Isobars and isotherms are lines on weather maps which represent patterns of pressure and temperature, respectively. They show how temperature and pressure are changing over space and so help describe the large-scale weather patterns across a region in the map. Isobars are lines of constant or equal pressure on a weather map. On surface maps, isobars represent stational pressure readings reduced to sea level to eliminate the effects of the different heights of the reporting stations. Above, isobars are used to show sea-level pressure from low and week to high.Generally the lowest pressure is where precipitation is most likely to fall, and high pressures are usually associated with clear and sunny conditions. Where the isobars are close together, windy conditions may be expected. Elongated areas of low pressure on surface and upper air weather maps are called "troughs" and elongated areas of high pressure are called "ridges."
No comments:
Post a Comment