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M2 wave buoy daily means for Jan 2017

Daily means from the M2 wave buoy for Jan 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

742 wave-buoy observations covered all 31 days. Typical wave height was 3.7 ft (10th–90th percentile 1.2–8.2 ft), while mean peak wave period was 5.7 seconds (10th–90th percentile 3.8–7.7 seconds). Typical wind was 17.4 mph (10th–90th percentile 5.6–26 mph) and mean water temperature was 10.1°C (10th–90th percentile 9.8–10.5°C). 3 of 4,452 checked values (0.1%) were excluded by quality control. Across 6 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 5.8 seconds.

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

Typical Significant Wave Height

3.7ft
Mean: 4.2 ft
P10–P90: 1.2 — 8.2 ft
Recorded extremes

0.6 — 10.8 ft

Mean Observed Wave Period

5.7secs
P10–P90: 3.8 — 7.7secs
Recorded extremes

2.2 — 16.5secs

Available for 739 of 742 hourly samples

Typical Observed Wind

SW, 17.4mph
Mean: 16.4 mph
P10–P90: 5.6 — 26 mph
Recorded extremes

0.3 — 31.6 mph

Circular concentration: 45%

Mean Water Temperature

10.1°C
P10–P90: 9.8 — 10.5°C
Recorded extremes

9.5 — 10.6°C

Compared With Previous Januarys

Historical baseline from 4,384 observations across 6 years.

Wave Height
4.2ft
1.2ft below mean
Historical mean 5.413ft
Wave Period
5.7s
0.1s below mean
Historical mean 5.8s
Water Temperature
10.1°C
0.3°C above mean
Historical mean 9.8°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 2017Last observation shown
Metric
Mean significant wave height (ft)QC rejected544462265757542111132268993345
Mean maximum wave height (ft)1065669329710811753121142381213124468
Mean peak period (s)6545777565656554657854567885466
Mean zero-crossing period (s)5444455354545443334444455664445
Mean peak wave directionNconcentration 80%NNEconcentration 90%WNWconcentration 92%NWconcentration 64%SSEconcentration 89%Sconcentration 100%Sconcentration 96%Sconcentration 92%SSWconcentration 81%Wconcentration 96%WNWconcentration 92%Wconcentration 96%NNWconcentration 97%WNWconcentration 95%WNWconcentration 94%NWconcentration 89%SSEconcentration 54%SSEconcentration 86%SEconcentration 65%SEconcentration 67%ESEconcentration 82%SSEconcentration 96%Sconcentration 90%Sconcentration 100%Sconcentration 100%Sconcentration 99%Sconcentration 99%SWconcentration 57%Sconcentration 78%SEconcentration 85%SEconcentration 87%
Mean wave directionNconcentration 81%Nconcentration 90%WNWconcentration 96%NNWconcentration 77%SSEconcentration 92%Sconcentration 100%Sconcentration 99%Sconcentration 96%SSWconcentration 89%Wconcentration 96%WNWconcentration 92%Wconcentration 95%NWconcentration 99%WNWconcentration 98%WNWconcentration 96%NWconcentration 77%Sconcentration 79%Sconcentration 98%SSEconcentration 94%SEconcentration 89%ESEconcentration 93%SSEconcentration 97%Sconcentration 99%Sconcentration 100%Sconcentration 100%Sconcentration 100%SSEconcentration 100%SWconcentration 77%Sconcentration 90%SEconcentration 96%SSEconcentration 95%
Mean directional spread (°)22.328.527.224.723.018.623.524.723.429.624.328.924.028.229.433.038.729.236.333.835.730.223.817.817.519.423.029.228.431.636.0
Mean wind directionNNEconcentration 94%Nconcentration 83%WNWconcentration 98%NNWconcentration 59%SSEconcentration 90%SWconcentration 86%Wconcentration 81%SWconcentration 89%WSWconcentration 86%Wconcentration 96%WNWconcentration 96%Wconcentration 95%NWconcentration 97%WNWconcentration 98%WNWconcentration 97%WNWconcentration 99%SWconcentration 85%SWconcentration 93%SWconcentration 33%SEconcentration 91%SSEconcentration 98%SSWconcentration 75%SSWconcentration 99%SSWconcentration 100%Sconcentration 98%Sconcentration 98%Sconcentration 98%Wconcentration 82%Sconcentration 67%SEconcentration 90%Sconcentration 74%
Mean wind speed (mph)26161917171871023202422252019127757115162227262314131713
Mean water temperature(°C)10.510.510.510.410.410.410.410.410.410.310.210.210.110.110.010.010.010.010.010.09.99.99.99.89.99.89.89.79.79.79.8

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