Isobars are lines of equal atmospheric pressure on a weather map. The red L indicate areas of low pressure and the blue H present areas of high pressure. The isobars are the lines circling them. Generally wind flow from areas of high pressure to low, so meteorologists uses this to predict future forecasts. Low pressure has increase chances of precipitation whereas high pressures is associated with clear conditions. The closer the isobars are together, the more wind is to be expected. Any elongated areas in low and high pressures are "troughs" and "ridges."
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