In another thread (which got sidetracked - hence this new one),
"Stephen Burt" wrote ...
Highest synop pressures I can find today [Thursday 10th] are (mbar):

1040.7 Malin Head 03980 15z - also 1040.5 14z, 18z
1040.5 Belmullet 03976 13, 14, 15z
1040.4 Connaught 03973 11z, 12z, 18z
1040.3 Claremorris 03970 11z

September British Isles records still stands - just - 1041.2 mbar at
Shawbury, Shropshire, 00 and 01 GMT 19 Sept 1986.


.... Stephen will no doubt come in when he can, but it looks as if the
September record was broken last night at Ballykelly (03908) at
11/0050Z ... however, it'll need to be 'buddy checked' and also
internally checked [i.e. to see if earlier readings were 'sensible'
within the overall pattern & within the station's own record:
Stephen's the expert on all this so I say no more :-) ]

[courtesy of OgiMet: look for the '4' groups for those that don't know
the code; thus in 03908, the group 40420 indicates a mslp of 1042.0;
the group immediately preceding it ('3' group) is the station level
pressure.]

[Ballykelly]
200909110050 AAXX 11014 03908 46960 /1604 10065 20062 30413 40420
53003 90050
333 8//99=
200909102350 AAXX 11004 03908 16960 /1105 10067 20063 30410 40417
57001 60001 92350
333 8//99=

.... and to check for other stations across the north of Ireland ...
[St. Angelo]
200909110155 AAXX 11024 03903 46658 /0000 10076 20069 40410 54000
90155
333 82/35=
200909110055 AAXX 11014 03903 46958 /0000 10082 20077 40410 52003
90055
333 80/99=
200909102355 AAXX 11004 03903 16956 /0000 10086 20079 40410 52003
60001 92355
333 80/99=
200909102255 AAXX 10234 03903 46960 /0000 10087 20080 40410 52005
92255
333 80/99=
[Castlederg]
200909110150 AAXX 11024 03904 47656 /2302 10067 20067 30348 40410
50001 710// 90150
333 84/32=
200909110050 AAXX 11014 03904 47958 /2702 10072 20072 30349 40411
53002 710// 90050
333 8//99=
[Malin Head .. midnight]
200909110000 AAXX 11001 03980 12484 32001 10100 20092 30382 40413
53002 69901 82202
333 82818 83075 92429 96122=
[Lough Fea]
200909110150 AAXX 11024 03911 46575 /3201 10080 20076 30130 40410
58001 90150
333 87/28=
200909110050 AAXX 11014 03911 46578 /2901 10076 20075 30132 40412
52002 90050
333 85/28=
[Ballypatrick Forest]
200909110150 AAXX 11024 03916 46363 /2102 10076 20076 30212 40408
58003 90150
333 553// 20000 81/06 83/74=
200909110050 AAXX 11014 03916 46364 /1801 10079 20079 30220 40415
53002 90050
333 553// 20000 83/06=
200909102350 AAXX 11004 03916 16362 /1902 10083 20083 30217 40412
53001 60001 92350
333 55/// 21292 82/09=

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

On Fri, 11 Sep 2009 11:37:52 +0100, Martin Rowley wrote in


... Stephen will no doubt come in when he can, but it looks as if the
September record was broken last night at Ballykelly (03908) at
11/0050Z ... however, it'll need to be 'buddy checked' and also
internally checked [i.e. to see if earlier readings were 'sensible'
within the overall pattern & within the station's own record:
Stephen's the expert on all this so I say no more :-) ]

Looking at recent obs it may well be the AWS at Ballykelly is slightly over
reading. Eglinton at 13.50z was 1038mb rounded, whilst Ballykelly was
still 1040mb at 13z. At 14z Ballykelly was 1039 and at 14.20 Eglinton was
1038. They are less than 10 miles apart.

--
Mike Tullett - Coleraine 55.13°N 6.69°W posted 9/11/2009 2:00:01 PM GMT

"Mike Tullett" wrote in message
...
On Fri, 11 Sep 2009 11:37:52 +0100, Martin Rowley wrote in


... Stephen will no doubt come in when he can, but it looks as if
the
September record was broken last night at Ballykelly (03908) at
11/0050Z ... however, it'll need to be 'buddy checked' and also
internally checked [i.e. to see if earlier readings were 'sensible'
within the overall pattern & within the station's own record:
Stephen's the expert on all this so I say no more :-) ]

Looking at recent obs it may well be the AWS at Ballykelly is
slightly over
reading. Eglinton at 13.50z was 1038mb rounded, whilst Ballykelly
was
still 1040mb at 13z. At 14z Ballykelly was 1039 and at 14.20
Eglinton was
1038. They are less than 10 miles apart.


.... thanks Mike. As you point out, looks a bit high. Perhaps the
'honour' will go across the border then (to Malin Head/1041.3 mbar at
00Z), but as I said, Stephen will even now be delving away with charts
and tables (or something fancier) and will no doubt come up with the
definitive answer :-)

Martin.


--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023

On Fri, 11 Sep 2009 15:35:06 +0100, Martin Rowley wrote in


Looking at recent obs it may well be the AWS at Ballykelly is
slightly over
reading. Eglinton at 13.50z was 1038mb rounded, whilst Ballykelly
was
still 1040mb at 13z. At 14z Ballykelly was 1039 and at 14.20
Eglinton was
1038. They are less than 10 miles apart.

