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Published on Jul 3, 2010
Level 2 base reflectivity radar loop of Hurricane Alex from the lowest tilt of the KBRO (Brownsville, Texas) site. The loop runs from 1004UTC on June 30, 2010 to 0857UTC on July 1, 2010 and shows Hurricane Alex making landfall over northeastern Mexico, near Soto La Marina and Campo Pesquero Enramadas and then moving west-southwest across the state of Tamaulipas. The loop includes a volumized 3D view of the hurricane's base reflectivity. The color table highlights reflectivity values of 25 DBZ or greater.
For a portion of this loop the hurricane's radar presentation displays a double eyewall structure with a distinct "moat" delineating the inner and outer eyewalls... as well as the brief formation of a "hub" cloud (at the center of the eye) just prior to landfall.
The following paper goes into more detail on the relationship of subsidence within the eye of hurricanes and the formation of a hub cloud.