If you're looking for an a weather-checking tool that scales well on everything from a mobile phone screen to a full-size monitor, WeatherTiles is a highly visible and easy to use tool.
WeatherTiles is a weather service that presents the current and projected weather for cities in a series of tiles. The more cities you add, the more tiles appear in WeatherTiles — although as you get higher in number you'll want to zoom your browser window out to make room for them. It scales well as you can use a single tile for smalls screens like your iOS or Android-based devices or numerous tiles if you're using a spare monitor as your weather station — most monitors will look best with 6-8 tiles.
WeatherTiles is a free service and requires no registration. Have a favourite weather tool or another 3m display-style reporting tool to share? Let's hear about it in the comments. Thanks envador!