Isobars are lines of equal pressure that surround a low-pressure system, and the more isobars there are and the closer they are together, the stronger the gradient and the stronger the winds will be.

The low pressure of a depressions causes clouds and rainfall to form. Depressions therefore bring unsettled weather and rain. Winds are normally stronger, shown by the isobars being closer together.

while the isobar marked 976 represents an area of low pressure. Not only do isobars tell us whether there is high or low pressure but they also tell us about wind: When the isobars are closer ...

There are H’s and L’s that represent highs and lows, and there are lines that resemble isobars. However, those H’s and L’s are not marking the position of high and low pressure centers ...