Peak wind vs minimum pressure, era by era

Pressure Lens

Why Do Wind and Pressure Go Together?

Meteorologists watch a hurricane's minimum pressure almost as closely as its wind speed -- and there is a real physical reason the two move together.

Air always flows from high pressure toward low pressure, trying to even things out -- the same reason air rushes out of a punctured tire. A hurricane's center is an intense pocket of low pressure, so air comes rushing in to fill it. But because the whole system is spinning, that inrushing air does not just fill the hole -- it gets whipped around into rotation instead, the same way water spinning down a drain speeds up as it gets pulled toward the center. The lower the pressure at the center, the harder that pull, and the faster the resulting winds.

Here is the part that makes this page interesting, though: pressure and wind are not a perfect match. Picture two storms with the exact same minimum pressure -- one is small and tightly wound, the other is big and loose. The tight one is like a narrow, steep bowl: all that pressure difference is squeezed into a small area, so the air gets slung around violently. The loose one is like a wide, shallow bowl: the same pressure drop is spread over a much bigger area, so the winds it produces are comparatively tame.

That is exactly what this page measures. A storm that is more compact than typical spins up faster winds than its pressure alone would suggest -- Wilma (2005) is the extreme real example, an astonishing 882mb paired with 160kt winds, far more intense than a storm with that pressure "should" be. A storm that is more sprawling than typical does the opposite: strong-sounding pressure, but the winds do not quite catch up. Neither one is more dangerous -- compact and sprawling storms threaten people in very different ways -- but this is the size/structure signature that pressure-alone or wind-alone would miss.

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Every Storm, Plotted

Each dot below is one real storm: its peak wind on one axis, its minimum pressure on the other. The colored lines are this site's own typical wind-pressure relationship, fit separately for each era of the historical record. A storm sitting right on its era's line is behaving exactly as expected for its wind; a storm sitting far above or below the line is the interesting one -- notice how Wilma sits well above the modern-era line, far more intense (lower pressure) than a typical storm with 160kt winds.

Explore pressure zone by zone in the Zone Lab tool

Storms, Most to Least Divergent

Negative = deeper pressure than the era's fit predicts for that wind (compact/intense for its wind). Positive = shallower (large/sprawling for its wind). Storms missing wind or pressure, or in an era with no fit, show as insufficient data rather than being silently dropped from the list.

Download the full dataset as CSV for wind, pressure, and every other field behind this page.