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Blackstones wave buoy observations on Tue, Aug 18, 2026

Hourly readings from the Blackstones wave buoy for Tue, Aug 18, 2026, including available wave height, period, direction, wind and sea temperature data.

Last observation shown

Oldest observation available

Daily means for

Latest

Period Summary

Programmatically generated summary. Hog Says

28 wave-buoy observations were recorded during the day. Typical wave height was 7.8 ft (10th–90th percentile 7.3–11.4 ft), while mean peak wave period was 9.5 seconds (10th–90th percentile 7.3–12 seconds). Mean water temperature was 15.1°C (10th–90th percentile 15–15.2°C). All 112 checked values passed quality control.

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

Line chart showing wave height, wave period and sea temperature for Blackstones. Use the detailed observations table below for the same data in text form.

About Blackstones wave buoy

Blackstones is a Cefas WaveNet directional Waverider operated with the Scottish Environment Protection Agency in exposed Atlantic waters south of Tiree. Its position provides an open-water reference for systems approaching the southern Hebrides and the Argyll coast.

Its current data source reports wave height, wave period, wave direction, directional spread and sea temperature.

Metrics are rows; hours run left to right. Times use your device time zone.
Blackstones wave buoy hourly observations Tue, Aug 18, 2026Last observation shown
Metric
Significant wave height (ft)--------------------8878777777778888999101011111212121111
Peak period (s)--------------------7777788888999910910910111013121213121312
Zero-crossing period (s)--------------------5555556566666666667777788888
Peak wave direction--------------------WSWWSWWSWWSWWSWWSWWSWWSWWWSWWWSWWWNWWNWWNWWWNWWWWWWNWWWWNWNWW
Directional spread (°)--------------------23.023.023.028.021.026.018.023.018.023.023.023.028.018.023.018.021.018.021.021.029.018.023.023.023.026.018.031.0
Water temperature(°C)--------------------15.115.115.115.115.115.215.315.315.114.914.914.915.115.115.115.115.215.215.215.215.315.215.115.115.115.115.115.1

Swipe sideways to see more hours.

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 Cefas WaveNet monitoring network.

Learn how SurfHog combines, checks and summarizes observations in the data and methodology notes.

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