High High Pressure 12th May 2012

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High High Pressure 12th May 2012

Postby Angus Tyner » 2012 May 12, 14:22

Very high pressure for May

SW Ireland 1043mb

Maxed out with me in eastern Ireland at 1041mb which is 8mb higher than I had previously recorded during May in my 13 year record.
The highest pressure I've recorded during the period April to Oct inclusive.

I've seen c1042mb mentioned as previous highest pressure recorded during May in Britain and Ireland.

Is there any truth in this?
Ashford Co. Wicklow
Met Eireann Climatological station number 975
COL station number EI018
My Weather Station
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Re: High High Pressure 12th May 2012

Postby Martin Rowley » 2012 May 12, 20:15

Angus Tyner wrote:Very high pressure for May

SW Ireland 1043mb

Maxed out with me in eastern Ireland at 1041mb which is 8mb higher than I had previously recorded during May in my 13 year record.
The highest pressure I've recorded during the period April to Oct inclusive.

I've seen c1042mb mentioned as previous highest pressure recorded during May in Britain and Ireland.

Is there any truth in this?


... quoting from the list in 'Weather' February 2007, in an article written by Stephen Burt:-

" Highest .... MSL pressures recorded in the British Isles ... nominally 1870 to date:

May Highest Value 1042.2 mbar Dublin Airport, 16 May 1943 "

Looking at today's MSLP reports from Block 03, specifically the Republic of Ireland, it looks as if the highest *hourly* recorded MSLP was 1043.0 mbar at Valentia (03953) closest land station to the anticyclone centre, which value was recorded at all hourly reports 0800 to 1100 GMT.

So, at face value, we've got a new May BI MSLP record.

16th May 1992 was the last time I have noted a pressure quite so high, when the figure got within a mbar of the previous (1943) record.

No doubt Stephen will come in at some time to expand on all this ...

Martin.
Martin Rowley
West Moors, East Dorset [ altitude: 17 m/56' ]
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Re: High High Pressure 12th May 2012

Postby Angus Tyner » 2012 May 12, 21:13

Thanks for that confirmation Martin.

Sherkin Is was also 1043.0mb at 0900, though I only see synops every 3 hours for this station.
Ashford Co. Wicklow
Met Eireann Climatological station number 975
COL station number EI018
My Weather Station
Angus Tyner
 
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Location: Ashford Co. Wicklow eastern Ireland 12m asl

Re: High High Pressure 12th May 2012

Postby Stephen Burt » 2012 May 13, 08:34

Confirmed - the Valentia 1043.0 mbar MSLP 0800-1100 UTC yesterday, 12 May, established a new British Isles May pressure record. This record extends back to around 1870.

The previous May record was 1042.2 mbar at Dublin Airport on 16 May 1943.

I can also confirm that the highest at Heathrow yesterday, 1038.5 mbar, recorded at the 11, 12 and 13z hourly obs, was also a new May record. The previous May highest there since records commenced in 1949 occurred on 16 May 1992. My highest on that day was 1037.5 mbar - I don't have Heathrow's value, but would expect it to be close to 1037.0 mbar.

SB
-----
Stratfield Mortimer, Berkshire - central southern England
51.4°N, 1.0°W, 60 m AMSL, station grade A - AAAA47R
Records commenced here 1987 - local records available back to 1862
The Weather Observer's Handbook: www.measuringtheweather.com
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Re: High High Pressure 12th May 2012

Postby Graham Easterling » 2012 May 13, 16:23

Reached 1041 mb in Penzance around noon on 12th, totally shattering my previous May Record.

A very sunny weekend, almost unbroken from 10am yesterday, and so far (17:10 on 13th) unbroken sunshine today, just a few small Cu inland.

Now drifting (OT)
Trouble is with such an anticyclone over the near Atlantic, the 1st day of 2012 when the sea's been truly inviting (12C SST, 15C air temp around at noon) the swell was roughly equal to what you'd expect on the Serpentine. Any hope of a 2 - 3' swell making it's way down from more northern latitudes sadly misplaced. Boards left in the car park or on top the beach. Hence sea empty, al fresco drinking popular. (Pics 10:20 BST approx)
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Graham

Penzance Weather Station
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SW464231 - Post Code: TR18 4TP
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Re: High High Pressure 12th May 2012

Postby Stephen Burt » 2012 May 13, 21:39

Graham Easterling wrote:... the 1st day of 2012 when the sea's been truly inviting (12C SST, 15C air temp around at noon) )


I think possibly that the Cornish definition of 'Inviting' must differ from the rest of the world's use of the word when a sea temperature of 12 °C is called 'inviting' ;-)

Or maybe it's just me!

SB
-----
Stratfield Mortimer, Berkshire - central southern England
51.4°N, 1.0°W, 60 m AMSL, station grade A - AAAA47R
Records commenced here 1987 - local records available back to 1862
The Weather Observer's Handbook: www.measuringtheweather.com
Stephen Burt
 
Posts: 247
Joined: 2011 Dec 02, 19:36
Location: Stratfield Mortimer, Berkshire; a well-exposed rural site, 10 km SW of Reading

Re: High High Pressure 12th May 2012

Postby brugge » 2012 May 14, 08:51

Chart attached.

Roger
Attachments
low-res Record British Isles May MSLP.jpg
0900Z MSLP 12 May 2012
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Re: High High Pressure 12th May 2012

Postby Richard Hunt » 2012 May 14, 18:19

The highest pressure for this station reached 1039.2 mb at 1252 UTC on May 12th. Beating my old record of 1032.5 mb recorded on 30th May 2009.
COL Station: 25020.

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