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.
Weather Maps and Symbols. On any given day, there's plenty of activity on a weather map. Frontal boundaries and the Highs and Lows are the prominent features on an average weather map you might see on the TV news. Let's take a closer look at what they mean. Cold Front. A blue line with points indicating the direction of movement.