Coomhola Flood Monitor

Flood Alert Status

OVERALL STATUS

NORMAL

Rainfall: NORMAL

Antecedent: 43mm in 7 days (Moist (10% reduction))

Water Level: NORMAL

4.5m clearance - Normal levels

Bridge Clearance 98%

4.5m

Last 12 hours

Weather Station

18.6°C

Temp

70%

Humidity

1030

Falling

2 m/s

Wind

0 mm
Rain/Hour

0 mm
Rain Today

Met Eireann Forecast

Temperature15.5°C

Rain (6h)0mm

Rain (12h)0mm

Rain (6 day)4mm

Dry conditions

Yr.no Forecast

Temperature15.3°C

Rain (6h)0mm

Rain (12h)0mm

Rain (6 day)7mm

Dry conditions

Open-Meteo Forecast

Temperature16.2°C

Rain (6h)0mm

Rain (12h)0mm

Rain (6 day)16mm

Dry conditions

6-Hour Rain Forecast — Consensus

17:00

0.0mm

18:00

0.0mm

19:00

0.0mm

20:00

0.0mm

21:00

0.0mm

22:00

0.0mm

6h total: 0.0mm

6-Day Rainfall Outlook — Consensus

Sat

0mm

Sun

1mm

Mon

3mm

Tue

1mm

Wed

0mm

Thu

4mm

6-Day Total: 16mm

Context: The October 2025 Coomhola flood (~166mm over 3 days) would rank #2 in 82 years of records.

Overview▼

Data Period

Jan 1941 - Sep 2022

Total Days

29,734

Total Rainfall

157,976mm

Annual Average

1,927mm

Daily Average

5.31mm

Rain Days

64.7%

Threshold Frequency Table▼

Threshold	Days	%	Frequency
≥100mm	4	0.013%	~1 per 20 years
≥90mm	9	0.03%	~1 per 9 years
≥80mm	17	0.06%	~1 per 5 years
≥70mm	33	0.11%	~1 per 2.5 years
≥60mm	62	0.21%	~1 per year
≥50mm	149	0.50%	~2 days/year

Top 10 Severe Days (≥50mm)▼

#	Date	mm
1	06 Dec 1978	106.0
2	27 Sep 1973	103.3
3	05 Aug 1986	102.4
4	09 Oct 2008	100.1
5	12 Dec 1964	99.1
6	02 Nov 1979	98.0
7	27 Nov 1944	95.3
8	06 Mar 1974	90.3
9	12 May 1974	90.2
10	04 Dec 2015	87.8

Key Conclusions▼

Annual rainfall increased (+2.7mm/year) - statistically significant
Extreme single-day events NOT increasing
1970s-1980s saw peak extreme activity
~2 severe days/year (≥50mm) is the baseline
Prepare for up to ~180mm over 3 days (Dec 1964 precedent)

Source: Glengarriff (Ilnacullin) station, Met Eireann

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Flood Alert Status

Bridge Clearance 98%

Weather Station

Met Eireann Forecast

Yr.no Forecast

Open-Meteo Forecast

6-Hour Rain Forecast — Consensus

6-Day Rainfall Outlook — Consensus

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Glengarriff Rainfall Analysis (1941-2022)