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    Avalon Offshore Swell Height and Direction:

    To change the Avalon swell forecast between metres and feet click the 'height' link on the top right of the graph. WillyWeather will remember your selection for the next time you visit. You may navigate to different dates with the left and right arrows, or by using the 'jump to date' button on the bottom right of the graph. To find the closest swell locations to Avalon, see the 'closest locations' link and the map in the sidebar to the right.
    Swell Heights
    In the Avalon swell forecast graph, swell heights refer to the average of the highest one-third of swell waves (for height descriptions please see the key at the bottom right of the graph). Not every wave will be the same height, some will be higher and some will be lower. To give an indication, roughly 1 in 10 waves will be higher than the level indicated, 1 in 100 will be more than 50% higher, and 1 in 1000 will be roughly twice as high. The same rough ratio applies for waves that are lower than the level indicated. Please see the key associated with the graph beneath this one for detailed descriptions on swell heights.
    The Data
    WillyWeather sources its Avalon surf forecast information from the National Oceanic and Atmospheric Administration. The NOAA is the US Government agency that forecasts global weather, similar to the Bureau of Meteorology but many times larger. Avalon surf reports are updated every 6 hours. To see when the last swell forecast was issued and when the next swell forecast will be issued, please see the text beneath the graph.
    Note: For information on swell period please see the line graph below and refer to the help button associated with that graph.
    Avalon swell forecast issued today at: 2:41pm / Next forecast tomorrow around: 2:41pm
    Swell forecast times have been adjusted for daylight saving where and when applicable

    Avalon Swell Report - Offshore Period, Height and Direction:

    This graph shows swell height and direction in more detail, and introduces swell period. The line with the arrows shows swell height and direction, while the dotted line shows swell period in seconds. Move your mouse over the graph to find exact values.
    What is Swell Period?
    Swell period tells us the approximate distance between swell waves. It is defined as the amount of time it takes for two consecutive wave crests to pass a stationary point.
    How can Swell Period be Used?
    Swell period can be used to help to determine onshore wave heights. A longer period results in a more powerful wave, forming a higher face than swell of a similar height but with a shorter period. The exact height and quality of the waves at Avalon will also depend on the contour of the seabed, wind speed and direction.
    Note: Please see the help button associated with the graph at the top of the page for instructions on how to use the graphs, as well as information on how to interpret the swell data. Data sources are listed below the graph.
    Chart Key
    0 - 0.1 m 0.1 - 0.5 m 0.5 - 1.3 m
    1.3 - 2.5 m 2.5 - 4 m 4 - 6 m
    6 - 9 m 9 - 14 m > 14 m


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