Speculation: Altus is an air force base. The image is directly on the other side of that base from the weather radar station and approximately the same distance radar - Altus and Altus - image. There could be some interference from a radar station at the base itself which is registering as an echo.
Second speculation: I tried to take a quick look on Google Earth to see if there was a hill or ridge that could cause a ground clutter type echo. The terrain in that area changes from farm fields (presumably flat) to what looks to me to be a hill or ridge of some kind. This could cause a ground clutter echo that is not being adequately corrected for.
Or it could be an alien landing site. That would at least be more interesting.