1 Severe or bare in appearance or outline.
1.1 Unpleasantly or sharply clear.
2 attributive Complete; sheer.
2.1 rare Completely naked.
3 archaic, literary Stiff, rigid, or incapable of movement.
3.1 Physically strong or powerful.
Old English stearc ‘unyielding, severe’, of Germanic origin; related to Dutch sterk and German stark ‘strong’.
The stark contrast of wet and dry is a hallmark of thunderstorms, particularly in eastern Colorado.