Snowline — Mammoth-area snow quality (experimental)

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Snow quality layers

Zones colored by snow quality Runs colored by snow quality Detailed snow types (powder, chalk, buff, crust, corn…) Wind texture: scoured vs deposited (30 m) Run names Show snow depth as transparency Zone opacity

Zone timeline (selected day, 06–18 PT)

Weather layers (HRRR, 3 km)

Wind arrows (ridge level) New snow, last 24 h New snow, next 24 h

Map

Winter imagery (Sentinel-2, 11 Mar 2026) Summer imagery (USGS) Hillshade Lifts 3D terrain

Season

bars: new snow · top band: ESAC danger · green line: share of zones softening at 1 pm · ▲ event. Click to jump.

Snow quality: zone forecast (aspect × elevation) from one HRRR column above the ski area; each run inherits its dominant zone. Replay of the 2025–26 season from archived HRRR forecasts; not a live forecast. Imagery: Copernicus Sentinel-2, USGS. Map data © OpenStreetMap contributors (ODbL). Terrain: USGS 3DEP lidar.