How is strong pressure gradient represented on a weather map?

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CDS-II (General Knowledge) Official Paper (Held On: 01 Sept, 2024)
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  1. Closely spaced isobars
  2. Widely spaced isobars
  3. Closely spaced isobars at the periphery
  4. A set of two widely spaced isobars followed by two closely spaced isobars

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Option 1 : Closely spaced isobars
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The correct answer is  Closely spaced isobars.

Key PointsRepresentation of Strong Pressure Gradient on a Weather Map

  • Isobars are lines on a weather map that connect points of equal atmospheric pressure.
  • A pressure gradient refers to the rate of change of atmospheric pressure over a certain distance.
  • Closely spaced isobars indicate a strong pressure gradient, meaning there is a rapid change in pressure over a short distance.
  • This strong pressure gradient often leads to strong winds, as air moves from areas of high pressure to areas of low pressure.
  • In contrast, widely spaced isobars signify a weak pressure gradient, resulting in lighter winds.
  • Understanding isobar spacing is crucial for meteorologists to predict wind speeds and weather patterns.
  • The concept of isobars and pressure gradients is fundamental in weather forecasting and aviation.

Additional Information

  • Isobars and Weather Prediction: Meteorologists rely on isobar patterns to predict weather conditions. For example, tightly packed isobars can indicate storms or high wind speeds.
  • Wind Direction and Isobars: Winds generally blow parallel to isobars due to the Coriolis effect, but they cross isobars at an angle towards lower pressure in surface weather maps due to friction.
  • High and Low-Pressure Systems: High-pressure systems (anticyclones) are usually associated with fair weather, while low-pressure systems (cyclones) can bring storms and precipitation.
  • Weather Map Interpretation: Understanding the patterns and spacing of isobars helps in interpreting weather maps accurately, which is essential for various applications, including agriculture, aviation, and daily weather forecasting.
  • Historical Context: The use of isobars in weather mapping dates back to the 19th century, significantly improving the accuracy of weather predictions.
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