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Isobars and Air Pressure Eric Angat Teacher. Isobars line of constant pressure

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Presentation on theme: "Isobars and Air Pressure Eric Angat Teacher. Isobars line of constant pressure"— Presentation transcript:

1 Isobars and Air Pressure Eric Angat Teacher

2 Isobars line of constant pressure

3 Isobars line of constant pressure What is the direction of the wind? L ow pressure means bad weather. The wind rotates COUNTERCLOCKWISE. H igh pressure means good weather. The wind rotates CLOCKWISE.

4 Air Pressure Explained! 1.What happens to the density of air as we go higher up in the atmosphere? 2.When does air contract? 3.When does air expand? 4.What is a barometer? 5.What does it mean by low pressure (L)? 6.What does it mean by high pressure (H)?

5 Air Pressure Explained! https://www.youtube.com/watch?v=jmQ8FWnM0fA

6 Air Pressure Explained! 1. What happens to the density of air as we go higher up in the atmosphere? 2. When does air contract? 3. When does air expand? 4. What is a barometer? 5. What does it mean by low pressure (L)? 6. What does it mean by high pressure (H)? The density of air decreases because of lower air pressure. Air contracts when it is cooled. Air expands when it is heated. Barometer is an instrument that measures air pressure. Low pressure means bad weather and precipitation. High pressure means good weather.

7 Isobar Contours 7. What is the average atmospheric pressure? 8.What are low pressures? 9.What are high pressures? 10. What is the interval between isobars? 11.Which states have bad weather? 12. What do you notice about the distances between isobars in areas of low pressure compared to the area of high pressure?

8 Isobar Contours

9 Isobar Contours 7. What is the average atmospheric pressure? 8.What are low pressures? 9.What are high pressures? 10. What is the interval between isobars? 11.Which states have bad weather? 12. What do you notice about the distances between isobars in areas of low pressure compared to the area of high pressure? 1013 millibars Lower than 1013 millibars is low pressure. Higher than 1013 millibars is high pressure. Interval is 4 millibars Arizona and Tennessee Isobars in low pressure areas are closer to each other while isobars of high pressure areas are farther away from each other.

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11 13. How do I draw Isobars arwoodr/GEOL101/Labs/Wind/index.htm

12 Isobars are lines of constant pressures. Isobars have intervals of 4 mb

13 Isobars are lines of constant pressures. Find the lowest air pressure that has an interval of 4.

14 Isobars have intervals of 4 mb. Connect the isobars starting from 1024 mb mb 1028 mb 1032 mb 1036 mb windy Not windy

15 Isobars are lines of constant pressures.

16 13. How do I draw Isobars Isobar lines are drawn across equal air pressures with interval of 4 millibars. When isobars are close to each other, it is windy. When isobars are farther away from each other there is light wind.

17 Predict the Weather 14. What are isobars? 15. What kind of wind is present when isobars are close together? 16. What kind of wind is present when isobars are wider apart from one another? 17. Why do we need to know the direction of the wind when predicting the weather? Think!

18 Predict the Weather

19 Predict the Weather 14. What are isobars? 15. What kind of wind is present when isobars are close together? 16. What kind of wind is present when isobars are wider apart from one another? 17. Why do we need to know the direction of the wind when predicting the weather? Think! Isobars are lines of constant pressures. Wind is strong. Wind is light. So that we can predict the direction of the front.

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21 18. Using the weather map, identify the air pressure in the following states.

22 H L

23 KEY: a. California __1016__________ b. Nevada _____1020______________________ c. Utah, Wyoming, Colorado ______1024______ d. North Carolina _______1012_____________ e. Indiana, Ohio, Kentucky ______1008________ f. Wisconsin _________1012________________ 19. Which states are experiencing good weather? ______ Utah, Wyoming, Colorado _________ 20. Which states are experiencing bad weather? ____ Indiana, Ohio, Kentucky ______

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