The Atlantic

Don’t Pay Attention to the Hurricane Category

The wind-based metric doesn’t fully capture what’s most dangerous about storms like Florence.
Source: NOAA

On Wednesday, Hurricane Florence weakened to a Category 3 storm, and then again to a Category 2. Simultaneously, meteorologists warned that Florence looked even more dangerous than it did before.

How can a storm weaken and also look more life-threatening?

The answer lies in the “hurricane category” system, and how it can distort the most important information about a tropical cyclone.

As a storm bears down on the coast, just about everyone—except, perhaps, veteran meteorologists—tends to fixate on its category. Most people know that the bigger the category, the scarier and more notable a storm.

That rule of thumb has the benefit of to strike the East Coast north of Florida. Only 33 Category 5 storms in the Atlantic Ocean, and as President Donald Trump last year: “I never even knew a Category 5 existed.”

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