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Sandown Bay wave buoy daily means for Jan 2019

Daily means from the Sandown Bay wave buoy for Jan 2019, 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

1,487 wave-buoy observations covered all 31 days. Typical wave height was 1 ft (10th–90th percentile 0.5–2.7 ft), while mean average of more than one wave period type was 6.4 seconds (10th–90th percentile 3.7–12.2 seconds). Mean water temperature was 8.6°C (10th–90th percentile 7.8–9.4°C). 23 of 5,811 checked values (0.4%) were excluded by quality control. Across 9 comparable years, mean wave height was below the same-month mean of 2.2 ft and mean wave period was below the same-month mean of 6.6 seconds.

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

Typical Significant Wave Height

1ft
Mean: 1.3 ft
P10–P90: 0.5 — 2.7 ft
Recorded extremes

0.3 — 9.2 ft

Available for 743 of 744 hourly samples

Mean Observed Wave Period

6.4secs
P10–P90: 3.7 — 12.2secs
Recorded extremes

1.7 — 22.2secs

Available for 739 of 744 hourly samples

Observed Wave Direction

SSE

Circular concentration: 79%

Mean Water Temperature

8.6°C
P10–P90: 7.8 — 9.4°C
Recorded extremes

7 — 9.7°C

Available for 716 of 744 hourly samples

Compared With Previous Januarys

Historical baseline from 13,377 observations across 9 years.

Wave Height
1.3ft
0.9ft below mean
Historical mean 2.231ft
Wave Period
6.4s
0.2s below mean
Historical mean 6.6s
Water Temperature
8.6°C
0.2°C above mean
Historical mean 8.4°C

Chart showing grouped wave observations for Sandown Bay. 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 Sandown Bay wave buoy

Sandown Bay is a Channel Coastal Observatory National Network wave station off the east coast of the Isle of Wight. Its nearshore record represents conditions entering the bay between Culver Down and Dunnose, helping monitor a developed and erosion-sensitive frontage exposed to English Channel seas.

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

Metrics are rows; days run left to right.
Sandown Bay wave buoy daily means Jan 2019Last observation shown
Metric
Mean significant wave height (ft)111101111111211313411211122111QC rejected
Mean maximum wave height (ft)1211111211122214246223211332227
Mean peak period (s)11444714967555666675644611766107566
Mean zero-crossing period (s)4333444444334434444335444445454
Mean energy period (s)-------------------------------
Mean wave power, kilowatts per metre-------------------------------
Mean peak wave directionSconcentration 73%SEconcentration 88%SEconcentration 72%ESEconcentration 54%SSEconcentration 93%Sconcentration 99%Sconcentration 97%Sconcentration 100%SEconcentration 50%ESEconcentration 52%SSEconcentration 88%Sconcentration 97%Sconcentration 100%Sconcentration 99%Sconcentration 98%Sconcentration 99%Sconcentration 85%SSEconcentration 92%SEconcentration 96%ESEconcentration 80%SSEconcentration 72%SSEconcentration 91%SSEconcentration 58%Sconcentration 86%Sconcentration 99%Sconcentration 99%Sconcentration 86%SSEconcentration 70%SSEconcentration 93%Sconcentration 92%SEconcentration 92%
Mean directional spread (°)34.030.730.836.833.939.729.025.738.333.837.725.025.125.323.319.429.325.022.030.630.224.938.431.527.522.832.833.129.230.724.3
Mean water temperature(°C)9.79.59.39.39.39.49.49.38.98.58.68.78.98.98.98.98.88.68.48.38.28.28.17.98.08.08.07.87.87.57.3

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 Regional Coastal Monitoring Programme.

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

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