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Drawing Isobars:

Drawing Isobars:. Isobars are lines drawn to connect identical values shown on maps…. Drawing Isobars:. In meteorology, isobars are used to connect points of equal atmospheric pressure…. Drawing Isobars:.

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Drawing Isobars:

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  1. Drawing Isobars: Isobars are lines drawn to connect identical values shown on maps…

  2. Drawing Isobars: In meteorology, isobars are used to connect points of equal atmospheric pressure…

  3. Drawing Isobars: This information will graphically depict weather phenomena that can be used in forecasting…

  4. Drawing Isobars: Let’s begin by using the blank Weather Forecasting Review Worksheet…

  5. Drawing Isobars: Using a pencil, you will lightly draw lines connecting identical values of sea level pressure.

  6. Drawing Isobars: Isobar lines do not cross each other.

  7. Drawing Isobars: Isobars are usually drawn for every four millibars using 1000 millibars as your starting point.

  8. Drawing Isobars: Therefore, these lines should have values of 1000, 1004, 1008, 1012, 106,etc., or 996, 992, 988, 984, etc.,

  9. Drawing Isobars: Begin drawing from 1024 millibars station pressure over Salt Lake City…

  10. Drawing Isobars: Draw a line to the next 1024 value located to the NE as shown..

  11. Drawing Isobars: Without lifting your pencil from the paper, continue drawing a line connecting the 1024 values located in the SE and SW

  12. Drawing Isobars: Repeat the procedure for the next isobar value of 1020

  13. Drawing Isobars: Repeat the procedure for the next isobar value of 1016

  14. Drawing Isobars: Repeat the procedure for the next isobar value of 1016

  15. Drawing Isobars: Repeat the procedure for the next isobar value of 1012

  16. Drawing Isobars: Repeat the procedure for the next isobar value of 1008

  17. Drawing Isobars: Repeat the procedure for the next isobar value of 1008

  18. Drawing Isobars: Your finished drawing should look something like this:

  19. Drawing Isobars: These isobars can be used to identify ‘High’ and ‘Low’ pressure systems… A B Which of these systems is a ‘High’ pressure system?

  20. Drawing Isobars: A is a high pressure system A

  21. Drawing Isobars: Draw a large ‘H’ in the center of the high pressure system as shown H

  22. Drawing Isobars: In a high pressure system, winds revolve around it in a clockwise direction… H

  23. High Pressure Systems In high pressure systems, wind direction is created by the sinking of cooler, drier air…

  24. Drawing Isobars: B refers to a ‘low’ pressure system B H L

  25. Drawing Isobars: In a low pressure system, winds revolve around it in a counter-clockwise direction… B H L

  26. Drawing Isobars: In most cases, these air pressure systems move in a west to east direction… H L

  27. Low Pressure Systems In low pressure systems, wind direction is created by the rising of warm, moist air…

  28. Drawing Isobars: If we ignore the numbers, this is how the map might look after 24 hours… L H

  29. Drawing Isobars: This information will graphically depict weather phenomena that can be used in forecasting…

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