when you ask for, e.g, "/springfield", how do you know which Springfield you get? And how to you specify a particular Springfield out of the many?

Edit: By using '~' to use the search/lookup feature, and adding the state to be specific. The '~' will cause a line below the weather to appear, telling you where it found.

  $ curl wttr.in/~denver+iowa
  [weather stuff]
  Location: Denver, Bremer County, Iowa, 50622, United States of America [42.6713719,-92.3374045]