The 9/11 Forum

I thought this may be useful for flight path analysis... Also exact temperatures help find precise speed of sound.



- from the image directory at http://www.loc.gov/exhibits/911/

Where precisely was this data collected?

Good question. I only found the image.

You can gauge the winds aloft from some of the dust cloud movement if you know the frame rate. Look at the spire collapsing and measure the displacement to the SE and with the time diff you can calculated the wind speed. Looks like 15+ ... a guess.

does that not assume that there is no extra heat in the cloud, sanderO? i don't think it's "right" to use the clouds expansion rate as evidence of windspeed.

I am not referring to the cloud expansion rate, but the dust cloud "left behind" is moving like a vertical column toward the SE. It's clearly not above the collapsing tower debris.

I'd avoid any calculation *near* descent time. Too many other factors during and for a while afterwards.