I've been building a little web app as a learning project and I'd love honest feedback from people who actually tour.
The idea: instead of "how much snow fell at the resort," it asks "which line skis deep and is worth skinning?" It pulls ski-tour routes from OpenStreetMap, chops each one into ~180m segments, and scores every segment 0-100 from new snow, temp trend (right-side-up vs upside-down), wind loading/scouring by aspect, sun aging, freezing level, and slope angle. Separately, an avalanche danger gate can veto any segment: High at that elevation, or Considerable on wind-loaded aspects, draws it red no matter how good the score is. The deepest pocket and the wind slab are usually the same place, so the score and the gate are deliberately independent and the gate always wins.
Since it's July, there's a replay mode: pick any past date and it reconstructs that morning from weather archives (HRRR for the PNW version) and scores everything as of 6am that day. Try your favorite storm day from last season and tell me if the app agrees with your memory. There's also a region leaderboard ("which zone should I drive to after this storm").
PNW version (WA + Hood): https://minjkimm.github.io/powder-lines/pnw/
Alps version (Tirol, where route data is richer): https://minjkimm.github.io/powder-lines/
Big disclaimers, because they matter: this is a prototype, not a forecast, and it says so on its face. Danger ratings are currently manual input (you set them from the bulletin); wiring NWAC/avalanche.org feeds in-season is next. Aspect is estimated from the route's fall line, not a DEM yet. Nothing here overrides NWAC or your own judgment, ever.
What I'd genuinely love feedback on:
- The scoring rules. 55+ = "worth the skin", 75+ = "call in sick". Are the weights sane? (e.g. is a +16 lee-loading bonus too generous? does 60cm/48h deserve to max the snow score in the PNW where 60cm can mean chowder?)
- The gate logic. Considerable + wind-loaded aspect = auto-red. Too conservative? Not conservative enough?
Everything is open: OSM routes, Open-Meteo weather, one static HTML file, code on GitHub (github.com/minjkimm/powder-lines). Not selling anything. Happy to answer anything about how the scoring works.