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28-09-2018, 15:23   #766
sryanbruen
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Using the Maynooth University ICARUS Irish rainfall series (back to 1711), I have compiled the top 10 wettest months on record in Ireland and the top 10 driest months on record in Ireland of each month of the year, as shown below:





I have attached the data from ICARUS except this excel file is in monthly columns than each month every year being in a different row. I have also included the annual rainfall totals.

Data comes from ICARUS and Met Éireann.
Attached Files
File Type: xlsx Irish Rainfall Series by ICARUS.xlsx (112.6 KB, 7 views)

Last edited by sryanbruen; 28-09-2018 at 15:57.
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28-09-2018, 15:59   #767
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Now here's the top 10 wettest and driest seasons on record using the same series. I have edited the excel file attached above and added the seasonal data in it too.





Data again comes from ICARUS and Met Éireann.
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28-09-2018, 20:47   #768
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If we look at the extreme records page -

https://www.met.ie/climate/weather-extreme-records

It says the wettest April day was in Cloone Lake (Leitrim) and the wettest September day was also in Cloone Lake, but in Kerry. Is that a typo?
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29-09-2018, 09:00   #769
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Originally Posted by mickmackey1 View Post
If we look at the extreme records page -

https://www.met.ie/climate/weather-extreme-records

It says the wettest April day was in Cloone Lake (Leitrim) and the wettest September day was also in Cloone Lake, but in Kerry. Is that a typo?
It is likely to be a typo. Leitrim has two closed stations which had Cloone in its name, Cloone G.S. and Cloone (Aughnaglace House). I cannot check their data to see if they meant one of them for the Leitrim one as the historical database on met.ie is bugged right now.
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29-09-2018, 09:27   #770
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Interesting data series there Syran. Is this data available in more regional form or is just 'Ireland' specific?
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29-09-2018, 09:42   #771
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Just looking at that data series that Syran kindly shared and I note that the driest year occurred in 1788, with an annual total of just 697mm. Interestingly, this coincided with severe drought in France that same year, which played no small part in the epic uprisings that occurred there in the following year.


"In the summer of 1788, a year before the French Revolution, severe drought led to crop failure. Crop failure was followed by peasant uprisings that finally led to the abolishment of the French feudal system in the summer of 1789"

From: https://personal.lse.ac.uk/fleischh/...revolution.pdf
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29-09-2018, 14:17   #772
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Interesting data series there Syran. Is this data available in more regional form or is just 'Ireland' specific?
Not quite sure. I know that the series was part of the Data rescue initiative that students of ICARUS do. Some details on the series can be found in the attached paper.

I promised about two weeks ago I'd do the seasonal and annual sunshine total records for Dublin Airport (and Cork Airport) just like I did with the monthly ones. Here's Dublin Airport's ones.

I've been a bit experimental recently with the stats here, hope they've been enjoyable.

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30-09-2018, 16:37   #773
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November 1919 (99 years ago) recorded one of the most extraordinary cold spells in the history of the UK and Ireland. The fact the cold spell occurred in mid-November (not even the end of the month) says it all really. The November 1919 cold spell is my second favourite weather event to research or discuss about after November/December 2010 as I find it so fascinating how it could be as cold as it was then (Autumn 1919 in general was extremely intriguing, not November alone). Just goes to show how cold it can get in mid-November if the setup is there.

The pattern of November 1919 was similar to that of November 2010. There was blocking over Greenland with anomalous below average heights to the southeast of the UK driving winds in from the northeast with air coming from Scandinavia. The 500mb height anomaly reanalysis of November 1919 below shows this.



The first ten days of November were rather cold already with some overnight frost and light easterly winds at first, gradually becoming windier. The easterlies led to a lack of sunshine for many especially to the south of the UK and east of Ireland. These days were just damp, quiet and chilly.



The cold spell really took hold on the 11th (my birthday ) with northeasterlies dominating. There was plenty of snow showers. There was reports of thundersnow including for Blackpool in the northeast of England. A snowstorm occurred overnight into the 12th in Scotland as a secondary low passed within the severely cold air. Villages were cut off by the snow. There was a foot of snow (30cm) at Dartmoor, 17 inches (44cm) at Balmoral and 8 inches (20cm) at Edinburgh. At Balmoral, this snow continuously laid on the ground from the 8th to 30th November. The snow showers continued for a few days up to the 16th.



Light northeasterly winds and pressure rising led to bitterly cold temperatures being recorded. The snow cover acted as an excellent insulator in further dropping the temperatures to abnormally cold levels for mid-November (probably unprecedented) especially over Scotland. Braemar got down to a whopping -23.3c on November 14th! That is an exceptionally low temperature in the middle of Winter, never mind mid-November. This is the November record low temperature for the UK to the present day when writing this. November 14th 1919 is the earliest a minimum temperature of -20c (AND -15c!) has been recorded in the UK. This is such a phenomenal figure in many ways as you can see. On the same day, Perth got down to -21.7c. Balmoral recorded afternoon maximum temperatures of -10c on the 14th and -12c on the 15th. The temperature fell again to -22.8c on November 15th at Balmoral, the second earliest -15c/-20c temperature in the UK and the second lowest November temperature on record. The maximum at Carlisle, Cumbria in England on November 14th was only -2.7c whilst England's lowest minimum was -12.8c at Scaleby on the 16th. Lisburn in Northern Ireland recorded a minimum of -12.2c on November 15th, Northern Ireland's November record low to this day. 2010 got close at -11.9c on the 28th but not quite beating the 1919 record.



