21 September 2006 was not a very active severe weather day, so the Storm Prediction Center did not create a data and products archive for the day in their Severe Thunderstorm Events archive.
The following links are archives of the SPC products and storm reports. Mesoscale discussions and watches that were issued outside of the chase area are not included.
SPC Convective Outlooks
Day 1 Convective Outlook, 0600Z
Day 1 Convective Outlook, 1300Z
Day 1 Convective Outlook, 1630Z
Day 1 Convective Outlook, 2000Z
Day 1 Convective Outlook, 0100Z
Mesoscale Discussions
Watches