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27-01-2019, 14:50   #1
Oneiric 3
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Rainfall & Drought Watch - 2019

Going through some stats, which I haven't updated in a good while, I was surprised to see how 'dry' this January has been so far across the country and proves that personal perception may not fall in line with the stats all of the time. As this January did not seem particularly dry to me, whereas December, which was statistically wet, did not seem to be all that so.


But, given that the odd rainfall patterns of last year seem to be continuing into this new year, I thought it might be useful to have a dedicated thread to exclusively monitor rainfall and drought patterns that may occur throughout the year, which continues on from the now irrelevant 'Summer Rainfall/Drought Watch' thread opened up last year.


To start it off, here is a graph showing the 28 day running rainfall pattern (expressed as percentages from the 1981-2010 average) for the last 12 months:




Very much swings and roundabouts since early Summer last year, yet overall, this winter so far, despite the unusually dry January, is running close to average regarding totals, due to the very wet December.

Will these wild swings in rainfall patterns continue throughout the coming year, or will they just fall back again within the usual standard deviations as we grow just that bit little older and just a little bit more portly as 2019 wears on?

We shall see...


All data in this post C/O Met Eireann.
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27-01-2019, 15:42   #2
blackwave
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Just out of curiousity and for my own knowledge is there any website to check the levels of the Irish Water resevoirs? If there isn't do people know how the levels are after the dry summer compared to other years?
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27-01-2019, 16:10   #3
prunudo
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Originally Posted by blackwave View Post
Just out of curiousity and for my own knowledge is there any website to check the levels of the Irish Water resevoirs? If there isn't do people know how the levels are after the dry summer compared to other years?
Roundwood has been about as full as it gets the last few weeks. Was full this time last year too. Can only base it from observations/looking back at old photos and not from technical data.
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02-02-2019, 12:51   #4
Oneiric 3
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Final national rainfall figure for January came in at 66.4mm, or around 60% of average, which is roughly on par with that of 2017, but still places it comfortably within the top 20 driest Januarys since 1900.

Some notably dry Januarys in history:

1963: 25.3mm
1997: 36.3mm
1953: 47.2mm
1935: 47.5mm
1964: 50.6mm.


Edit: May as well throw in MSLP stats as well for the month. Nationally, pressure anomaly came in at above 6.0 hPa above normal, with mean values highest in the SW (1020.4 hPa in both Cork Apt and Valentia) and lowest in the Northwest (1016.8 hPa in Malin Hd)

Last edited by Oneiric 3; 02-02-2019 at 13:53.
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02-02-2019, 13:50   #5
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Only 28.3mm here in Dublin 16 in January.
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02-02-2019, 16:15   #6
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I'm shocked anyone would be surprised at this news. We've had just one properly wet day since December 15 - Jan 31st.
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03-02-2019, 13:00   #7
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Just 18.4mm in January here in Arklow
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03-02-2019, 16:35   #8
Oneiric 3
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Just 18.4mm in January here in Arklow
May I ask how this compares to your monthly summer totals during 2018?

Looking at some temp stats here and nationally, averaged out over a 4 week period, the temperature anomaly peaked at 2.87 Deg. C during the mid-January period, which was higher than the peak 4 week deviation (2.74 Deg. C) which occurred during the extraordinary warmth of late Spring/early Summer last year, and with both times coinciding with unusually low rainfall totals.

Makes me wonder if the N Atlantic pattern was 'jarred' somewhat after the late Feb/early Mar easterly spell last year that we my still be in recovery from? As another very notable feature of this Winter so far is the lack of wind compared to average. It may have been an Atlantic dominated winter so far, but certainly not in typical way. Far from it in fact.

Any data used in this post is courtesy of Met Éireann.
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03-02-2019, 16:43   #9
Abhainn
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Began recording Feb 2013 in Wicklow Town
Last 6 Jans

2019 - 22.0mm
2018 - 97.1mm
2017 - 36.2mm
2016 - 111.3mm
2015 - 65.0mm
2014 - 145.3mm

Last edited by Abhainn; 04-02-2019 at 22:53.
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03-02-2019, 16:47   #10
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Off the top of my head,it's more rain than in June and July
November had a whopping in or about 300mm though and December around 150
I'm not near the pc but I'll look it up later
October was also wet
The southeast in general I think had a lot of rain in those 3 months
Using a Davis vantage pro 2
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03-02-2019, 17:17   #11
Oneiric 3
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Originally Posted by Mortelaro View Post
Off the top of my head,it's more rain than in June and July
November had a whopping in or about 300mm though and December around 150
I'm not near the pc but I'll look it up later
October was also wet
The southeast in general I think had a lot of rain in those 3 months
Using a Davis vantage pro 2
Thanks. November certainly was wet in the SE, but October looked to be quite dry, relatively speaking? At least according to this map by the Met.



Though those maps are not great at picking up localised quirks, which your region may well have experienced.
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03-02-2019, 19:18   #12
Mortelaro
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Yeah roughly 2 weeks of October was wet here,I'll have a look at the daily when I'm back at the pc
Many many days in November had anomalous dregs of coastal rain or showers dragging it's heels clearing
My area got a lot of that, as Villian will testify as he got the almost daily disaster report with video and radar to his carlow weather dm
Waterford weather actually had slightly more rain in nov and Dec than I did
Sometimes east wexford missed this as often the line of rain bumped out to sea there and back in near Waterford
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03-02-2019, 19:35   #13
Mortelaro
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Here's some examples from my Twitter from October

https://twitter.com/Arklowweather/st...787463680?s=19

https://twitter.com/Arklowweather/st...543418880?s=19

https://twitter.com/Arklowweather/st...443264515?s=19

https://twitter.com/Arklowweather/st...903442945?s=19
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03-02-2019, 20:30   #14
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We had 152mm of rain in Castlebar in January, but it is usually one of our wettest months with 16 out of the last 30 January's here having 200mm plus of rain.
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05-02-2019, 09:24   #15
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Quote:
Originally Posted by Abhainn View Post
Began recording Feb 2013 in Wicklow Town
Last 6 Jans

2019 - 22.0mm
2018 - 97.1mm
2017 - 36.2mm
2016 - 111.3mm
2015 - 65.0mm
2014 - 145.3mm
You don't have a live hourly/daily stream of this data anywhere online? I've been too lazy to get myown proper rain gauge yet ha.
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