Skip to content

Live Wave Data

Up to date information on the conditions at the Wave Hub test site can be found below.

Best efforts are made to ensure continuous data streaming, however, downtime due to technical faults and servicing are possible from time to time. Please refer to the time and date stamps on each output to ensure that the data presented is current.

All times shown are in GMT (UTC). One hour should be added during BST to give the correct local time.

3 Minute Data

Data is received by radio transmission from the wave buoy deployed on site. Every 200 seconds the most up to date data is used to calculate significant wave height (Hs) and zero upcrossing wave period (Tz) at the deployment site. These statistics are useful for assessing rapidly changing sea conditions on site.

Last Updated (19/11/2017)

21:26

Wave Height

0.80m

Wave Period

4.07s

Statistics are based on the most recent 200 seconds of vertical heave data. Due to the fact that these statistics are based on a short dataset, statistics should be interpreted with caution.

Half Hourly Data Table

Wave height, frequency and direction are deduced from the rapid measurement of instantaneous water level (measured as a vertical acceleration) in conjunction with horizontal wave information (measured as horizontal acceleration). The data for the individual vertical movements are stored and analysed to produce a wave energy spectrum every 30 minutes from which, key statistics are derived. Maximum wave height is a deterministic statistic, reported from the observed maximum wave height in the past 30 minutes. In addition to key wave parameters, the time stamp of the data is also provided along with GPS-derived latitude and longitude of the buoy.

Date and Time - (GMT)

19-11-2017 20:30

Latitude Longitude - (WGS84)

50.34658, -5.61524

Wave Height - (Hs)

0.72m

Wave Period - (Tz)

4.1s

Maximum Wave Height - (Hmax)

0.99m

Peak Wave Period - (Tp)

10.5s

Peak Wave Direction - (Dirp)

280°

Wave Directional Spread - (Sprp)

25°

Sea Surface Temperature - (Tsea)

13.1°C

Met Data

Wind speed and direction and air temperature data is available from a shore station located at Perranporth (courtesy of the Channel Coastal Observatory). These data are collected by a Gill Met Pak meteorological station and data are available every 10 minutes. Wind speed and direction data are sampled at a rate of 1 Hz and subject to a rolling average, over a period of 2.5 minutes. Air temperature data are instantaneous readings every 10 minutes.

Graph showing live wind speed

Wind speed (click to zoom)

Graph showing live air temperature

Air temperature (click to zoom)

Graph showing live wind direction

Wind direction (click to zoom)

Tide Information

Tidal predictions are provided courtesy of the UK Hydrographic Office. Predictions are made for the timings of high and low water at St Ives and heights are shown in meters above Chart Datum.

Tides for St Ives (a secondary port) are calculated by applying time and height differences to predictions based on long term tide gauge observations at a selected standard port with similar tidal characteristics (in this case: Milford Haven).

  Low High Low High Low

19-11-2017

05:16 (6.505m)

11:38 (1.253m)

17:30 (6.423m)

23:54 (1.278m)

20-11-2017

05:46 (6.473m)

12:09 (1.316m)

18:02 (6.330m)

21-11-2017

00:27 (1.387m)

06:19 (6.377m)

12:44 (1.436m)

18:36 (6.178m)

It is important to note that the tide data displayed are predicted values. They do not take into account any meteorological effects which may be prevalent on the day in question. Such effects (such as wind and pressure) may significantly alter the observed tide from the predicted values. Predicted values are also sensitive to the quality of the standard port data and to local terrain and bathymetry changes and as such must always be used with caution.

Live Heave Data

(updated every 5 seconds)

Live vertical heave data is transmitted from the wave buoy at a rate of 1.28 Hz. A scrolling graph (updated every 5 seconds) showing the last 5 minutes of vertical heave data is displayed. The graph effectively allows real time waves to be observed in a graphical format, providing a useful visual overview of the prevailing wave conditions on site, including distribution of wave height and period.

These data are real time and not quality controlled. They are based on raw vertical heave data alone (as opposed to both vertical and horizontal components of heave) and should therefore be interpreted as indicative values and employed with caution.

24 hour Wave Data

Wave height, period and direction data are presented for the past 24 hours. The values presented are derived from the half-hourly spectral wave analysis. Graphical displays of wave conditions over the past 24 hours provide a useful insight into prevailing conditions on site, including whether wave heights are increasing or decreasing, whether swell or local wind waves prevail and whether wave direction is significantly changing.

Graph of wave height over a 24 hour period

Wave height (click to zoom)

Graph of wave period over a 24 hour period

Wave period (click to zoom)

Graph of wave direction over a 24 hour period

Wave direction (click to zoom)

Historical Data

All data collected by the wave buoy and meteorological station is archived and made available for download and re-analysis. For wave data, only spectrally derived half-hourly values are available, whereas for meteorological data, values are provided every 10 minutes. Some gaps in data may exist where radio telemetry is interrupted but best endeavours are made to back fill these gaps using data downloaded directly from the wave buoy at the six-monthly services.

Wave Hub Wave Data

Perranporth Weather Data