A bar is a metric unit of pressure and isobars are lines on a weather map that connect points of equal air pressure. Because variations in air pressure drive atmospheric winds, isobars give ...

Using isobars on weather maps is completely accurate. Wind derives its initial speed and direction from changes in air pressure over distance, or pressure gradient force (PGF). This is why when ...

Isobars are lines/areas of equal pressure represented on a weather map. When isobars become very tightly grouped together it indicates a "tight pressure gradient" (steep slope). The tightly packed ...

Paris Alston: This is GBH’s Morning Edition. When trying to make sense of the weather and meteorological patterns, there are a lot of helpful tools out there. One of them is isobars, the curved lines ...

An isobar is a line of constant pressure. These lines are often measured in 2, 4, or 10 millibar increments. When you see lots of isobars over an area, most likely that area is experiencing lots of ...