Chapter12a - Middle-Latitude Cyclones I RECAP Types of Fr...

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Unformatted text preview: Middle-Latitude Cyclones - I RECAP: Types of Fr onts • Cold fr onts : cold, dry stable air is replacing warm, moist unstable air. Moves fast, showers along the leading edge (squall line). • War m fonts : warm, moist unstable air is replacing cold dry stable air. Overrunning: warm air rides up and over the cold air, widespread cloudiness, light-to-moderate precipitation well ahead of the front • Stationar y fr onts : essentially no movement, winds blow parallel to the front, in opposite directions on both sides • Occluded fr onts: when a cold front catches up with a warm front (more later) • The symbols on a map are in the direction of the air mass motion. Formation of an occluded front Cold occlusion Weather Map • Shown: surface-pressure systems, air masses, fronts, isobars, winds and air flow (large arrows) • Green-shaded area: precipitation Weather Map • The example from Chapter 1: Fig. 1.14. Sample weather maps...
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Chapter12a - Middle-Latitude Cyclones I RECAP Types of Fr...

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