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M2 wave buoy daily means for Jan 2012

Daily means from the M2 wave buoy for Jan 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

742 wave-buoy observations covered all 31 days. Typical wave height was 4.4 ft (10th–90th percentile 2.1–7.7 ft), while mean peak wave period was 5.4 seconds (10th–90th percentile 3.9–6.9 seconds). Typical wind was 17 mph (10th–90th percentile 15.2–19.3 mph) and mean water temperature was 9.7°C (10th–90th percentile 9.3–10.1°C). 1 of 3,723 checked values (0%) were excluded by quality control. Across 1 comparable year, mean wave height was above the same-month mean of 4.7 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

4.4ft
Mean: 4.8 ft
P10–P90: 2.1 — 7.7 ft
Recorded extremes

0.8 — 13.6 ft

Mean Observed Wave Period

5.4secs
P10–P90: 3.9 — 6.9secs
Recorded extremes

2.1 — 23.8secs

Available for 741 of 742 hourly samples

Typical Observed Wind

WSW, 17mph
Mean: 17.1 mph
P10–P90: 15.2 — 19.3 mph
Recorded extremes

12.6 — 19.7 mph

Circular concentration: 57%

Available for 13 of 742 hourly samples

Mean Water Temperature

9.7°C
P10–P90: 9.3 — 10.1°C
Recorded extremes

9.1 — 10.5°C

Compared With Previous Januarys

Historical baseline from 731 observations across 1 year.

Wave Height
4.8ft
0.1ft above mean
Historical mean 4.724ft
Wave Period
5.4s
0.8s above mean
Historical mean 4.6s
Water Temperature
9.7°C
0.6°C above mean
Historical mean 9.1°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 Jan 2012Last observation shown
Metric
Mean significant wave height (ft)67118845333342354545666QC rejectedQC rejected856QC rejected55QC rejected
Mean maximum wave height (ft)810171212573444624857678994411883874
Mean peak period (s)6676645454556476565565467655565
Mean zero-crossing period (s)5565544444444454444455445544454
Mean peak wave directionSSWconcentration 92%SSWconcentration 95%SWconcentration 82%WSWconcentration 91%WNWconcentration 89%WSWconcentration 64%WNWconcentration 98%WSWconcentration 89%SSWconcentration 80%SSWconcentration 87%Sconcentration 91%Wconcentration 45%Variableconcentration 20%Sconcentration 96%Sconcentration 94%Sconcentration 96%Sconcentration 99%SSWconcentration 86%WSWconcentration 92%Wconcentration 98%WNWconcentration 89%WNWconcentration 89%WNWconcentration 98%Sconcentration 72%Sconcentration 99%SWconcentration 77%WNWconcentration 87%Econcentration 40%Sconcentration 98%SEconcentration 78%ESEconcentration 88%
Mean wave directionSSWconcentration 97%SSWconcentration 98%SWconcentration 89%WSWconcentration 95%WNWconcentration 90%WSWconcentration 66%Wconcentration 98%WSWconcentration 90%SWconcentration 90%SSWconcentration 94%SSWconcentration 98%WNWconcentration 53%NEconcentration 46%Sconcentration 99%SSEconcentration 98%Sconcentration 98%Sconcentration 100%SSWconcentration 98%WSWconcentration 91%Wconcentration 95%Wconcentration 91%WNWconcentration 90%WNWconcentration 98%SSWconcentration 80%Sconcentration 100%SSWconcentration 86%Wconcentration 86%ESEconcentration 44%Sconcentration 98%SEconcentration 93%ESEconcentration 95%
Mean directional spread (°)21.222.024.425.024.628.827.131.533.224.627.736.840.325.522.726.319.927.224.629.625.025.432.329.721.125.926.438.820.733.341.1
Mean wind directionSWconcentration 93%WSWconcentration 96%WSWconcentration 85%Wconcentration 97%WNWconcentration 96%Wconcentration 89%WNWconcentration 98%Wconcentration 95%WSWconcentration 88%SWconcentration 94%WSWconcentration 95%WNWconcentration 90%Variableconcentration 19%SSEconcentration 98%SSEconcentration 96%Sconcentration 98%Sconcentration 99%WSWconcentration 85%Wconcentration 96%Wconcentration 96%Wconcentration 98%Wconcentration 94%WNWconcentration 96%SWconcentration 84%SSWconcentration 87%WSWconcentration 82%WNWconcentration 87%Wconcentration 36%SSEconcentration 94%SEconcentration 99%ESEconcentration 99%
Mean wind speed (mph)------------------------------17
Mean water temperature(°C)10.410.310.310.09.99.89.89.89.89.89.89.89.79.79.79.79.79.79.69.59.59.59.49.49.49.49.39.39.29.29.3

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