Peak WX

        features:
          location    search by name, zip, airport code, or lat,lon
                      recent locations, permalink urls (?q= short), geolocation
                      recent list: type to filter, remove single / clear all, re-shows METAR/TAF for saved airports
          forecast    current + daily periods, expandable hourly detail
                      mountain base/peak temps (lapse-rate estimate, ±300m from station elev), snow depth, icy-conditions flag
                      sub-freezing temps highlighted
                      freezing level FZLVL
          aviation    raw + decoded METAR/TAF by ICAO/IATA
                      3-letter codes auto-tried as K-prefixed US ICAO; falls back to aviationweather.gov link if no raw report
          alerts      live NWS alerts, winter hazards flagged distinctly
                      self-computed overnight frost/freeze
          trackers    cold - coldest US + world spots (400+ locations, US + world)
                      snow - ski area current conditions & 7-day forecast (549 top areas)
                      snow: near me - sort/filter by distance via geolocation
          units       F/C toggle (persisted), switches wind/precip units + date format
                      auto light/dark theme
          text mode   plaintext view, curl/lynx friendly, ?format=text urls
                      copy link / copy plaintext summary
          offline     cached results with per-type TTLs, stale fallback, force refresh
                      batched + rate-limited tracker requests
          header      live clock, updates every 30s

        shortcuts:
          /  search location
          f  F units (°F, mph, in)
          c  C units (°C, km/h, mm, cm)
          k  cold tracker - coldest spots US + world
          s  snow tracker (now / 7-day)
          r  force refresh - purge cache, reload fresh
          t  toggle text mode (pre block, curl friendly)
          h  toggle this help
          esc close tracker / help / unfocus

        sources: National Weather Service (weather.gov) / Open-Meteo (open-meteo.com) / Aviation Weather (aviationweather.gov)
        cache: location 3h, cold 3h, snow now 6h, 7-day 12h