Those three show an isobar for every 1 ... and 1 millibar just results in way too many lines on the map.

isobars on weather maps are important. Variations in air pressure drive the winds on earth, and isobars–lines of equal pressure–offer an easy way for meteorologists to assess wind direction ...

So it’s you see the isobar lines close together along with an ‘L’ expect it to be rainy and windy. On a weather map (synoptic chart), a low is denoted by an ‘L’ with the central pressure ...

Most weather maps are dedicated to showing us only one ... it’s usually easy to spot these features using isobars—lines drawn on a map that connect areas experiencing equally high or ...

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 ...

Hourly weather observations that include sea-level pressure readings are plotted or printed on weather maps that meteorologists can analyze. Isobars are drawn by connecting points having equal sea ...

Save guides, add subjects and pick up where you left off with your BBC account. Isobars are lines on a weather map joining together places of equal atmospheric pressure. On the map the isobar ...