Summer 2021 General Discussion
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It's happened twice already this summer, the charts look very grim and then about 5 days into the grimness everything suddenly improves. The 'grim' charts in the middle of June only resulted in 3 cool days and then it was back to decent weather. The 'grim' weather in the first week of July really only lasted a week and even that had a few nice days thrown in and temperatures were reasonably warm.
I think this upcoming cool and unsettled spell may perhaps last at least a week to 10 days and hopefully big improvements will show across the charts and models by this time next week.
Ireland one of the warmest places in Europe today away from the Mediterranean. Not often you see this outside of winter.
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Beautiful day so far in Arklow, we are in an oasis of sun
Cloud to the west north and east but blazing Sun
Currently 20c
Must say I've loved this last week here,just lovely warmth with none of the extreme heat inland
One or 2 days above 24c
All mostly 22 to 24 Dawn to dusk
Here's my current view on the farm looking East
The sea is beyond the hill in front about 2kms away
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Now that the heatwave is officially over for all stations with no chance of anywhere reaching 25C or more today, time to analyse the statistics of it.
First off, here is the daily maxima table of all synoptic stations and Durrow/Kilkenny climate stations from 16-25 July. A total of 6 of the selected 27 stations kept heatwave conditions throughout (achieving at least 25C each day) for the 10 consecutive days - these being Athenry, Ballyhaise, Claremorris, Moore Park, Mount Dillon and Shannon Airport. Some stations like Durrow and Kilkenny fell short on 24th July so they had 8 consecutive days instead.
Secondly, here is a table of all the past heatwaves I have analysed (one station per heatwave based on which station had the longest duration and the highest mean max) with all the 2021 station heatwaves included too. As mentioned, the July 2021 heatwave lasted for 10 days for those stations which maintained heatwave status throughout the period. This was not as long as the late June/early July 2018 heatwave which lasted up to 18 consecutive days at Kilkenny and was the longest on available record. However, the fact it lasted 10 consecutive days makes it the longest 'mid-summer' heatwave since 1995 which might be hard for some to believe and frankly, I find it a bit mad myself.
Here's the above table condensed to only include all the past July heatwaves including 1976 and 2018 even though they began in June. If we don't include those two which began in June, July 2021 was the longest July heatwave on available record with the previous record of 9 consecutive days held by July 1934, July 1983, July 1989 and July 2013.
The July 1989 and 2013 heatwaves, particularly the 2013 one which tends to be remembered more, were longer in most people's minds I'm sure than this July's one. However, both were broken up by a few days of cooler conditions mid-month like in the case of 2013, the heatwave for most stations lasted from 8-12 July (5 consecutive days) with some lasting 6-13 July and in the case of Cashel in the table below, 6-14 July. The Azores High ridge weakened by the 13-14 July with cloud and cooler air filtering in from the northwest bringing an end to the statistical heatwave. However, we had seen a reinvigoration of the ridge by the 17 July with very warm or hot conditions returning but heatwave conditions (5 consecutive days of 25C or more) were not met and this would end already by 21/22 July.
31.2C at Durrow on 22 July was Ireland's highest July temperature since 2006 and third highest since 1983 to my knowledge.
Other things to remember from this heatwave which have already been noted but I'll summarise as a reminder to keep all in one post:
- The 7-day period 16-22 July was the sunniest July 7-day period on record for Dublin Airport and sunniest for any 7-day period since late June/early July 2018.
- Gurteen reached its peak of 29C at 8 p.m. on 19 July, very late for a temperature that high in Ireland.
- Valentia Observatory recorded 2 consecutive tropical nights on 22 and 23 July. The first time tropical nights have been recorded consecutively in Ireland as well as at an synoptic station and first since August 2001 anywhere in the country.
Photography site - https://www.sryanbruenphoto.com/
Weather photo portfolio - https://sryanbruen.myportfolio.com/weather-1
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