dusty old server down in one of the sub-basement archives. The fact the Wayback machine didn't catch the individual pages is a bit more troubling.

It would be a real shame to have the pages disappear completely.

That said, here's the only page we had that was easily found on our servers but, as indicated above I believe we have more.
Somewhere.

http://booty.org.uk/booty.weather/climate/500_750.htm
main historical menu
<<<<100 BC - 499 AD
 DateTRS Description Ref:
 500 - 750
 ~ AD500 By this time, the storminess of the latter part of the 5th Century (q.v.) had 're-arranged' some coastal alignment in East Anglia. A sea-level rise noted, BUT, Lamb considers that this may have more to do with reporting of increased frequency of inland storm-driven surges, rather than a general world-wide sea level rise. Also note that evidence of significant rise in peat bog deposits by or around this time: therefore implies greater 'wetness' (and presumably cyclonicity). 1
 AD508 Possible severe winter. Rivers frozen for two months. Years also quoted as 507 or 509. 8,
LWH
 AD520 Major storm surge in Cardigan Bay. 1
 AD525 Possible severe winter. Thames frozen for 6 weeks. 8
 AD536 [or perhaps AD535]
(spring/March?)
 Volcanic eruption# (East Indies) at around 4degS is estimated to have put around 300Mt of aerosols into the stratosphere (c.f. Tambora in 1815 of 200Mt which led to the 'year without a summer' q.v.). This would have brought about an abrupt drop in world-wide temperature, and concomitant changes in atmospheric (& perhaps oceanic) circulation. It is thought that the effects (famine etc.) were experienced over the (then) known world, with a 'severe plague' in the years 541-544 possibly connected; up to 25% of the populations of Africa, Europe and Asia affected. A 'famine' / shortage of bread noted over Ireland in 538, and, if accepted as part of this phase, a severe winter in 554. [ some publications have the effects lasting until at least 555, and certainly tree-ring data suggest a period of reduced growth for western Europe up to at least 545. The implied NAOI would have been highly negative, with well-above average pressure over Greenland / Iceland sector, and lower values around the Azores. These events may be the origin of the 'Fimbul winter' of Norse legend.] (R.Met.S/'Weather' Feb. 2004 & "The Long Summer"/Fagan: see also: ..
http://en.wikipedia.org/wiki/Extreme_weather_events_of_535%E2%80%93536
** There is confusion with dating in some texts: 536 is mentioned a lot, but I fancy this is the year when the major world-wide effects were noted: Ice-core sampling suggests the actual year of the major eruption was 535.
## Alternative theories have been put forward for the world-wide effects noted: either a large comet hitting the earth, injecting huge amounts of debris into the atmosphere, or the Earth passing through a cloud of inter-stellar dust.
 R.Met.S, 20
 AD544/545
(Winter)
 Intensely cold winter (London / South) & possibly over a wider area (according to Easton, in CHMW/Lamb). 1, 8
 AD548
(perhaps 549)
 Possible severe gale/storm in London; many houses damaged and several people killed. 8,
LWH
 AD553/554
(Winter)
 Severe winter: Some confusion between 545 & 554, but Easton (in Lamb/1.) notes both winters as being notably cold / severe. Winter 'so severe' with frost & snow that 'the birds and wild animals became so tame as to allow themselves to be taken by hand'. (A Meteorological Chronology, quoted in "The Long Summer"/Fagan ref: 20) 1, 8, 20
 AD565/566
(Winter)
 A cold winter. (Easton, in CHMW/Lamb) 1
 AD566 [ date / season not given, but possibly linked to the cold winter noted above. ] Possible 'Great Storm' affecting eastern & mid-coasts of southern England - 'serious damage'.[ http://www.soton.ac.uk/~imw/chestorm.htm ] (See text)
 AD580 - 600 Indications of several, or a succession of wet years. Also, tree-lines by this time were falling & glaciers advancing. 1
 AD586 North Sea: floods & great storm. LWH
 AD589 Durham: storm flood - sea swept away villages, many drowned. LWH
 AD592:
(January - September)
  England: drought. Taken with the entry below, implies considerable blocking / extended periods of high pressure. LWH
 AD592/593
(Winter)
 A cold winter. (Easton, in CHMW/Lamb) 1
 AD604 Severe frost in England. Also noted as a 'severe winter' in Scotland, with 4 months frost. 8,
LWH
 AD605 Drought (possible). Also, 'great heat'. 8
 c.AD630 Thames flood in London. 8
 AD634
(Winter)
 Ulster, Ireland: snow - killed many.  LWH
 c. AD640'saround this time, some 'cold' years noted.1
 AD650
 AD679-681 According to legend, the drought (only certain for southern England) which ended in 681, and which was claimed to have lasted for three years, was broken on the day that Bishop Wilfrid converted the South Saxons to Christianity. (Actually, converting the King of the time, who would have then imposed the religion on his court and subsequently the people). Known as 'St. Wilfrid's drought'. 8,
LWH
 AD684 Ireland: Cold - lakes, rivers & sea froze. [ If this sort of weather was noted across Ireland, I would think that Britain would also have been affected: suggests anticyclonic / blocked, with an easterly type resulting. ]  LWH
 AD685 Coloured rain: often noted as 'Bloody Rain'. [ Coloured rain (or contaminated rain) is usually due to the atmosphere carrying very fine sand / dust, due to sand/dust-storms in arid areas, or volcanic dust [ due to major eruptions ] which may have an origin a considerable distance away from the place where the rain fell - often measured in thousands of miles / km. The sand / dust is washed out from the middle troposphere. Vesuvius and Etna are thought to have been very active in 685, and the 'bloody rain' which fell in this year probably contained volcanic dust. Whatever the source, it does suggest that the atmospheric conditions were such that tropical continental (Tc) airflow was involved, with a highly-blocked long-wave pattern in place. A mobile, westerly (or Atlantic) type doesn't allow the lengthy fetch at mid-levels of these contaminated winds. (Various years given, from 684 to 689) 8
 AD693 Ireland: Flooding due to heavy / prolonged rainfall - Leinster rivers flood for 3 days & nights.  LWH
 AD694/695
(but possibly 695/696)
(Winter)
 Severe winter. Thames frozen for six weeks - booths were built on the thick ice. 1, 8, LWH
 AD720
(or perhaps 721)
(Summer)
 Wales - very hot summer (& assumed to be dry). LWH
 AD737 Great drought .. London/South. 8
 AD738 Scotland: flood (assumed to be due to heavy / intense rainfall) - 400 families drowned in Glasgow. LWH
 AD741 Great drought .. London/South. 8
 AD748
(but could be anytime between
744 & 748)
(Winter)
 Ireland - Great snow destroyed herds. This would have been a major disaster. LWH
main historical menu
751 - 999>>>>