adjective / noun
upper
UP-ur/ˈʌpər/
Located above another part or position.
The blue bowl rests on the upper shelf above the red cup.

Etymology
Up with the comparative ending means “higher up.” Upper therefore locates something relative to another part or area, rather than simply describing it as high.
In context
a upper level trough kind of digs into the eastern U.S once again along with a surface cold front approaching
More examples
- The upper reaches of the river freeze first.
- Only upper management can approve the new budget.
- These boots have leather uppers and thick rubber soles.
Forms
upper · uppers