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M2 wave buoy daily means for Aug 2017

Daily means from the M2 wave buoy for Aug 2017, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Data available:  to 

Monthly means for

Latest

Period Summary

Programmatically generated summary. Hog Says

744 wave-buoy observations covered all 31 days. Typical wave height was 2.3 ft (10th–90th percentile 1.3–4.6 ft), while mean peak wave period was 4.9 seconds (10th–90th percentile 3.3–6.9 seconds). Typical wind was 12 mph (10th–90th percentile 6.1–19.8 mph) and mean water temperature was 14.3°C (10th–90th percentile 13.9–14.8°C). 2 of 4,464 checked values (0%) were excluded by quality control. Across 6 comparable years, mean wave height was the same as the same-month mean of 2.7 ft and mean wave period was below the same-month mean of 5.2 seconds.

Generated only from the observations and comparisons shown on this page.

Typical Significant Wave Height

2.3ft
Mean: 2.7 ft
P10–P90: 1.3 — 4.6 ft
Recorded extremes

0.6 — 8.5 ft

Mean Observed Wave Period

4.9secs
P10–P90: 3.3 — 6.9secs
Recorded extremes

2.2 — 9.6secs

Available for 742 of 744 hourly samples

Typical Observed Wind

SW, 12mph
Mean: 12.5 mph
P10–P90: 6.1 — 19.8 mph
Recorded extremes

0.8 — 31.8 mph

Circular concentration: 56%

Mean Water Temperature

14.3°C
P10–P90: 13.9 — 14.8°C
Recorded extremes

13.2 — 15.6°C

Compared With Previous Augusts

Historical baseline from 3,615 observations across 6 years.

Wave Height
2.7ft
0ft above mean
Historical mean 2.69ft
Wave Period
4.9s
0.3s below mean
Historical mean 5.2s
Water Temperature
14.3°C
In line with the historical mean
Historical mean 14.3°C

Chart showing grouped wave observations for M2. Use the table on this page for a text version of the same measurements. To open hourly observations, use a linked day name in the table.

About M2 wave buoy

M2 (WMO 62091) is part of the Irish Marine Data Buoy Observation Network, managed by the Marine Institute in collaboration with Met Éireann. Moored in the Irish Sea east of Ireland, it provides open-water context for the busy, relatively enclosed waters between the Irish and British coasts.

Its current data source reports wave height, wave period, wave direction, directional spread, wind conditions and sea temperature.

Metrics are rows; days run left to right.
M2 wave buoy daily means Aug 2017Last observation shown
Metric
Mean significant wave height (ft)3553233243331535444222222123221
Mean maximum wave height (ft)4674243254442748666333333124222
Mean peak period (s)5676544455545556754465454465444
Mean zero-crossing period (s)4454344344444444544444444344333
Mean peak wave directionSconcentration 99%Sconcentration 98%Sconcentration 100%SSWconcentration 50%SSWconcentration 69%SSWconcentration 76%SSWconcentration 87%Nconcentration 55%NNEconcentration 94%NNEconcentration 49%Sconcentration 93%WNWconcentration 59%Econcentration 48%Sconcentration 99%Sconcentration 85%Sconcentration 99%Sconcentration 100%SSWconcentration 89%Wconcentration 95%Sconcentration 38%SSEconcentration 93%Sconcentration 83%SSEconcentration 97%Sconcentration 91%SSEconcentration 99%Variableconcentration 21%Sconcentration 96%Sconcentration 92%NWconcentration 42%WSWconcentration 74%WSWconcentration 45%
Mean wave directionSconcentration 100%Sconcentration 97%Sconcentration 100%SWconcentration 84%SSWconcentration 81%SSWconcentration 90%SSWconcentration 97%NNWconcentration 49%NNEconcentration 95%Nconcentration 50%Sconcentration 98%Wconcentration 55%ESEconcentration 68%Sconcentration 99%SSWconcentration 93%Sconcentration 100%Sconcentration 100%SSWconcentration 97%WSWconcentration 98%Sconcentration 61%SSEconcentration 97%SSEconcentration 95%SSEconcentration 99%Sconcentration 97%Sconcentration 99%Sconcentration 58%Sconcentration 98%Sconcentration 100%WNWconcentration 71%WSWconcentration 88%WSWconcentration 44%
Mean directional spread (°)21.921.318.232.333.622.129.831.023.131.224.333.547.320.226.120.320.224.830.240.730.129.930.827.527.633.523.722.733.424.638.1
Mean wind directionSSWconcentration 98%Sconcentration 89%SWconcentration 89%Wconcentration 91%Wconcentration 76%SWconcentration 90%SWconcentration 92%NNWconcentration 94%Nconcentration 98%Wconcentration 46%SWconcentration 91%Wconcentration 92%ESEconcentration 67%Sconcentration 98%SWconcentration 70%Sconcentration 99%SSWconcentration 94%WSWconcentration 92%Wconcentration 99%Sconcentration 40%SEconcentration 85%SSEconcentration 85%SSWconcentration 92%SSWconcentration 91%SSWconcentration 99%SWconcentration 61%Sconcentration 96%SSWconcentration 83%Wconcentration 85%WSWconcentration 80%WNWconcentration 78%
Mean wind speed (mph)131915119151312141114118171321131717118121011127121310128
Mean water temperature(°C)14.114.214.414.414.414.314.314.314.214.013.814.014.314.114.514.514.314.514.314.314.214.114.114.214.314.714.514.614.514.815.1

Swipe sideways to see more days.

Wave metric colour key

Colours move through the scale as each number increases. They do not by themselves mean that conditions are good, safe or suitable for you.

Wave & swell height0–40+ ft
Wave & swell period0–22+ s
Wind speed0–75 mph

The displayed numbers remain the source of truth; colour is an additional visual cue.

What does buoy wave power mean?

kW/m means kilowatts of wave power per metre of wave crest. It describes the rate at which the observed sea state carries energy past the buoy.

Unlike the shore-directed forecast value, buoy wave power is the total power at the observation point. It is not projected towards a particular beach and does not predict breaking wave height.

In deep water, wave power can be calculated with:

P is approximately 0.49 times significant wave height squared times wave energy period.

P is power in kW/m, Hs is significant wave height in metres, and Te is wave energy period in seconds.

  • Provider-reported power is used when available.
  • Otherwise, a value is calculated only when both significant height and a genuine energy period are available. The ≈ symbol marks calculated values.
  • A dash is shown instead of substituting peak, Tm02, zero-crossing or other period measurements.
  • Daily and monthly figures use the mean of hourly-normalized observation power values; they are not calculated from mean height and period.

Wave direction, spectrum, water depth and local bathymetry still matter. Wave power is best read alongside height, period and direction rather than as a standalone surf-quality score.

The observation data displayed on this page is from the Met Éireann Irish Marine Data Buoy Observation Network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

› Wave Buoy List