Ah yes, I made a similar site at https://wikiwalk.app mostly to learn Rust and brush up on graph theory. Unfortunately wikigrapher is throwing 502s now.
Idea for any weather app: integration with driving directions via Google Maps API or OSM. Going on long trips without this is super dangerous on a motorcycle but all drivers could benefit. It's easy to optimize for minimizing dollars or time spent, but optimizing for minimizing chances of death due to weather is lacking.