The best I could find with some research was the Dvorak Technique used to measure cyclone intensity from visible and infrared images.
Also from Wikipedia:
While typical mature storms have eyes that are a few dozen miles across, rapidly intensifyingstorms can develop an extremely small, clear, and circular eye, sometimes referred to as a pinhole eye. Storms with pinhole eyes are prone to large fluctuations in intensity, and provide difficulties and frustrations for forecasters.[7]
Lastly I would guess it has to do with plain angular momentum. A cyclone that contracts will spin faster, if angular momentum is constant, in the same way that a figure skater speeds up when they tuck in their arms.
The smaller the eye, the stronger the wind?
relatable
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The best I could find with some research was the Dvorak Technique used to measure cyclone intensity from visible and infrared images.
Also from Wikipedia:
Lastly I would guess it has to do with plain angular momentum. A cyclone that contracts will spin faster, if angular momentum is constant, in the same way that a figure skater speeds up when they tuck in their arms.