A remake of Tableau's "Storm Watch" data viz: http://www.tableausoftware.com/public/gallery/storm-tracking
Makes use of the line width plugin by Lars Kotthoff: https://rawgit.com/larskotthoff/d3/varline/src/svg/line-variable.js
https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js
https://gist.githubusercontent.com/biovisualize/b9a321c5038d24206356/raw/d6c542f19772b28d19c5be056f6f084ed6d71974/line-variable.js
https://cdnjs.cloudflare.com/ajax/libs/topojson/2.2.0/topojson.min.js