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?

开发者_运维百科

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

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

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Google has a weather service:

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