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M2 wave buoy daily means for Aug 2012

Daily means from the M2 wave buoy for Aug 2012, 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

738 wave-buoy observations covered all 31 days. Typical wave height was 3.1 ft (10th–90th percentile 1–6.3 ft), while mean peak wave period was 6 seconds (10th–90th percentile 3.5–8.8 seconds). Typical wind was 13.4 mph (10th–90th percentile 5.2–21.9 mph) and mean water temperature was 14.7°C (10th–90th percentile 13.9–15.2°C). 3 of 4,425 checked values (0.1%) were excluded by quality control. Across 2 comparable years, mean wave height was above the same-month mean of 2.6 ft and mean wave period was above the same-month mean of 4.6 seconds.

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

Typical Significant Wave Height

3.1ft
Mean: 3.3 ft
P10–P90: 1 — 6.3 ft
Recorded extremes

0 — 12.8 ft

Mean Observed Wave Period

6secs
P10–P90: 3.5 — 8.8secs
Recorded extremes

2.1 — 12.8secs

Available for 735 of 738 hourly samples

Typical Observed Wind

S, 13.4mph
Mean: 13.8 mph
P10–P90: 5.2 — 21.9 mph
Recorded extremes

0.2 — 31.4 mph

Circular concentration: 47%

Available for 737 of 738 hourly samples

Mean Water Temperature

14.7°C
P10–P90: 13.9 — 15.2°C
Recorded extremes

13.6 — 15.8°C

Available for 736 of 738 hourly samples

Compared With Previous Augusts

Historical baseline from 1,317 observations across 2 years.

Wave Height
3.3ft
0.7ft above mean
Historical mean 2.559ft
Wave Period
6s
1.4s above mean
Historical mean 4.6s
Water Temperature
14.7°C
0.1°C below mean
Historical mean 14.8°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 2012Last observation shown
Metric
Mean significant wave height (ft)6343221111224358542323224374652
Mean maximum wave height (ft)945422210033547128634343354116883
Mean peak period (s)7757744666455769898555556577665
Mean zero-crossing period (s)5445433454444446555444444455554
Mean peak wave directionSconcentration 100%Sconcentration 98%Sconcentration 98%SSEconcentration 99%SSEconcentration 59%NWconcentration 58%Sconcentration 80%Sconcentration 93%SSEconcentration 79%SEconcentration 64%ENEconcentration 98%ENEconcentration 91%SSEconcentration 97%Sconcentration 99%ESEconcentration 75%Sconcentration 83%Sconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 99%SSEconcentration 96%SSWconcentration 77%Sconcentration 88%SSEconcentration 94%NNEconcentration 42%Variableconcentration 22%Sconcentration 100%Sconcentration 100%Sconcentration 99%Nconcentration 64%Variableconcentration 20%
Mean wave directionSSEconcentration 100%Sconcentration 99%SSEconcentration 100%SSEconcentration 99%SEconcentration 62%NWconcentration 61%Sconcentration 94%SSEconcentration 97%SSEconcentration 96%SSEconcentration 87%Econcentration 98%Econcentration 89%SSEconcentration 99%Sconcentration 100%ESEconcentration 83%Sconcentration 83%SSEconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSEconcentration 99%SSWconcentration 96%Sconcentration 98%SSEconcentration 95%NNEconcentration 60%Wconcentration 39%Sconcentration 100%Sconcentration 99%Sconcentration 100%Nconcentration 68%Variableconcentration 26%
Mean directional spread (°)22.325.727.824.229.033.837.429.436.331.925.833.326.421.323.421.221.626.426.725.728.734.032.530.623.429.617.823.221.625.234.5
Mean wind directionSconcentration 96%Sconcentration 97%SSEconcentration 99%Econcentration 80%NNWconcentration 82%Wconcentration 72%SSWconcentration 82%Variableconcentration 30%ESEconcentration 70%Econcentration 93%Econcentration 99%SEconcentration 90%SSEconcentration 95%SSEconcentration 89%ESEconcentration 85%Sconcentration 96%SSEconcentration 96%SSWconcentration 98%Sconcentration 96%Sconcentration 99%SSWconcentration 90%WSWconcentration 86%SSWconcentration 89%ESEconcentration 84%Nconcentration 90%WSWconcentration 51%Sconcentration 92%SSWconcentration 91%Sconcentration 89%Nconcentration 93%WSWconcentration 67%
Mean wind speed (mph)2114181051010447131018132121181613161314131214142319201812
Mean water temperature(°C)14.014.014.113.914.014.014.214.314.815.114.814.915.014.814.714.514.714.614.714.915.115.115.215.215.115.215.015.115.215.014.9

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.

Observation data source

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

› Wave Buoy List