Tornado Damage: A Look at How the Survey is Done (vid)...

...given the recent attention to tornadoes following the Moore, OK event, ...i thought it would interest some in finding out a little about how tornado damage surveys and ratings are done... As you'll see, the NWS does a very thorough analysis, and factors in the construction methods of the damaged structures, including the impact of "poor construction" methods which can be a detriment to the fujita scale rating, and also extreme phenomena/damage (the concrete parking stops ripped from the parking lot of the hospital..., projectile impailments, etc.)

here is a good showcase of the damage survey from the Joplin, MO tornado, i think you'll find very interesting...

Video presentation (Damage Survey from Joplin Tornado) from AMS 26th Conference on Severe Local Storms:
https://ams.confex.com/ams/26SLS/flvgateway.cgi/id/22957?recordingid=22957