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Cold Front <strong>Wea<strong>the</strong>r</strong> Sequence• Winds steady from SW• Altocumulus (Ac) clouds (mid-levelpuffy clouds) on W or NW horizon• Barometer pressure falls• Clouds progressively lower andthicken• Cumulonimbus (Cb) clouds orThunderheads <strong>for</strong>m• Symbol to mark <strong>the</strong> boundary of <strong>the</strong>front is a line with blue triangles(cold air is behind <strong>the</strong> line)Cold front symbol
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