The Derivative

OpenSnow’s Joel Gratz built a Pod Shop for Powder Days: the PMs are Meteorologists and the Returns are Faceshots. Send It!

Mar 26, 2026
Joel Gratz, meteorologist and founder of OpenSnow who turned a local snow newsletter into a global powder‑forecasting platform. He talks about building a subscription forecasting product, why local terrain and wind make neighboring mountains behave differently, limits of long‑range forecasts, how passes change crowd dynamics, and what makes Utah, Japan, and BC unique for powder.
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INSIGHT

Why Mountain Weather Needs Local Knowledge

  • Mountain microclimates matter because sparse sensors and single snow-report points miss huge intra-mountain differences in snowfall.
  • Joel studied localized wind, terrain, and webcam clues to explain why one bowl can get 8–10 inches more than another adjacent slope.
ADVICE

Avoid Booking Trips On Six Month Forecasts

  • Do not rely on six-month seasonal forecasts for deterministic trip planning; use historical patterns and pick low-downside destinations instead.
  • Use probabilistic long-range signals only for portfolio-style risk modeling, not single-day decisions.
ADVICE

Show The Spaghetti To Communicate Confidence

  • Show model ensembles and spaghetti plots to communicate forecast confidence instead of a single deterministic number.
  • OpenSnow extended to 15-day forecasts with model-range views so users can judge high versus low confidence.
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