Summary Weather Statistics

[StratoQ]

This thread is to summarise this rainfall/flooding event in its entirety from personal weather stations to official Met.ie standards.

The month began on a very wet note for many with flooding from the word go on Nov 1st (carry over from the heavy rainfall during Oct 31st - see thread "Halloween Hell")

http://www.irelandsweather.com/forum/index.php/topic,597.0.html

Regarding weather stats to be added here, please include dates and times if applicable for any weather related statistic especially :

Monthly/Daily rainfall
High Rain Rate
No of rain days (with 0.2mm or more)
No wet days (with 1.0mm or more)
No days over 25mm
No days with thunder

Or indeed feel free to add any more you may think of (eg high winds, hail events, atmospheric pressure, sunshine, sunless days, temperature records etc.)

[Mothman]

Ashford Co. Wicklow Climate Station. 09-09h day, Sunshine 00-24hday
Rainfall since July 2001 (monthly totals since Nov 99)

This period was dominated by the number of days seeing more than 10mm
216.2mm made Nov 2009 the 2nd wettest month on record, but there was a fall of 34.9mm between 00-09h on Nov 1st that was attributed to 31st Oct, so taking 00-24h records, then it is the wettest month on record.
Nov 99
No of rain days (with 0.2mm or more) 25 2nd highest behind Nov 02
No wet days (with 1.0mm or more) 19 4th Highest behind Oct/Nov 02 & July 09

I keep running totals for various periods with ending date
7 day 90.7mm 19th Nov 4th highest on record behind Feb 09, Oct 02 & Dec 02
15 day 173.5mm 24th Nov Highest on record
21 day 207.4mm 2nd Dec Highest on record
28 day 247.8mm 7th Dec Highest on record
31 day 265.0mm 30th Nov Highest on record

Falls of 10mm or more
30th Oct 13.9m
31st Oct 34.9mm (all after midnight Nov 1st) 4th wettest Oct day on record.
9th Nov 12.0
11th Nov 13.6mm
12th Nov 12.3mm
13th Nov 23.2mm
15th Nov 21.0mm
18th Nov 15.6mm
19th Nov 20.3mm
21st NoV 13.4mm
22nd Nov 15.6mm
23rd Nov 11.0mm
28th Nov 12.6mm
29th Nov 16.2mm
1st Dec 13.4mm
4th Dec 14.5mm

Looking at AWS data for Nov 09, there were no exceptional short periods of rain.
Highest falls per period with ending time
5min 1.8mm        21st 10:10am
15min 3.3mm      12th 10:35am
30min 5.1mm      21st 10:30am
60min 8.4mm      22nd 16:10
3 hour 15.2mm   1st 08:00am
6 hour 27.6mm   1st 07:50am
12 hour 34.6mm 1st
24 hour 34.6mm 1st
While I don't keep running totals for above periods, the 6 and 12 hours falls are I feel notable

[Mothman]

18 page pdf article on Met Eireann site
http://www.met.ie/news/display.asp?ID=54.
I'd advise to save it because news items disappear once laters news items are uploaded.

November 2009 is notable for the high rainfall recorded and theconsequent severe flooding experienced in many parts of the country.Atlantic depressions passing close to Ireland brought wet and windyconditions throughout almost all of November, continuing a pattern ofvery unsettled weather over Ireland which began in the middle ofOctober. Rainfall totals for November were the highest on record atmost stations, including the long-term station at Valentia Observatory,where records extend back over 100 years. Valentia’s total of 360mm wasits highest of any month since observations began in the area in 1866.This report contains an analysis of approximately 440 rainfall stationsin the Met Éireann rainfall network.

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