Weather charts, also known as surface pressure or synoptic charts, provide useful information on weather and sea conditions. Safe Skipper’s Simon Jollands recommends to mariners to always study weather charts and estimate how the weather is likely to evolve in the area they plan to sail in.
Credit: Met Office
The circular lines, similar to contour lines on a land map, are isobars and join areas of equal barometric pressure.
Air moves from high to low pressure; when the difference in the pressure...
https://safety4sea.com/predicting-wind-direction-and-strength-by-reading-a-weather-chart/