A dry September BUT not the driest

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A dry September BUT not the driest

Postby Richard_Griffith » 2014 Oct 01, 09:44

Many will be aware of the reports in the press regarding the dry conditions for September, at my site at Horsham in West Sussex I recorded 18.6mm - 29% of the LTA. Looking at my records from 1983, this September ranked 4th driest - with 2003 recording 11.8mm. Looking at British Rainfall records for the period 1953-2014, for my location this September ranked 8th driest with September 1959 recording only 2.0mm.

So it will be interesting to see how other parts of the country have done, yes it was a dry September but not the driest!

Regards
Richard Griffith
Horsham CDL AWS (Est 1982)
West Sussex
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Re: A dry September BUT not the driest

Postby Martin Rowley » 2014 Oct 01, 14:50

... Using the Hurn (provisional) figure of 22.2 mm for September 2014, you only have to go back to 2003 for a drier September [7.4 mm], which in fact was /the/ driest in their 1957+ series. There were 6 Septembers with lower PPN amounts [ 1959, 1971, 1978, 1979, 1997 & aforementioned 2003 ].

By the (provisional) EWP measure (ex Met O diagnostics site) = ~16 mm, this figure places September 2014 5th in that extended series, with 1959 the driest at 8 mm.

Martin.
Martin Rowley
West Moors, East Dorset [ altitude: 17 m/56' ]
NGR SU 082 023: postcode BH22 0GB
50deg49min15secN, 01deg53min03secW
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Re: A dry September BUT not the driest

Postby Nick Gardner » 2014 Oct 01, 18:30

I think this is a case of it being the driest September in some areas but it will be very localised.

I have been told by a few colleagues that live around Devon that they have not recorded any rainfall during this September.

I recorded only one day when rainfall occurred and that was on the 19th with 9.8 mm falling during a thunderstorm. Some areas nearby missed that storm so will likely to have recorded no rainfall at all for the whole month.
Near Newton Poppleford, Sidmouth - Devon
50:41N 3:17 W; 20 metres AMSL; Station Grade B-BAAA37
http://www.ottervalley.co.uk
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Re: A dry September BUT not the driest

Postby Graham Easterling » 2014 Oct 02, 15:37

6.8mm for September in Penzance, 8% of the 1981-2010 norm (89.0mm). September was the driest of any month since 3.0mm in May 1991.

During the period of my records (1991-2014) the previous driest September was 2001 with 27.6mm.
Graham

Penzance Weather Station
Grid Ref:
SW464231 - Post Code: TR18 4TP
19m AMSL - Aspect SSE
In a SE - NW orientated valley

23 Years of Penzance Weather Records : http://penzanceweather.atspace.com/weather.html
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Re: A dry September BUT not the driest

Postby Len Wood » 2014 Oct 02, 18:46

5.4 mm total for September here in Wembury.
The driest since 2002 when we had 4.9 mm.
Record began 1985.

Looking at the longer record of Plymouth which goes back to 1874,
here are past Septembers with below 10 mm rainfall:

1959 0 mm
2002 3.8 mm
1910 8 mm
1926 9 mm
Len

Wembury, SW Devon coast
N50.33 W4.13
Altitude 83 m asl
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Re: A dry September BUT not the driest

Postby John Oliver » 2014 Oct 03, 08:31

In Dorchester it was the driest September in local records back to 1896. The total from three raindays was 2.8mm (of which 2.2mm fell in the early hours of Oct 1st) beating the previous record of 3.3mm from one rainday, set in 1959.

Even earlier records from Bridport in the west of the county shows that no rain fell in the whole of September in 1865

John
Dorchester
south Dorset
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