Seasonal adjustment of monthly and quarterly data is quite prevalent in many statistical agencies. Weekly adjustment, however, is not as widespread. One reason is that weekly series are less common. Other reasons relate to the complexity of the adjustments and lack of software. Cleveland and Scott (2007) describe a seasonal adjustment method for weekly data, and Evans, Fields, and Scott (2006) present a program containing a number of diagnostics and output tables. The purpose of this paper is to illustrate the diagnostics and introduce a graphical interface that simplifies the execution of the program. Numerous tables and graphs can be viewed in the interface and stored in pdf files. The program with enhanced documentation will be available from the authors.