Kerry;
You should be able to create a query to gather only red severity events, and then make this query part of a report.
In the query, you will want to click the "ANY" under the 'Events' column. In the resulting pane, you will want to set the "Restrict to Severity" drop-down to "Red". From there you can further tune the query to restrict it to specific reporting devices, events, etc. This query should return only red severity events. From there, you can make this query a report by clicking the "Save As Report" button.
Scott