How to read weather fax chart and wave forecast chart

The wave forecast chart in the weather facsimile chart is a chart used to predict ocean wave conditions. To interpret a graph like this one requires some basic knowledge about ocean waves.

Wave forecast maps usually include information such as contours, significant wave heights, and main wave directions. Contours are contour lines that represent ocean fluctuations, and their numerical values ??represent the height of waves. The effective wave height is the standard deviation of the height of the waves reaching the coast within a certain period of time, which reflects the energy of the waves. The main wave direction indicates the dominant direction of wind and waves.

When interpreting wave forecast charts, you need to pay attention to the following points:

1. Observe the density of contour lines, which reflects the period and frequency of waves. The denser the contours, the shorter the wave period and the higher the frequency, and vice versa.

2. Observe the shape of the contours, which reflect the shape of the waves. For example, circular or elliptical contours indicate gentle waves, while long or zigzag contours indicate steeper waves.

3. Combine wind direction and wind force information to analyze the wave forecast. Generally speaking, wind direction and force are the main factors affecting waves. If the wind direction and force are consistent with the main wave direction, the waves will be more intense.

4. Analyze the wave situation in combination with other factors of the marine environment, such as tides, seabed topography, seawater temperature, etc. These factors all affect the shape and energy of waves.

It should be noted that the wave forecast map is only a reference tool, and the actual wave conditions may be affected by many unpredictable factors, such as sudden changes in wind direction, changes in seafloor topography, etc. Therefore, when doing maritime activities, you must always pay attention to changes in weather and sea conditions to ensure safety.