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M2 wave buoy daily means for Nov 2020

Daily means from the M2 wave buoy for Nov 2020, 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 4.2 ft (10th–90th percentile 1.9–9.2 ft), while mean peak wave period was 5.9 seconds (10th–90th percentile 3.8–8.2 seconds). Typical wind was 19.2 mph (10th–90th percentile 8.5–30.5 mph) and mean water temperature was 13.2°C (10th–90th percentile 12.7–13.6°C). All 2,874 checked values passed quality control. Across 9 comparable years, mean wave height was the same as the same-month mean of 5 ft and mean wave period was below the same-month mean of 6 seconds.

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

Typical Significant Wave Height

4.2ft
Mean: 5 ft
P10–P90: 1.9 — 9.2 ft
Recorded extremes

0.4 — 14.6 ft

Available for 239 of 719 hourly samples

Mean Observed Wave Period

5.9secs
P10–P90: 3.8 — 8.2secs
Recorded extremes

2.1 — 11.4secs

Available for 239 of 719 hourly samples

Typical Observed Wind

SW, 19.2mph
Mean: 19.5 mph
P10–P90: 8.5 — 30.5 mph
Recorded extremes

1.1 — 38.5 mph

Circular concentration: 50%

Mean Water Temperature

13.2°C
P10–P90: 12.7 — 13.6°C
Recorded extremes

12.5 — 13.8°C

Compared With Previous Novembers

Historical baseline from 6,340 observations across 9 years.

Wave Height
5ft
0ft above mean
Historical mean 4.954ft
Wave Period
5.9s
0.1s below mean
Historical mean 6s
Water Temperature
13.2°C
In line with the historical mean
Historical mean 13.2°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 2020Last observation shown
Metric
Mean significant wave height (ft)1185322333497778679656369321324
Mean maximum wave height (ft)1612752234451310101111911149684812431425
Mean peak period (s)985444557787777677557458546544
Mean zero-crossing period (s)665433444465556556545445433444
Mean peak wave directionSconcentration 100%SSWconcentration 85%Wconcentration 89%NWconcentration 99%Wconcentration 36%ESEconcentration 61%ENEconcentration 97%ESEconcentration 77%Sconcentration 98%Sconcentration 100%Sconcentration 100%SSWconcentration 85%Sconcentration 97%Sconcentration 99%SSWconcentration 87%SWconcentration 72%Sconcentration 100%SSWconcentration 89%NWconcentration 72%Sconcentration 95%Sconcentration 88%WSWconcentration 99%SSWconcentration 91%Sconcentration 100%Wconcentration 73%WNWconcentration 93%SEconcentration 56%Econcentration 87%NEconcentration 56%Wconcentration 92%
Mean wave directionSconcentration 100%SSWconcentration 95%WSWconcentration 87%NWconcentration 98%WSWconcentration 63%SEconcentration 85%Econcentration 93%SEconcentration 81%SSEconcentration 99%Sconcentration 97%Sconcentration 100%SSWconcentration 92%Sconcentration 100%Sconcentration 99%SSWconcentration 96%SWconcentration 82%Sconcentration 100%SSWconcentration 93%WNWconcentration 81%SSWconcentration 99%SSWconcentration 97%WSWconcentration 100%SSWconcentration 94%Sconcentration 99%WSWconcentration 86%WNWconcentration 95%SEconcentration 78%Econcentration 91%Econcentration 59%Wconcentration 90%
Mean directional spread (°)17.621.430.225.831.330.933.442.426.019.516.320.620.221.424.428.519.322.129.519.919.528.120.617.425.329.737.436.441.323.6
Mean wind directionSSWconcentration 83%WSWconcentration 91%Wconcentration 88%NWconcentration 98%Wconcentration 76%ESEconcentration 89%ESEconcentration 64%SSEconcentration 95%SEconcentration 98%Sconcentration 94%Sconcentration 86%SSWconcentration 82%SWconcentration 95%Sconcentration 94%SWconcentration 86%SWconcentration 84%SSWconcentration 99%SWconcentration 84%WNWconcentration 87%SSWconcentration 97%WSWconcentration 88%Wconcentration 99%SSWconcentration 97%SSWconcentration 68%WNWconcentration 98%WNWconcentration 94%Sconcentration 59%Econcentration 96%Variableconcentration 15%WNWconcentration 83%
Mean wind speed (mph)292421161110813131930262427262428312221211824271511811621
Mean water temperature(°C)13.713.613.613.513.613.613.613.613.613.513.513.513.413.413.313.213.213.213.113.113.012.912.812.812.812.812.712.712.712.6

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