<ul data-eligibleForWebStory="false"><li>Wave sensors track significant wave height (Hs) in open seas and ports to identify extreme events.</li><li>In signal processing, energy of a continuous-time complex signal x(t) is computed as the area under the square of the function.</li><li>For discrete values of x(t), the energy calculation transitions to the concept of the 2-norm or Euclidean norm for Hs values.</li><li>The Storm Power Index (SPI), introduced in 2015 by Pushpa Dissanayake, measures a storm's strength by squaring wave heights over time.</li></ul>

When does a regular waves become a “Storm” — and how much energy do they pack?

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