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M2 wave buoy daily means for Feb 2017

Daily means from the M2 wave buoy for Feb 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

670 wave-buoy observations covered all 28 days. Typical wave height was 4.4 ft (10th–90th percentile 2.3–9.9 ft), while mean peak wave period was 6.6 seconds (10th–90th percentile 4.2–9.4 seconds). Typical wind was 17.6 mph (10th–90th percentile 8.8–28.5 mph) and mean water temperature was 9.4°C (10th–90th percentile 9.1–9.7°C). 6 of 4,020 checked values (0.1%) were excluded by quality control. Across 7 comparable years, mean wave height was above the same-month mean of 4.1 ft and mean wave period was above the same-month mean of 5.2 seconds.

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

Typical Significant Wave Height

4.4ft
Mean: 5.4 ft
P10–P90: 2.3 — 9.9 ft
Recorded extremes

1.5 — 15.8 ft

Mean Observed Wave Period

6.6secs
P10–P90: 4.2 — 9.4secs
Recorded extremes

2.8 — 17.7secs

Available for 664 of 670 hourly samples

Typical Observed Wind

SSW, 17.6mph
Mean: 18.4 mph
P10–P90: 8.8 — 28.5 mph
Recorded extremes

1 — 40.9 mph

Circular concentration: 43%

Mean Water Temperature

9.4°C
P10–P90: 9.1 — 9.7°C
Recorded extremes

9 — 9.9°C

Compared With Previous Februarys

Historical baseline from 3,522 observations across 7 years.

Wave Height
5.4ft
1.3ft above mean
Historical mean 4.134ft
Wave Period
6.6s
1.4s above mean
Historical mean 5.2s
Water Temperature
9.4°C
0.8°C above mean
Historical mean 8.6°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 Feb 2017Last observation shown
Metric
Mean significant wave height (ft)510842743547910744352334947745
Mean maximum wave height (ft)71511631064761014151055473456136111168
Mean peak period (s)88-5878865688755565456757885
Mean zero-crossing period (s)5664455444566544444444546555
Mean peak wave directionSconcentration 99%Sconcentration 100%Sconcentration 97%SWconcentration 79%Sconcentration 88%Sconcentration 90%Sconcentration 66%SSEconcentration 39%SEconcentration 88%ENEconcentration 96%NNEconcentration 97%NEconcentration 97%ENEconcentration 99%Econcentration 83%Sconcentration 99%Sconcentration 94%Sconcentration 97%Sconcentration 99%Sconcentration 99%WSWconcentration 88%Sconcentration 90%SSWconcentration 77%Wconcentration 46%Wconcentration 67%Sconcentration 100%Sconcentration 99%Sconcentration 90%Wconcentration 91%
Mean wave directionSconcentration 100%SSEconcentration 100%Sconcentration 76%SSWconcentration 89%Sconcentration 92%Sconcentration 92%SSWconcentration 58%Variableconcentration 23%SEconcentration 96%Econcentration 96%NNEconcentration 97%NEconcentration 98%ENEconcentration 99%Econcentration 88%SSEconcentration 98%Sconcentration 97%Sconcentration 100%Sconcentration 100%Sconcentration 99%SWconcentration 98%SSWconcentration 97%SSWconcentration 97%Wconcentration 51%WSWconcentration 69%Sconcentration 100%Sconcentration 100%Sconcentration 95%Wconcentration 90%
Mean directional spread (°)21.718.035.725.625.323.029.334.137.431.823.222.420.129.727.724.825.019.321.731.732.530.522.427.319.019.626.424.8
Mean wind directionSconcentration 96%SSEconcentration 98%WSWconcentration 52%SWconcentration 76%Wconcentration 89%Sconcentration 91%WNWconcentration 76%Variableconcentration 4%SEconcentration 93%Econcentration 91%NNEconcentration 98%ENEconcentration 93%Econcentration 99%SEconcentration 83%Sconcentration 84%SWconcentration 97%Sconcentration 97%SSWconcentration 95%SWconcentration 95%Wconcentration 96%SWconcentration 93%WSWconcentration 88%Wconcentration 77%WSWconcentration 81%SWconcentration 85%SWconcentration 93%WSWconcentration 85%WNWconcentration 95%
Mean wind speed (mph)20301817102314121716232628171715161810131513302019231323
Mean water temperature(°C)9.89.89.89.79.79.79.69.69.59.59.49.39.39.29.39.29.29.29.39.39.29.29.29.19.29.29.19.1

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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