An Introduction to Physical Geography

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Presentation transcript:

An Introduction to Physical Geography Chapter 8 Weather Geosystems 6e An Introduction to Physical Geography Robert W. Christopherson Charles E. Thomsen

Weather Air Masses Atmospheric Lifting Mechanisms Fronts

Air Masses Figure 8.2

Lake Effect Snowbelts Figure 8.5

Atmospheric Lifting Mechanisms Convergent Lifting Convectional Lifting Orographic Lifting Frontal Lifting (Cold and Warm Fronts)

Atmospheric Lifting Mechanisms Figure 8.6

Figure 6.11

Local Heating and Convection Figure 8.7

Convection over Florida Figure 8.8

Orographic Precipitation Figure 8.9

Orographic Patterns Figure 8.10

Frontal Lifting Fronts: named after attacking air mass Remember: cold air is denser, heavier Cold Fronts Cold air forces warm air aloft 400 km wide (250 mi) Warm Fronts Warm air moves up and over cold air 1000 km wide (600 mi)

Frontal Lifting Both cold and warm fronts cause air to be uplifted. This causes adiabatic cooling, low pressure, cloud development, rainfall. Keep in mind the properties of each type of air mass and their changes as the front passes.

Frontal Lifting The BIG FIVE! Know how these change: Humidity Temperature Pressure Wind direction/speed Cloud types Cold front: blue triangles Warm front: red/orange half circles

Cold Front Figure 8.11

Cold Front and Squall Line

Warm Front Figure 8.13