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Wind speed, temps., NYC weather document

Analysis of airplane impacts.

Wind speed, temps., NYC weather document

Postby Matt » Thu Feb 24, 2011 1:29 am

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

Image

- from the image directory at http://www.loc.gov/exhibits/911/
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Re: Wind speed, temps., NYC weather document

Postby SanderO » Thu Feb 24, 2011 1:41 am

Where precisely was this data collected?
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Re: Wind speed, temps., NYC weather document

Postby Matt » Sun Feb 27, 2011 5:39 pm

Good question. I only found the image.
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Re: Wind speed, temps., NYC weather document

Postby SanderO » Sun Feb 27, 2011 6:29 pm

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.
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Re: Wind speed, temps., NYC weather document

Postby newton » Thu Apr 21, 2011 12:11 am

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.
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Re: Wind speed, temps., NYC weather document

Postby SanderO » Thu Apr 21, 2011 12:18 am

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.
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Re: Wind speed, temps., NYC weather document

Postby femr2 » Thu Apr 21, 2011 12:55 am

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