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