https://en.wikipedia.org/wiki/Blacksburg,_Virginia
longlink.com

http://weather.uwyo.edu/upperair/sounding.html

If you get the map in the link above, you find a lot of locations with different abbreviations on the map.
For Blacksburg, Virginia you have to find the "Around"-Location of the middle of the U.S. East Coast. There, you find the abbreviation "RNK". Then, you put the cursor on "RNK" and doubleclick with the left key of your mouse. Then, you will get the list of data in that location, which gives you also the data in different heights above the location.

The link at the moment is:
http://weather.uwyo.edu/cgi-bin/sounding?region=naconf&TYPE=TEXT%3ALIST&YEAR=2015&MONTH=07&FROM=2400&TO=2400&STNM=72318 : longlink.com
Below you find four snapshots of the webpages. That way you have something reliable to get back to.

Then you compare these data with your experiences with the sky on July 24th 2015 above Blacksburg, Virginia and go to the link

http://globalskywatch.com/chemtrails/ubbthreads.php?ubb=showflat&Number=15776#Post15776

where you learn how to use these data according to present-day scientific knowledge for the right interpretations of the events in the sky above Blacksburg, Virginia.