Is it possible to update both Tomcat and a Web Viewer Build in the same session?
You can update Web Viewer and then Tomcat the same day, with only a brief recycle and sanity test between.
Apply the cumulative build. If that update goes on smoothly, then just log into the application for a quick sanity check - click the "About" link and make sure you're at the desired build, maybe browse a couple of reports - and if all seems right, then proceed with the Tomcat update, following the Special Instructions included in the download.