đ Key Concepts
⢠Tropical waves in the Northern Hemisphere and which way they normally move across the Atlantic
⢠The general trade wind direction between the equator and about 30°N
⢠The difference between ânearbyâ, âfarther awayâ, and âsame positionâ over a 12âhour period at typical wave speeds
đ Think About
⢠If a tropical wave is east of you, and the trades are blowing from east to west, how will its position relative to you change over time?
⢠In 12 hours, would you expect a slowâmoving tropical feature to cover a noticeable distance, or stay almost fixed?
⢠Think about whether the wave will move closer to your longitude, farther away, or pass to the other side of you.
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Before You Answer
⢠Confirm the typical direction of movement of tropical waves in the Northern Hemisphere Atlantic (with the trades).
⢠Estimate a reasonable travel distance in 12 hours if the wave moves at, say, 10â20 knots.
⢠Decide whether, after moving, the wave would be still east of you, directly over you, or to your west.