Nodules on CT scan (3 replies): I had a CT scan ran twice on my lungs. It shows multipl... [more]. Ground glass opacities. Hi, Just got the CT scan result back. A 7mmx4mm gro... [more]. Continue discussion. This discussion is closed.
Isobars are lines of constant or equal pressure on a weather map. They can be used to find areas of low or high pressure over a broad area (like the U.S.), and they can tell us how intense the system may be.
Symbols on the map. 1  Thin black lines: These are isobars. 2  Arrows: Direction of the wind (wind speed is shown in miles per hour) 3  Numbers in black circles: Air temperature in degree Celsius (degree Fahrenheit is shown in brackets) 4  Icons: Show main weather features such as light cloud, rain, sunshine, etc.