Display screen or portion thereof with animated graphical user interface for an alert screen

FIG. 1 is a front view of a display screen or portion thereof with animated graphical user interface for an alert screen, showing a first image in the sequence showing our new design;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof;

FIG. 4 is a fourth image thereof;

FIG. 5 is a fifth image thereof; and

FIG. 6 is a sixth image thereof.

FIG. 7 is a front view of a display screen or portion thereof with animated graphical user interface for an alert screen showing a first image in the sequence of the design of FIG. 1 but in an alternative broken line environment;

FIG. 8 is a second image thereof;

FIG. 9 is a third image thereof;

FIG. 10 is a fourth image thereof;

FIG. 11 is a fifth image thereof; and,

FIG. 12 is a sixth image thereof.

The outermost broken lines in the Figures illustrate a display screen and form no part of the claimed design. The remaining broken lines in the Figures illustrate portions of the graphical user interface and form no part of the claimed design.

The appearance of the animated images sequentially transitions between the images shown in FIGS. 1-6 . FIGS. 7-12 show the first embodiment design again, but in a different broken line environment. In a second embodiment, the appearance of the animated images sequentially transitions between the images shown in FIGS. 2-6 . FIGS. 8-12 show the second embodiment design again, but in a differing broken line environment. The process or period in which one image transitions to another forms no part of the claimed design.