Original F-scale:
F2 Tornado Damage (Online Tornado FAQ)

On 3 January 2000, a tornado struck this wood-frame home near Paris, MS. The roof and one large outer wall segment came off; while the remaining inner and outer walls were left (barely) standing. Quality of construction must be considered when rating damage; since the F scale is best applied to well-built homes. Here, the wall-to-roof and wall-to-wall attachments were very weak or nonexistent; so this is only marginal F2 damage.