This is a cross section of the thunderstorms seen in the previous 1703 UTC image.  Note the tilted updrafts and the storm tops are only up to about 25,000 feet.  The storm updrafts are tilted because of the speed shear that is present below 10,000 feet.  In tropical systems, the strongest winds are at low levels and become weaker with height, so the base of the thunderstorm can "outrun" the top of the thunderstorm.  The strong winds at low levels also can contribute to tornado formation, through processes too complex to be described here.

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