... thanks Mike. As you point out, looks a bit high. Perhaps the
'honour' will go across the border then (to Malin Head/1041.3 mbar at
00Z), but as I said, Stephen will even now be delving away with charts
and tables (or something fancier) and will no doubt come up with the
definitive answer :-)

I wonder just how accurate the AWS system is and how often the sensors are
calibrated. Eglinton is an airfield still (City of Derry Aiport) so guess
pressure has to be accurate. Ballykelly, on the other hand, is the now a
disused army camp (Shackleton Barracks) where my wife used to "work":-) It
closed in the spring of 2008.

At least if the record does go to Malin we know the figure is as accurate
as can be, as it is still a manned station. Long may that continue, but
with the Irish economy being in ruins that may not last long - cue JCW:-)

--
Mike Tullett - Coleraine 55.13°N 6.69°W posted 9/11/2009 2:44:46 PM GMT

"Mike Tullett" wrote in message
...
On Fri, 11 Sep 2009 15:35:06 +0100, Martin Rowley wrote in

At least if the record does go to Malin we know the figure is as accurate
as can be, as it is still a manned station. Long may that continue, but
with the Irish economy being in ruins that may not last long - cue JCW:-)

The economy is in ruins? Never! It's just resting...on its laurels...!

Fair point though, Mike...anything could happen now in this country!

Joe

P.s. Good to see you posting more... :-)


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"Martin Rowley" wrote:
In another thread (which got sidetracked - hence this new one), "Stephen
Burt" wrote ...
Highest synop pressures I can find today [Thursday 10th] are (mbar):

1040.7 Malin Head 03980 15z - also 1040.5 14z, 18z
1040.5 Belmullet 03976 13, 14, 15z
1040.4 Connaught 03973 11z, 12z, 18z
1040.3 Claremorris 03970 11z

September British Isles records still stands - just - 1041.2 mbar at
Shawbury, Shropshire, 00 and 01 GMT 19 Sept 1986.


... Stephen will no doubt come in when he can, but it looks as if the
September record was broken last night at Ballykelly (03908) at 11/0050Z
... however, it'll need to be 'buddy checked' and also internally checked
[i.e. to see if earlier readings were 'sensible' within the overall
pattern & within the station's own record: Stephen's the expert on all
this so I say no more :-) ]

[courtesy of OgiMet: look for the '4' groups for those that don't know the
code; thus in 03908, the group 40420 indicates a mslp of 1042.0; the group
immediately preceding it ('3' group) is the station level pressure.]

There was a 1042.0 also at 00z at Tulloch Bridge (03047), though
that, too, looks a little high. Altitude correction is relatively large
there as well.

Philip

Many thanks, Martin, Mike and Philip for kicking off the thread and
for the posts above.

Including the comments/observations already noted, and a few of my own
from an hour delving through Ogimet’s excellent SDB, here’s where I
reckon we stand:
Observations at or above 1041 mbar (the existing Br Isles September
record is 1041.2 mbar back in 1986)

ACCEPTED
1041.3 03980 Malin Head 11/00z * New British Isles September record
MSLP *
1041.2 03162 Eskdalemuir 11/01z to 02z High altitude 242 m
1041.2 03911 Lough Fea (AWS) 11/01z Altitude 225 m, may be slightly
high
1041.2 03105 Islay, Port Ellen (AWS) 11/01z
1041.1 03155 Drumalbin (AWS) 11/01z Altitude 245 m, may be slightly
high
1041.1 03904 Castlederg 11/02z
1041.0 03903 St Angelo 10/23z to 11/02z

I have REJECTED the following observations for the reasons shown:
1042.0 03047 Tulloch Bridge (AWS) 11/00z - REJECTED
Agree with all above comments, looks a mite high, high altitude (237
m) MSL correction (around 23 mbar) the probable reason
1041.5 03916 Ballypatrick Forest (AWS) 11/01z - REJECTED
Agree with comments above, does look a shade too high with near
neighbours. Also high altitude correction (156 m) close to 15 mbar
1041.3 03225 Shap (AWS) 11/00z REJECTED
Looks high with near neighbours. Again AWS at high altitude (249 m)
with ~ 24 mbar correction

So the September monthly record (has been beaten – but by the
narrowest possible margin. It also looks as though the altitude
correction on high-level AWSs may be a little over-done at high
pressures.

If anyone knows of any additional observations above 1041 mbar that I
may have missed, or perhaps observations between reported synoptic
hours, I’d be grateful for the information.

I must also make a correction to my post of yesterday evening, where I
stated:
I am prepared to be corrected, but I'm 99% sure it's the earliest '1040' on record in the British Isles - the August record (the lowest of any month) is 1036.7 mbar, and we're only 10 days into September of course.

Slap my wrists for relying on my failing memory instead of checking my
events database properly. Philip pointed out to me, quite rightly,
that I’d omitted an even earlier ‘1040’ just five years ago - I quote
from Philip’s monthly summary for September 2004:

“High pressure lay over southern Britain from the start of the month,
extending to all parts of the UK from the 5th-9th and the barometer
climbed to 1040.6 mbar early on the 7th at Inverbervie,
Kincardineshire (a new UK record for the first half of September).”

Thanks Philip – you’re right, I had forgotten that one! Thanks for
setting the record straight.

--
Stephen Burt
Stratfield Mortimer, Berkshire

It will be interesting to see what the Met Office eventually come up with
too. Especially whether they reject or accept observations.

Will
--