On Nov 6, 3:24*pm, "Philip Eden" philipATweatherHYPHENukDOTcom
wrote:
"Nick" wrote :
So has this time of year become more cyclonic?
Circulation indices in the vicinity of the British Isles
for November since 1873 can be seen hehttp://www.climate-uk.com/indices/11.htm
Philip
Ought to be looking at autumn Sep,Oct,Nov.,in general.
Anyway, the indices are interesting Philip. There is no trend in Oct
or Nov. westerliness over the whole period, but very recently, i.e.
last decade, an upturn.
For Oct. there seems less anticylonicity since the peak in the late
70s. Nov. trend is less convincing over recent decades.
The autumn (Sep,Oct,Nov) rainfall totals for Pymouth 1874-2008 show no
trend.
Average 273 mm
Stand. dev. 85 mm
If a rather arbitrary value for extreme wetness when total400 mm is
looked for, this occurred in the following years:
1875 435
1929 471
1932 412
1935 439
1949 420
1960 492
1984 407
2000 467