For research in short time, I tried popular and interesting weather apps, read blog posts of photographers discussing their favourite weather apps, talked with my photographer friends, and thought about my own experience as a hobbyist photographer.
Sky is a weather app that forecasts the look of the sky by showing sky color and other key information such as cloud type and coverage. Instead of offering beautiful but often misleading realistically rendered animations, Sky provides raw information for professional photographers to make their own judgement.
Each horizontal line of pixels shows the forecasted sky color. The top half above the white line is a flat block of color showing the sky color of the current time.
Tap to toggle between main view and detail view (inspired by iOS default weather app).
Scroll the bottom half (with acceleration) to navigate to different hours and days. The top half remains its position but updates its information as the bottom half scrolls.
Duration: 1 weekend.