weather forecast web service by city name in silverlight?

Does anyone know the web service for getting weather forecast information by passing city name as a parameter in Silverlight application?

In Yahoo weather web service I can pass 'woeid' only.

Is there a way to pass a city name directly and get the information?

Google has a weather service:

http://blog.programmableweb.com/2010/02/08/googles-secret-weather-api/