Yahoo weather API failing from Apigee Edge

[#1]

cusers333478downloadshumanaweatherapi-rev1-2015-05.zipHi,

I have developed a simple API service using Apigee. The back end is Yahoo weather API. Wen I try to hit it Post man I'm getting the below error

{
  "fault": {
    "faultstring": "The Service is temporarily unavailable",
    "detail": {
      "errorcode": "messaging.adaptors.http.flow.ServiceUnavailable"
    }
  }
}

I have attached the service proxy that I developed along with this email.