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Published byJustin Thornton Modified over 9 years ago
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How can you Interpret a Weather Maps?
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Weather Maps are used to show the current state of the atmosphere and to forecast future conditions.
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Isolines connect points of equal MEASURMENTS. Isotherms connect points of equal TEMPERATURE Isobars connect points of equal PRESSURE
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Isotherms Isobars
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Pressure Gradient - Is the rate of change in air pressure. -The closer the isobars the greater the pressure gradient - The greater the pressure gradient the greater the wind speed.
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Isobars close together = high pressure gradient = fast wind speeds Isobars far apart = small pressure gradient = slow wind speeds
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Rules for Drawing Isolines 1.Isolines don’t cross each other! (Although sometimes they come very close together) 2. Isotherms should run east – west. (The higher the latitude, usually the colder the isotherm) 3. Isobars should make circles of high and low pressure
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Isoline Example: Isolines connect points of equal value, draw the line through the center of the number (or point) 15 55 55 10
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Isolines are gentle, curving lines; no sharp corners. (THESE ARE BAD CONTOUR LINES) 15 55 55 10
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Isolines NEVER cross - **this would mean that one point has two different values.** 20° 30 ° 40 ° 50 °60 ° XX YY ZZ The red line is WRONG The black lines are RIGHT
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Isolines usually are parallel. (They have a parallel trend.)
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Worksheet – “Isobars – Wind and Air Pressure”
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