https://en.wikipedia.org/wiki/Great_Falls,_Montana
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 Great Falls, Montana you have to find the "Around"-Location of the Middle of the North of the U.S. There you find the abbreviation "TFX". Then, you put your cursor on "TFX" 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=2612&TO=2612&STNM=72776 : longlink.com
Below you find the last three 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 Great Falls, Montana 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 Great Falls, Montana.