source : yahoo.com
Why do closely spaced isobars indicate strong winds and widely spaced isobars indicate weak winds?
This has to do with the pressure gradient force PGF. the equation for PGF = -1/ density constant * a change in pressure/ a change in distance. Because each isobar represents a change in pressure, the closer they are together, the greater the change in pressure (numerator) if the distance is kept constant (denominator), a tighter gradient will result in a larger PGF.
If you dislike the math, another good way to visualize this a topographical map. Each contour represents a change in height. the closer the contours, the steeper the cliff.
Remember: all areas along the same isobar have the same atmospheric pressure.
The PGF is not the wind itself, however it is a huge factor in determining wind velocity. It is okay to say that since the PGF is large, the winds will be stronger or vice versa, but do realize there are other forces (friction, centrifugal force and Coriolis force), at work here which result in the actual wind velocity.
Source(s): University student, studying meteorology.
PDF Memo | PART A – ISOBARS, PRESSURE AND WIND – Where the isobars are more widely spaced, near an anticyclone for example, they indicate light winds. Anticyclones An anticyclone, also known as a 'high' can be identified on a weather chart as an often large area of widely spaced isobars, where pressure is higher than surrounding areas.2. Widely spaced isobars indicate a high pressure gradient and high wind speeds. 3. The pressure gradient force acts parallel to the isobars. Which of the statements given above is/are correct?Widely spaced isobars often indicte. If the barometer indicated 1020 millibars, air pressure would be considered high.
Wizard IAS – Заметки | Facebook – Explain why on a map, closely spaced isobars (or contours) indicate strong winds, and widely spaced isobars (or contour lines) indicate weak winds.Translations in context of "widely spaced" in English-Russian from Reverso Context: But those environments are going to be widely spaced in this universe. Translation of "widely spaced" in Russian.Closely spaced isobars indicate large pressure changes over a small area and suggest strengthening winds. Isobars indicate gradient in air pressure. Air flows from areas of high pressure to areas of low pressure.
AIR PRESSURE AND WIND – CHAPTER 13… | Easy Notecards – They indicate that wind speeds will be high. • Widely spaced isobars indicate gentle wind . A low-pressure area usually has clouds and precipitation. • Storms and rain often follow a drop in air pressure . • When the barometer reading drops suddenly ,it is likely that precipitation will fall .The close spacing of pressure isobars would mean there is a steep pressure gradient of air. This is similar to the gradient lines on a contour map; the closer the lines are together, the steeper the gradient of the land. Using this same analogy, imagine we roll a ball down a gentle slope versus a steep slope.Copyright 2012 Pearson Education, Inc. 9) Closely spaced isobars often indicate _. 74) Why are coastal and mountainous regions often much more windy than other locations at similar latitudes? Also, from this and earlier chapters on meteorology, are there other weather characteristics…