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Ireland will come close to seen the highest area of high pressure ever recorded in the next 24 hours

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What is Atmospheric pressure?

Atmospheric pressure is an important parameter in monitoring the climate system, as the local and large-scale atmospheric circulation patterns are driven by differences in air pressure. The direction of airflow, above the layer affected by the frictional drag of the surface, is almost parallel to the isobars – lines connecting points of equal pressure. Near the surface, friction causes winds to blow across the isobars from high towards low pressure at an angle which depends on surface roughness but is typically about 25 degrees. It follows that maps of mean atmospheric pressure give a general indication of the predominant wind-flow over the country.

Movement and development of pressure systems affecting the country very often cause much larger hour-to-hour changes in the atmospheric pressure than those resulting from diurnal variation. Pressure rises or falls of 10hPa or more in three hours occur when vigorous depressions pass close-by or over the country. On occasions, rises and falls of 20hPa or more in three hours have been recorded.

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In the next 24 hours Ireland will come close to seen one of the largest areas of high pressure it as seen in 60 years but current data shows it will fall short of beaten the recorded for the highest pressure ever recorded in Ireland which was recorded 28 January 1905, Valentia Island, Co.Kerry 1051.9 hPa.

The Lowest ever pressure recorded in Ireland was on 28 November 1838, Limerick 931.2 hPa.

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Monthly maximum figures for atmospheric pressure in Ireland

January - 28th January 1905

Valentia, Co. Kerry

1051.9

February - 7th February 1964

Kilkenny and Mullingar

1049.1hPa

March - 13th March 1900

Valentia, Co. Kerry

1047.1hPa

April 26th April 1948

Shannon Airport

1043.4hPa

May - 12th May 2012

Cork Airport

1042.4hPa

An alternate value on 12 May 2012 at Valentia observatory of 1043.0 hPa has also been reported.

June - 14th June 1959

Clones, Co Monaghan

1043.1hPa

July - 1st July 1933

Malin Head, Donegal

1037.9hPa

August - 17th August 1940

Valentia, Kerry

1036.0hPa

September 10th and 11th September 2009 and 24 September 2018

Malin Head (2009) Sherkin Island and Cork Airport (2018)

1041.3hPa

October - 22th October 2018

Sherkin Island 1043.8hPa

*Previously 31 October 1959 Malin Head 1043.0hPa

November 10 November 1999

Knock Airport, Mayo

1046.0hPa

December - 24th December 1926

Malin Head, Donegal

1049.5hPa

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