https://en.wikipedia.org/wiki/Del_Rio,_Texas
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 Del Rio, Texas you have to find the "Around"-Location of the Western U.S. Coast of the Gulf of Mexico. Then you go with the cursor a little inside of the continent, right at the border to Mexico. There you find the abbreviation "DRT". Then, you put the cursor on "DRT" and doubleclick it 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=2600&TO=2600&STNM=72261 : longlink.com
Below you find the last four snapshots of webpages. That way you have something reliable to get back to.

Then you compare these data with your experiences with the sky on July 26th 2015 above Del Rio, Texas 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 Del Rio, Texas.