Isobars are an interesting tool that weather forecasters use to determine atmospheric pressure. These bars show atmospheric pressures at a certain time and level. The distances between each isobar is equal. If isobars are very close together like the ones in the south of France are in this map, then there is going to be a low pressure system moving in, meaning there is going to be stormy weather. I choose this map because I took a Physical Geography class one semester and really enjoyed how to read these types of maps.
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