Figure 7b-  KMOB WSR-88D 0.5 deg elevation angle reflectivity data valid 1800 UTC 13
                                    October 2001. Note the gradual movement of bounday from a position west of Mobile Bay
                                    to east of Mobile Bay over a 6 h period.  This mesoscale boundary (heavy white line) became the
                                    focus for the initiation of shallow tornado producing mesocyclones.

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