This fork of a tree visualization displays weather data in a vertical hierarchical structure, showing cities with their timestamped readings and a final layer for temperature, pressure, wind speed, and humidity values. It fetches CSV data from a GitHub gist, transforms it into a tree using `d3.hierarchy` and `d3.tree`, and renders the result as an SVG. The network of links is drawn with `d3.linkVertical` paths, while nodes and labels are styled via CSS classes for circles, rectangles, polygons, and text.