Calls to retrieve data for a specific location are intermittently returned incorrect values for the icon_url field. Please see the following JSON snippet from data returned by the call that contains icon_url values that end in 'nt_.gif':
https://api.wunderground.com/api/<key>/conditions/forecast/q/33626.json <br><br>(Note that subsequent calls to this same URL just a few minutes later returned data with correct icon_url values in it)<br>
<br>
"forecast":{"txt_forecast": {
"date":"",
"forecastday": [ { "period":0, "icon":"partlycloudy", "icon_url":"http://icons.wxug.com/i/c/k/partlycloudy.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } , { "period":1, "icon":"nt_", "icon_url":"http://icons.wxug.com/i/c/k/nt_.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } , { "period":2, "icon":"mostlycloudy", "icon_url":"http://icons.wxug.com/i/c/k/mostlycloudy.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } , { "period":3, "icon":"nt_", "icon_url":"http://icons.wxug.com/i/c/k/nt_.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } , { "period":4, "icon":"mostlycloudy", "icon_url":"http://icons.wxug.com/i/c/k/mostlycloudy.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"2" } , { "period":5, "icon":"nt_", "icon_url":"http://icons.wxug.com/i/c/k/nt_.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } , { "period":6, "icon":"chancerain", "icon_url":"http://icons.wxug.com/i/c/k/chancerain.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"24" } , { "period":7, "icon":"nt_", "icon_url":"http://icons.wxug.com/i/c/k/nt_.gif", "title":"", "fcttext":"", "fcttext_metric":"", "pop":"0" } ] },...