Create "Twitnderground" or "Weather Untter" using

Twitter

&

Weather Underground

Need some info before making a decision? Here's some quick stats about the APIs

Twitter Weather Underground
API Homepage: https://dev.twitter.com/docs http://www.wunderground.com/weather/api/
Developer key required: No Yes
Mashups: 0 mashups with this API 1 mashups with this API