What are some alternatives?
When comparing AccuWeather and Weather Underground, you can also consider the following products
Forecastie - A simple, opensource weather app for Android.
Dark Sky for Web - Hyperlocal weather information, now on the web ⛈
The Weather Channel - The Weather Channel and weather.com provide a national and local weather forecast for cities, as well as weather radar, report and hurricane coverage
YoWindow - YoWindow is a new kind of weather app that works like your window.
1Weather - A beautiful designed UI for a weather app.
Windy - Wind and weather forecast for kiters, surfers, pilots, sailors and anyone else.