how strong a tornado has to be to become a tropical named storm and start deep convection? when does it get an eye? how deep is the mesocyclon?

when it gets to water, it becomes a water sprout, but when they start to issue hurricane warnings, how string has the water sprout to be to develop an eye and become a named storm

conversely, what processes cause hurricane to degenerate into simple single mesocyclonic tornado when they touch land

do hurricanes retain their names once they become a simple tornado and become extratropical

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