Weather Patterns and Predictions Part 1

SES5.c Construct an argument that predicts weather patterns based on interactions among ocean currents, air masses, and topography.

• I can identify patterns in ocean currents, air masses, and topography. (Knowledge)

• I can explain weather patterns based on interactions among ocean currents, air masses, and topography. (Reasoning)

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​Air Mass

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Fronts

​Air Pressure

​Air Pressure, Barometric pressure, is the measure of the force exerted in all directions by the air.

​It is directly affected by the density of the air.

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​Two factors that affect air density:

​TEMPERATURE

​MOISTURE (Humidity)

​More Dense=Greater Pressure

​Less Dense=Less Pressure

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​Warm Air=Less Dense

​Cool Air=More Dense

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​Dry Air=More Dense

​Moist (Humid) Air=Less Dense

​When the temperature changes, it causes a difference in pressure. This forces dense cool air (over water) to sink and move along the ground. When that happens it pushes the warmer air upward.

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​Air moves from a region of high pressure (cool air over water) to low pressure (warm air over land).

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​Changes in air pressure also cause changes in weather conditions .

​Topographic Maps are marked with contured lines...ISOBARS.

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The Isobars are used to depict air pressure.

​H represents highest pressure (cool, dry)

​L represents lowest pressure (warm, humid)

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​Remember!!!

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​Air moves from a region of high pressure (cool air over water) to low pressure (warm air over land).

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