After the 17th, the weather turned more changeable with day to day variation of mild and cold. There were further instances of snow, sleet and hail from the 20th-23rd. Was the extraordinary cold going to become a distant memory or would Winter 1919-20 continue the cold? Winter 1919-20 was unsettled and mild so the November cold was to become the coldest weather of the whole season.



Lowest minimum temperatures of November 1919 for various Irish stations (via the UK Met Office monthly weather report).

StationCountyMinimum temperatureDate(s)
Markree CastleSligo-11.1*14th
Blacksod Pt.Mayo-1.714th/15th
MallaranyMayo-1.713th/15th/30th
DunfanaghyDonegal-3.914th
Malin HeadDonegal-1.114th/15th
LisburnAntrim-12.215th
DonaghadeeDown-1.717th
Armagh ObservatoryArmagh-8.315th
NewtownforbesLongford-8.315th
Dublin CityDublin-3.915th/30th
GlasnevinDublin-6.115th/16th/30th
Phoenix ParkDublin-9.415th
Trinity CollegeDublin-6.715th
RanelaghDublin-5.616th/30th
NewcastleWicklow-2.29th/16th
Birr CastleOffaly-9.414th/15th/16th
MountmellickLaois-6.714th
KilkennyKilkenny-8.912th
GortmoreWaterford-5.612th
Training CollegeWaterford-7.212th
Seskin, Carrick-on-SuirWaterford-4.411th/13th/15th
CahirTipperary-9.412th
FoynesLimerick-5.615th
Mungret CollegeLimerick-10.615th
KillarneyKerry-6.715th
Valentia ObservatoryKerry-4.412th
BallinacurraCork-6.712th
Roches PointCork-2.212th/13th

*The -11.1c temperature at Markree Castle on November 14th 1919 was the record low November minimum temperature for the Republic of Ireland until 2010 when it was beaten at -11.5c by Clonroche, Co. Wexford.

At a CET of 3.3c, November 1919 was the equal 7th coldest on record back to 1659. Just 4 years before, November 1915 was the second coldest on record with a CET of 2.8c (the coldest being 1782 at 2.3c). The coldest CET we've seen since 1970 was November 1985 at 4.1c in comparison. November 1915 was persistently cold and frosty whilst November 1919 had an extreme cold spell but was moderated later.







Data comes from the UK Met Office.
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30-09-2018, 21:48   #774
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Is there any data from the September 1965 snowfall which cancelled the Ploughing Championships in Enniskerry? All I can find is a northwesterly on the 9th which brought 0c uppers into the country but that's hardly enough for snow, especially with seas being at their warmest point in the year. I'm not even sure what date the championships were on at. It's hard to believe that it snowed. (could it somehow have been confused for very heavy hail that left accumulations?). Then again, Enniskerry is near 100m asl.
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30-09-2018, 23:57   #775
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Is there any data from the September 1965 snowfall which cancelled the Ploughing Championships in Enniskerry? All I can find is a northwesterly on the 9th which brought 0c uppers into the country but that's hardly enough for snow, especially with seas being at their warmest point in the year. I'm not even sure what date the championships were on at. It's hard to believe that it snowed. (could it somehow have been confused for very heavy hail that left accumulations?). Then again, Enniskerry is near 100m asl.
The National Ploughing in Enniskerry that was affected by snow was held in the month of January. It is only in the past 25 years or so was the competition has been held in the month of September. Back in the late 80s and early 90s it used to be early October. It was decided due to possible weather reasons to have in late September. In the last few years it is coming in towards mid September. Most county and regional matches take place over the winter months.
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01-10-2018, 00:44   #776
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Oneiric 3, you asked me in the Ali thread how many of the named storms since 2015 were "proper storms". I don't know what the criteria is for one but I thought I'd take the liberty into making tables like the one below. The one below is of the maximum wind gusts (in knots) for selected Irish stations for each named storm in 2015-16 with the exception of Storm Katie because Katie didn't really impact Ireland, she was over England. I will be doing the same thing with the other storm naming seasons we've had so far (2016-17 and 2017-18).



If you do not know the dates of occurrence of the named storms, well here's this illustration for you.



Data comes from Met Éireann.
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01-10-2018, 08:30   #777
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Thanks Syran. A 'storm' is when 10 minute mean speeds reach in excess of 48 Kts (89 Km/h). Relatively common along exposed western coasts I guess, but a very rare occurrence for the rest of us. Most of those storms you list typically brought mean speeds of between 20 and 30 knots to most of the country, which would, on the BF scale, be a F6 or F7 at best, which would not even be classed as a gale in the true sense of the word.
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01-10-2018, 08:43   #778
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Originally Posted by Jpmarn View Post
The National Ploughing in Enniskerry that was affected by snow was held in the month of January. It is only in the past 25 years or so was the competition has been held in the month of September. Back in the late 80s and early 90s it used to be early October. It was decided due to possible weather reasons to have in late September. In the last few years it is coming in towards mid September. Most county and regional matches take place over the winter months.
That makes sense. Media getting things wrong as usual, they were saying September.
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01-10-2018, 09:14   #779
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Now here's the maximum wind gusts (knots) for selected Irish stations for the named storms of 2016-17. Did not include Storm Angus as it did not impact Ireland. Again, you'll find the dates to each of the storms in the second image if you do not know them.



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01-10-2018, 13:16   #780
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Wonder how Halloween 2018 will fare in terms of temperatures. We've had some unusually warm Halloweens in recent years (including the record warm one in 2014). Here's the UK maximum temperatures for Halloween in previous years.



Data comes from the UK Met Office.
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