A tropical storm is building strength some...

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Question 1 of 2066636ee728f7522a1c518d00

A tropical storm is building strength some distance from your MODU. Waves are coming from the east, with periods increasing from 5 seconds to 15 seconds. The swell is from the east. Where was the storm when these new swells were generated?

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Question 1 of 20

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🔍 Key Concepts

• Wave trains and swell direction – Swell generally travels in the same direction it is moving when it reaches you • Relationship between source (storm) and wave approach – Think about where the storm must be located to produce swell that arrives from the east • Deep-water swell travel – Long-period swells can travel great distances in straight lines from the generating storm

💭 Think About

• If the swell is coming from the east toward your position, in which general direction from you must the storm have been when it generated those swells? • Imagine looking at a chart with north at the top. If waves are approaching your MODU from the east, how would you draw an arrow to show the direction they are traveling? Where on that line would the storm be located? • How does the phrase ‘the swell is from the east’ relate to the direction those waves are moving relative to your position?

✅ Before You Answer

• Confirm what ‘swell from the east’ means in terms of the direction waves are traveling relative to your position • Visualize or sketch a simple compass rose and draw the wave approach direction to see what side of your position the storm must be on • Remember that swells radiate outward from the storm center in roughly straight lines—trace that line back from your position to locate the storm’s general bearing

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