Mammoth & Eastern Sierra
Data-driven analysis of 1 resort — NWS forecast accuracy, storm rankings, and local knowledge, powered by SNOTEL ground truth.
The Headlines
Mammoth Mountain averaged 6.7"/storm-day — the region's top producer with 400" on the season.
The region's biggest drop: 40" at Mammoth Mountain on Jan 15, 2026.
NWS overpredicted snowfall at Mammoth Mountain by 30% this season. Grade: A.
Resort Rankings
Sorted by calibrated season snowfall total. NWS grade reflects forecast accuracy.
| # | Resort | Season Total | Avg/Storm-Day | Best Storm | NWS Grade |
|---|---|---|---|---|---|
| 1 | Mammoth MountainCA | 400" | 6.7"/day | 40" | A |
NWS Forecast Accuracy
How much did the National Weather Service overpredict snowfall vs. SNOTEL ground-truth measurements? Lower is better. This is the core StormDrop data advantage.
Storm Timeline
Monthly snowfall across the region — feast months vs. famine months.
What Locals Are Saying
Top community intel from TGR forum data. The best powder intel isn't in the forecast.
“Chapter 5: Post-storm best bet, untracked lines available late day”
Don't Get Skunked Next Season
This season proved you can't trust the forecast alone. NWS overpredicted by up to 30% at Mammoth Mountain. StormDrop tells you what will actually fall — and where to go when your home mountain isn't delivering.