It's easy to forget that the first 11 days of June were largely anti-
cyclonic, and the rains didn't really get going till the 12th or 13th.
However, both the anticyclonic and cyclonic parts of the month
had a marked easterly bias, and as a consequence it was the
most 'easterly' June in 135 years of record. It also ranked 16th
most cyclonic.

Mean pressure charts are now available at:
Charts: http://www.climate-uk.com/monpre/0706.htm
The Monthly Review has already been uploaded to:
http://www.climate-uk.com/monthly/0706.htm
Graphs: http://www.climate-uk.com/graphs/0706.htm and
http://www.climate-uk.com/graphs/200706.htm
Not The Long Range Forecast will be found after 3 July at:
http://www.climate-uk.com/page4.html

On the mean sea-level chart the Icelandic low is completely
absent; instead there is a broad trough extending across the
Atlantic and much of Europe between latitudes 50 and 60degN
with shallow centres of 1010mbar southwest of Ireland and
over southern Sweden. The Azores high (1021mbar) was
weaker than usual and displaced southwest of its normal
position. A large area of high pressure (two centres of 1019mbar)
covered the Norwegian Sea, Iceland and Greenland.
A marked E to NE flow covered the British Isles north of
latitude 52degN. The flow was SWly over southernmost
counties.

The sea-level pressure anomaly field showed a large negative
centre located SW of Britain with a marked trough extending
ENE across southern Britain, the North European Plain and
the southern Baltic, and a large positive centre near Iceland.

The main anomaly centres we
-9mbar at 48 degN 17 degW
+8mbar just north of Iceland

Over the British Isles pressure anomaly ranged from
+0.5mbar at Lerwick to -7.5mbar at Valentia. The anomalous
flow was strongly ENEly north of a line from the Bristol Channel
to Norfolk, and SWly over southernmost counties of England.

CET (after Manley) 15.43°C (+1.3 degC wrt 1971-2000)
the seventh consec June above the 71-00 mean.
CET (after Hadley) 15.2 or 15.3°C (+1.1 or 1.2 degC)
E&W Rain (provisional): 141.9mm (208% of 1971-2000 mean)
the wettest since 1860 and third wettest since 1766;
the May/June total of 263.2mm (203%) is a new record
E&W Sunshine (prov): 143.5 hr ( 76% of 1971-2000 mean)
the dullest since 1998

CScotT: 13.1°C (+0.6 degC)
ScotRain: 81.9mm (143%)
ScotSun: 137.9hr ( 78%)

NIT: 13.5°C (+0.7 degC)
NI Rain: 91.8mm (152%)
NI Sun: 167.9hr ( 92%)

Rainfall totals ranged from 283mm at Wilsden (West
Yorks) to 9mm at Baltasound (Shetland).

Percentages ranged from 484 at Emley Moor (W.Yorks)
to 14 and Baltasound.

Sunshine totals ranged from 239.7h [KZ sensor] at
Tiree (Inner Hebrides) to 64.4h [KZ] at Gogarbank
(Edinburgh). It was the dullest June on record at
Aberdeen, Edinburgh and Boulmer (Northumberland)
and Aberdeen airport's total of 79h contrasts with 88h
last December. I can't believe that's ever happened
before in the UK!

Percentages ranged from 121 at Tiree to 37 at
Gogarbank.

(c) Philip Eden

Philip

Was the reading at Newry in NI (28.6C) not valid ?

Many thanks
Paul


"Philip Eden" philipATweatherHYPHENukDOTcom wrote in message
...
It's easy to forget that the first 11 days of June were largely anti-
cyclonic, and the rains didn't really get going till the 12th or 13th.
However, both the anticyclonic and cyclonic parts of the month
had a marked easterly bias, and as a consequence it was the
most 'easterly' June in 135 years of record. It also ranked 16th
most cyclonic.

Mean pressure charts are now available at:
Charts: http://www.climate-uk.com/monpre/0706.htm
The Monthly Review has already been uploaded to:
http://www.climate-uk.com/monthly/0706.htm
Graphs: http://www.climate-uk.com/graphs/0706.htm and
http://www.climate-uk.com/graphs/200706.htm
Not The Long Range Forecast will be found after 3 July at:
http://www.climate-uk.com/page4.html

On the mean sea-level chart the Icelandic low is completely
absent; instead there is a broad trough extending across the
Atlantic and much of Europe between latitudes 50 and 60degN
with shallow centres of 1010mbar southwest of Ireland and
over southern Sweden. The Azores high (1021mbar) was
weaker than usual and displaced southwest of its normal
position. A large area of high pressure (two centres of 1019mbar)
covered the Norwegian Sea, Iceland and Greenland.
A marked E to NE flow covered the British Isles north of
latitude 52degN. The flow was SWly over southernmost
counties.

The sea-level pressure anomaly field showed a large negative
centre located SW of Britain with a marked trough extending
ENE across southern Britain, the North European Plain and
the southern Baltic, and a large positive centre near Iceland.

The main anomaly centres we
-9mbar at 48 degN 17 degW
+8mbar just north of Iceland

Over the British Isles pressure anomaly ranged from
+0.5mbar at Lerwick to -7.5mbar at Valentia. The anomalous
flow was strongly ENEly north of a line from the Bristol Channel
to Norfolk, and SWly over southernmost counties of England.

