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M2 wave buoy daily means for Nov 2012

Daily means from the M2 wave buoy for Nov 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

719 wave-buoy observations covered all 30 days. Typical wave height was 4.1 ft (10th–90th percentile 1.5–8.7 ft), while mean peak wave period was 6 seconds (10th–90th percentile 3.8–9.4 seconds). Typical wind was 18.8 mph (10th–90th percentile 10.1–27.5 mph) and mean water temperature was 12.7°C (10th–90th percentile 12.1–13.2°C). 3 of 4,314 checked values (0.1%) were excluded by quality control. Across 2 comparable years, mean wave height was below the same-month mean of 5.4 ft and mean wave period was below the same-month mean of 6.3 seconds.

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

Typical Significant Wave Height

4.1ft
Mean: 4.8 ft
P10–P90: 1.5 — 8.7 ft
Recorded extremes

0.5 — 15.4 ft

Mean Observed Wave Period

6secs
P10–P90: 3.8 — 9.4secs
Recorded extremes

2.5 — 13.2secs

Available for 716 of 719 hourly samples

Typical Observed Wind

WSW, 18.8mph
Mean: 18.8 mph
P10–P90: 10.1 — 27.5 mph
Recorded extremes

0.7 — 36.7 mph

Circular concentration: 50%

Mean Water Temperature

12.7°C
P10–P90: 12.1 — 13.2°C
Recorded extremes

12 — 13.4°C

Compared With Previous Novembers

Historical baseline from 1,364 observations across 2 years.

Wave Height
4.8ft
0.6ft below mean
Historical mean 5.446ft
Wave Period
6s
0.3s below mean
Historical mean 6.3s
Water Temperature
12.7°C
0.6°C below 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 2012Last observation shown
Metric
Mean significant wave height (ft)464644446334752234117510634108421
Mean maximum wave height (ft)585966659546117224616107148561512631
Mean peak period (s)6556555465467665459689119877545
Mean zero-crossing period (s)444544445444554334655655565433
Mean peak wave directionSWconcentration 66%WSWconcentration 89%SWconcentration 87%SSEconcentration 79%NNEconcentration 68%WNWconcentration 91%WSWconcentration 78%Wconcentration 87%Sconcentration 98%SWconcentration 78%WNWconcentration 89%Sconcentration 98%Sconcentration 99%Sconcentration 100%Sconcentration 95%Sconcentration 62%Wconcentration 91%SWconcentration 82%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 98%SSEconcentration 71%Econcentration 40%NNEconcentration 91%Nconcentration 99%NNEconcentration 98%Nconcentration 77%Variableconcentration 23%
Mean wave directionSWconcentration 90%WSWconcentration 95%SSWconcentration 95%SSEconcentration 82%NNEconcentration 66%WNWconcentration 94%WSWconcentration 85%WSWconcentration 88%Sconcentration 100%SWconcentration 87%WNWconcentration 90%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 97%Sconcentration 85%Wconcentration 95%SWconcentration 84%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 100%SSWconcentration 99%SSEconcentration 70%ENEconcentration 52%NNEconcentration 94%Nconcentration 99%Nconcentration 99%NNWconcentration 88%Variableconcentration 26%
Mean directional spread (°)28.630.428.323.829.124.125.728.418.229.528.923.820.324.631.238.124.624.322.119.723.619.937.125.326.823.022.928.241.235.0
Mean wind directionWconcentration 91%Wconcentration 96%SWconcentration 90%SEconcentration 69%Nconcentration 80%Wconcentration 98%WSWconcentration 94%WSWconcentration 86%SWconcentration 93%Wconcentration 90%WNWconcentration 90%SSWconcentration 97%SSWconcentration 99%SSWconcentration 98%SSWconcentration 97%Wconcentration 91%Wconcentration 93%SWconcentration 81%SSWconcentration 99%SSWconcentration 95%SSWconcentration 97%SWconcentration 96%WSWconcentration 97%ESEconcentration 53%Variableconcentration 24%Nconcentration 96%Nconcentration 96%Nconcentration 95%NNWconcentration 87%WNWconcentration 57%
Mean wind speed (mph)19221922172121192116141826181110172031241825191217292517106
Mean water temperature(°C)13.313.313.313.013.113.113.113.012.912.912.812.812.812.712.912.712.712.612.512.512.512.412.412.412.312.212.112.112.012.0

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