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Super Typhoon Bavi may already be completing her eyewall replacement cycle. What was just a few hours ago a ragged, imperfect CDO is suddenly circularizing into a symmetrical ring of pure convective ice, forcing renewed subsidence down through the eye. Core temperatures have risen to -15.76 C and are...

55,621 views • 15 days ago •via X (Twitter)

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LOOK AT THESE! You've probably never heard of "mesovortices," but the eyes of major/intensifying hurricanes, like Category 5 Melissa, actually contain addition, smaller whirls a few miles across. Mesovortices are a few miles across; they form as a way to balance an extreme discontinuity in angular momentum. In the buzzsaw-like eyewall – that ring of winds spiraling around the eye – there's an incredible amount of extreme wind and "angular momentum." But in the eye, there's hardly any – the air is calm. That means the eyewall "chafes" against the calm eye. Since the atmosphere is a fluid, that chafing pinches off into eddies and vortices. Think about when you're kayaking or canoeing through a pond. You might notice a few whirlpools shedding off your oar as the moving oar sweeps through the stationary water. A similar premise exists here. In this case, the atmosphere handles the transition from the eyewall to the eye by having some of the fluid "curl back" on itself, forming 4, 5 to 6 smaller "mesovortices." This eye exhibited a "wavenumber 5" pattern, meaning there were five mesovortices. The mesovortices often contort the inner edge of the eyewall into a wonky "sawtooth" pattern. That means that, if you stand right near the interface, you'd have about 5 minutes of "in... out... in... out" where, despite being basically in the eye, ebbs of the eyewall could still swing through and bring you a sudden, extreme gust. Welcome to the magic of fluid dynamics in the atmosphere.

MyRadar Weather

198,950 views • 8 months ago