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M2 wave buoy daily means for Sep 2011

Daily means from the M2 wave buoy for Sep 2011, 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

703 wave-buoy observations covered all 30 days. Typical wave height was 3.8 ft (10th–90th percentile 1.8–7.2 ft), while mean peak wave period was 5.5 seconds (10th–90th percentile 3.9–7.3 seconds). Mean water temperature was 14.3°C (10th–90th percentile 13.9–14.7°C). 10 of 2,812 checked values (0.4%) were excluded by quality control. Across 1 comparable year, mean wave height was above the same-month mean of 3.1 ft and mean wave period was above the same-month mean of 4.2 seconds.

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

Typical Significant Wave Height

3.8ft
Mean: 4.3 ft
P10–P90: 1.8 — 7.2 ft
Recorded extremes

0.5 — 11 ft

Mean Observed Wave Period

5.5secs
P10–P90: 3.9 — 7.3secs
Recorded extremes

2.2 — 13.8secs

Available for 693 of 703 hourly samples

Typical Observed Wind

-, -mph
Mean: - mph
P10–P90: - — - mph

Available for 0 of 703 hourly samples

Mean Water Temperature

14.3°C
P10–P90: 13.9 — 14.7°C
Recorded extremes

13.5 — 14.9°C

Compared With Previous Septembers

Historical baseline from 585 observations across 1 year.

Wave Height
4.3ft
1.2ft above mean
Historical mean 3.117ft
Wave Period
5.5s
1.3s above mean
Historical mean 4.2s
Water Temperature
14.3°C
Not enough comparable data

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 Sep 2011Last observation shown
Metric
Mean significant wave height (ft)134358643679742344435455524333
Mean maximum wave height (ft)0464712855911131052466558577736454
Mean peak period (s)546557565677656555556566655567
Mean zero-crossing period (s)444445544556544444445445544445
Mean peak wave directionSSEconcentration 55%Sconcentration 96%Sconcentration 98%Sconcentration 81%SWconcentration 74%SSWconcentration 86%WSWconcentration 98%Sconcentration 97%Sconcentration 95%Sconcentration 99%Sconcentration 99%SSWconcentration 86%SWconcentration 90%Wconcentration 81%SSEconcentration 73%SSEconcentration 91%SWconcentration 77%NWconcentration 88%SWconcentration 42%SSWconcentration 84%SSWconcentration 96%SSWconcentration 89%Sconcentration 99%Sconcentration 98%Sconcentration 100%Sconcentration 99%Sconcentration 99%Sconcentration 84%Sconcentration 97%Sconcentration 96%
Mean wave directionSSEconcentration 81%Sconcentration 97%Sconcentration 98%SSWconcentration 93%SWconcentration 87%SSWconcentration 95%SWconcentration 99%Sconcentration 99%Sconcentration 99%Sconcentration 100%Sconcentration 100%SSWconcentration 92%SWconcentration 93%WSWconcentration 93%SEconcentration 83%SSEconcentration 94%SWconcentration 94%NWconcentration 84%SWconcentration 47%SSWconcentration 99%SSWconcentration 98%SSWconcentration 96%Sconcentration 100%Sconcentration 99%Sconcentration 100%Sconcentration 99%Sconcentration 99%SSEconcentration 97%Sconcentration 99%Sconcentration 98%
Mean directional spread (°)38.223.924.725.525.523.831.823.422.619.719.523.828.633.739.831.727.022.625.325.920.125.818.421.520.526.724.734.128.536.5
Mean wind direction------------------------------
Mean wind speed (mph)------------------------------
Mean water temperature(°C)14.514.614.714.714.614.714.614.614.614.814.714.614.314.114.013.813.914.114.114.014.014.014.014.014.013.913.914.014.114.3

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.

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