Magnifier: Use your mouse wheel (scroll) to zoom in a circular magnifier. Scroll up to zoom in, scroll down to zoom out. On a touchscreen, pinch the image to zoom. When zoom is 1× the magnifier hides.
Next / Previous: Click the ◀ and ▶ buttons, use the left/right arrow keys, or swipe left/right on the image to move between images. The magnifier stays where you placed it — handy for spotting small changes in snow level.
Jump by time: Hold Shift and press the left or right arrow keys to jump to the nearest morning/noon or similar natural break. To jump by whole days instead, hold Shift + Control while using the arrow keys.