CET (after Manley) 15.43°C (+1.3 degC wrt 1971-2000)
the seventh consec June above the 71-00 mean.
CET (after Hadley) 15.2 or 15.3°C (+1.1 or 1.2 degC)
E&W Rain (provisional): 141.9mm (208% of 1971-2000 mean)
the wettest since 1860 and third wettest since 1766;
the May/June total of 263.2mm (203%) is a new record
E&W Sunshine (prov): 143.5 hr ( 76% of 1971-2000 mean)
the dullest since 1998

CScotT: 13.1°C (+0.6 degC)
ScotRain: 81.9mm (143%)
ScotSun: 137.9hr ( 78%)

NIT: 13.5°C (+0.7 degC)
NI Rain: 91.8mm (152%)
NI Sun: 167.9hr ( 92%)

Rainfall totals ranged from 283mm at Wilsden (West
Yorks) to 9mm at Baltasound (Shetland).

Percentages ranged from 484 at Emley Moor (W.Yorks)
to 14 and Baltasound.

Sunshine totals ranged from 239.7h [KZ sensor] at
Tiree (Inner Hebrides) to 64.4h [KZ] at Gogarbank
(Edinburgh). It was the dullest June on record at
Aberdeen, Edinburgh and Boulmer (Northumberland)
and Aberdeen airport's total of 79h contrasts with 88h
last December. I can't believe that's ever happened
before in the UK!

Percentages ranged from 121 at Tiree to 37 at
Gogarbank.

(c) Philip Eden

"PJB" wrote in message
...
Philip

Was the reading at Newry in NI (28.6C) not valid ?

Hi Paul .. I discounted it ... it was so far out of line with three adjacent
stations (Glenanne, Killowen, and Katesbridge) that it must have been
a glitch.

Philip

Philip, do you know what the lowest official rainfall figure was for
England. I have a chance of beating it!
Dave

"Dave Cornwell" wrote :

Philip, do you know what the lowest official rainfall figure was for
England. I have a chance of beating it!

Dave ... 57mm at St James's Park in London. If you are using
a rain-gauge which is not sited on the ground you should be aware
that you are probably losing a proportion of your rainfall, perhaps
up to 10%. I always recommend AWS users to have a manual
rain-gauge as well, at least for a year or two, so you can see the
relationship between the AWS's rainfall and the standard.

Philip

On 3 Jul, 08:53, "Philip Eden" philipATweatherHYPHENukDOTcom wrote:
"Dave Cornwell" wrote :

Philip, do you know what the lowest official rainfall figure was for
England. I have a chance of beating it!

Dave ... 57mm at St James's Park in London. If you are using
a rain-gauge which is not sited on the ground you should be aware
that you are probably losing a proportion of your rainfall, perhaps
up to 10%. I always recommend AWS users to have a manual
rain-gauge as well, at least for a year or two, so you can see the
relationship between the AWS's rainfall and the standard.

And dare I say there's also the question of calibration of the gauge
mechanism. Easy enough to do: many TBRs as shipped can be found to
under-read by 15-30% regardless of exposure, so worth checking.
There's also the fact that if it's a 1 mm tip you'll lose a lot more
through evaporation than a 0.2 mm capacity tipping-bucket gauge,
particualrly on days with small amounts which will often be lost
altogether.

My (calibrated) £25 wireless 1 mm unit reads typically 10-20% below my
standard checkgauge, my two 0.2 mm TBRs - admittedly much more
expensive units - are normally within 2%.

For instance, last month:

Standard checkgauge - 86.3 mm (= 100%)
TBR 0.2 mm tip - 87.7 mm (102%)
Wireless 1 mm unit - 78 mm (90%)

Stephen
Stratfield Mortimer, Berkshire

In uk.sci.weather on Tue, 3 Jul 2007, Philip Eden
wrote :
"Dave Cornwell" wrote :

Philip, do you know what the lowest official rainfall figure was for
England. I have a chance of beating it!

Dave ... 57mm at St James's Park in London. If you are using
a rain-gauge which is not sited on the ground you should be aware
that you are probably losing a proportion of your rainfall, perhaps
up to 10%. I always recommend AWS users to have a manual
rain-gauge as well, at least for a year or two, so you can see the
relationship between the AWS's rainfall and the standard.

Why *do* AWS's under-record, BTW?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

On 3 Jul, 17:43, Paul Hyett wrote:

Why *do* AWS's under-record, BTW?

TBRs rather than AWSs (although most AWSs use TBRs) - mostly due to
evaporation from the open bucket surface, some frictional losses,
tendency to stick in tipped position in very heavy rainfall.

Many of today's cheaper shiny plastic models also tend to lead to the
formation of drops in the funnel rather than allow the water to drain
into the tipping bucket mechanism, further increasing evaporative
losses. (A rub-down with fine emery paper will often solve that
problem.)

Those factors, together with poor calibration and often a poor
exposure, mean they are very much more likely to under-read than over-
read.

Stephen
Stratfield Mortimer, Berkshire

"Stephen Burt" wrote:
On 3 Jul, 17:43, Paul Hyett wrote:

Why *do* AWS's under-record, BTW?

TBRs rather than AWSs (although most AWSs use TBRs) - mostly due to
evaporation from the open bucket surface, some frictional losses,
tendency to stick in tipped position in very heavy rainfall.

Many of today's cheaper shiny plastic models also tend to lead to the
formation of drops in the funnel rather than allow the water to drain
into the tipping bucket mechanism, further increasing evaporative
losses. (A rub-down with fine emery paper will often solve that
problem.)

Those factors, together with poor calibration and often a poor
exposure, mean they are very much more likely to under-read than over-
read.

Poor exposure ... including being 1.5m off the ground, which many of
theme are.

Philip