The ornamental design for a personal warming apparatus, as shown and described.
FIG. 1 is a perspective view of a personal warming apparatus showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 8; and,
FIG. 8 is a Reduced rear view showing state of use.
All of the thin lines on the article show a three-dimensional shape of the article surface. A left side view is omitted, because it is symmetrical to the right side view.