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M2 wave buoy daily means for Sep 2016

Daily means from the M2 wave buoy for Sep 2016, 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

716 wave-buoy observations covered all 30 days. Typical wave height was 3.1 ft (10th–90th percentile 1.5–7.2 ft), while mean peak wave period was 5.6 seconds (10th–90th percentile 3.6–8 seconds). Typical wind was 15.4 mph (10th–90th percentile 7.7–24.6 mph). 1 of 3,580 checked values (0%) were excluded by quality control. Across 5 comparable years, mean wave height was above the same-month mean of 3.4 ft and mean wave period was above the same-month mean of 5 seconds.

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

Typical Significant Wave Height

3.1ft
Mean: 3.7 ft
P10–P90: 1.5 — 7.2 ft
Recorded extremes

0.5 — 11.3 ft

Mean Observed Wave Period

5.6secs
P10–P90: 3.6 — 8secs
Recorded extremes

2.5 — 13.1secs

Available for 715 of 716 hourly samples

Typical Observed Wind

SSW, 15.4mph
Mean: 15.8 mph
P10–P90: 7.7 — 24.6 mph
Recorded extremes

1 — 33.2 mph

Circular concentration: 61%

Mean Water Temperature

-°C
P10–P90: - — -°C

Available for 0 of 716 hourly samples

Compared With Previous Septembers

Historical baseline from 3,421 observations across 5 years.

Wave Height
3.7ft
0.3ft above mean
Historical mean 3.379ft
Wave Period
5.6s
0.6s above mean
Historical mean 5s
Water Temperature
–
Not enough comparable data
Historical mean 14.4°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 Sep 2016Last observation shown
Metric
Mean significant wave height (ft)333333247358441322213359534553
Mean maximum wave height (ft)444545251058125614323144714746784
Mean peak period (s)465855457867655545464468667565
Mean zero-crossing period (s)444444445556444444344446545454
Mean peak wave directionSWconcentration 69%Sconcentration 97%SSEconcentration 92%Sconcentration 99%Sconcentration 99%Sconcentration 99%SSEconcentration 81%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 100%Variableconcentration 10%NNEconcentration 98%Econcentration 30%WNWconcentration 90%Nconcentration 42%Sconcentration 91%Nconcentration 65%SSEconcentration 56%Sconcentration 97%SWconcentration 69%Sconcentration 98%Sconcentration 100%Sconcentration 97%Sconcentration 99%Sconcentration 94%SSWconcentration 87%SWconcentration 84%SSWconcentration 84%
Mean wave directionSSWconcentration 83%Sconcentration 99%SSEconcentration 91%Sconcentration 90%SSEconcentration 99%Sconcentration 100%SSEconcentration 92%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 100%Variableconcentration 6%NNEconcentration 97%SEconcentration 65%WNWconcentration 94%Nconcentration 48%Sconcentration 98%Nconcentration 64%SSEconcentration 72%Sconcentration 99%SSWconcentration 86%Sconcentration 100%Sconcentration 100%SSWconcentration 99%Sconcentration 99%SSWconcentration 94%SSWconcentration 95%SWconcentration 93%SSWconcentration 95%
Mean directional spread (°)30.531.626.327.426.824.332.923.117.221.118.617.722.022.442.028.439.828.134.135.925.426.821.117.019.821.822.124.627.532.3
Mean wind directionSWconcentration 82%SWconcentration 95%Sconcentration 66%WSWconcentration 68%Sconcentration 96%Sconcentration 100%SSEconcentration 84%SSWconcentration 96%SSWconcentration 89%SWconcentration 88%Sconcentration 93%Sconcentration 98%NNWconcentration 58%NNEconcentration 62%Sconcentration 86%WNWconcentration 99%Wconcentration 50%SSWconcentration 62%NNWconcentration 95%SWconcentration 77%Sconcentration 85%SWconcentration 78%SSWconcentration 92%Sconcentration 99%SWconcentration 95%Sconcentration 81%SSWconcentration 79%SSWconcentration 91%WSWconcentration 98%WSWconcentration 90%
Mean wind speed (mph)1712131214171318231121241616817101211815162028181117212213
Mean water temperature(°C)------------------------------

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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