A map showing the state of the weather over a large area.
- When isobars on a weather chart are close together, it will be a blustery day.
- The lines on a weather chart are known as isobars and represent areas of equal pressure.
- All committed surfers can read an Atlantic weather chart and predict what the surf will be like days in advance, but if that's all too much trouble for you there are several websites and phone numbers you can dial up for a surf check.
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