In remembrance of the deadly F4 tornado that devastated portions of Williamson County 20 years ago, a memorial service will be held at 7 p.m. on May 29, 2002, at the Aldergate United Methodist Church, located at the corner of Fair and East DeYoung Streets.  A 1-minute "moment of reflection" is planned at 3:16 p.m. that same day to honor those who perished in the storm in addition to the survivors of this great tragedy.  Mobile sirens and church bells will ring throughout the community at this time.