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M2 wave buoy daily means for Nov 2017

Daily means from the M2 wave buoy for Nov 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

676 wave-buoy observations covered all 30 days. Typical wave height was 6.2 ft (10th–90th percentile 4.1–7.7 ft), while mean peak wave period was 6.1 seconds (10th–90th percentile 4.6–9 seconds). Typical wind was 24.1 mph (10th–90th percentile 18.4–27.2 mph) and mean water temperature was 13.4°C (10th–90th percentile 12.9–14°C). 2 of 1,515 checked values (0.1%) were excluded by quality control. Across 6 comparable years, mean wave height was above the same-month mean of 4.9 ft and mean wave period was above the same-month mean of 5.9 seconds.

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

Typical Significant Wave Height

6.2ft
Mean: 6 ft
P10–P90: 4.1 — 7.7 ft
Recorded extremes

3.1 — 11.8 ft

Available for 209 of 676 hourly samples

Mean Observed Wave Period

6.1secs
P10–P90: 4.6 — 9secs
Recorded extremes

3.9 — 12.1secs

Available for 207 of 676 hourly samples

Typical Observed Wind

NNE, 24.1mph
Mean: 23.3 mph
P10–P90: 18.4 — 27.2 mph
Recorded extremes

4.6 — 35.4 mph

Circular concentration: 100%

Available for 209 of 676 hourly samples

Mean Water Temperature

13.4°C
P10–P90: 12.9 — 14°C
Recorded extremes

12.1 — 14.3°C

Compared With Previous Novembers

Historical baseline from 4,228 observations across 6 years.

Wave Height
6ft
1.1ft above mean
Historical mean 4.888ft
Wave Period
6.1s
0.2s above mean
Historical mean 5.9s
Water Temperature
13.4°C
0.1°C above mean
Historical mean 13.3°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 Nov 2017Last observation shown
Metric
Mean significant wave height (ft)--------------------5874656667
Mean maximum wave height (ft)--------------------81210697910910
Mean peak period (s)--------------------5976555666
Mean zero-crossing period (s)--------------------4654444555
Mean peak wave direction--------------------NNEconcentration 99%Variableconcentration 10%Nconcentration 64%Nconcentration 48%NEconcentration 64%NNEconcentration 48%NNEconcentration 82%NEconcentration 53%Nconcentration 34%NNEconcentration 34%
Mean wave direction--------------------NNEconcentration 100%---------
Mean directional spread (°)--------------------20.222.629.928.825.829.728.327.127.227.1
Mean wind direction--------------------NNEconcentration 100%---------
Mean wind speed (mph)--------------------25172419262324252325
Mean water temperature(°C)14.214.114.114.013.913.913.913.813.813.613.513.413.313.313.213.113.012.912.913.013.313.113.213.213.213.113.012.912.712.5

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