Only zip code 44128 will return weather data.

Only zip code 44128 will actually return weather date.  If I change the following string to any known zip code I get no data returns.

Returns Weather Data
=WEBSERVICE("http://api.wunderground.com/api/API/history_" & PriorDate &"/q/44128.xml")

Does not Return Weather Data
=WEBSERVICE("http://api.wunderground.com/api/API/history_" & PriorDate &"/q/45202.xml")