The ornamental design for an atmospheric pressurewarningdevice, as shown and described.
FIG. 1 is a front and bottom perspective view of an atmospheric pressure
warning device showing my new design;
FIG. 2 is a front elevational view thereof; and,
FIG. 3 is a bottom plan view thereof.
The left and right side elevational views and top plan view are identical
to the bottom plan view of FIG. 3, and the rear elevational view is plain
and unornamented.