{"schemaVersion":"1.0.0","frozen":true,"recordedAt":"2026-08-19T00:00:00.000Z","methodVersion":"v1.0","season":"2026-27","title":"The SnowSure El Niño Prediction Ledger — Winter 2026-27","subtitle":"Recorded August 19, 2026 · Method v1.0 · This document does not get edited. It gets graded.","setup":"NOAA CPC, August 2026: >90% probability of a very strong El Niño; 69% chance the Oct–Dec index exceeds anything since 1950. Our signal: each resort's average snowfall in the three strongest El Niño winters ('97-98, '15-16, '23-24) vs its own 30-year ERA5 baseline. n = 3 — a lean, not a law. That honesty is the point of grading it.","why":"Every ski account will make El Niño predictions this fall. To our knowledge, none has ever published its scoring rules in advance and graded itself in public. If we're right, the receipts are the marketing. If we're wrong, the post-mortem is the content — and next year's model gets better. Either way, \"SnowSure grades its own forecasts\" becomes the sentence that separates us from every repost account in the feed.","firstGradeNote":"First grade lands early December 2026 — the Andes verdict.","signalDefinition":"average snowfall in the three strongest El Niño winters since 1996 ('97-98, '15-16, '23-24) versus this resort's own 30-year ERA5 baseline.","windows":{"sh":{"start":"2026-06-01","end":"2026-11-30","gradedFrom":"2026-12-01","label":"Jun 1–Nov 30, 2026, graded first week of December 2026"},"nh":{"start":"2026-09-01","end":"2027-06-30","gradedFrom":"2027-06-01","label":"Sep 1, 2026–Jun 30, 2027, graded first week of June 2027"}},"measurementProtocol":["Data: the same ERA5-based season totals as the signal itself — measured against each resort's own 30-year average, never against another resort or a marketing total. Snow-day counts for prediction 8 from the same archive.","Windows: SH season = Jun 1–Nov 30, 2026, graded first week of December 2026. NH season = Sep 1, 2026–Jun 30, 2027, graded first week of June 2027.","Grader: automated (scheduled runs already created), published regardless of outcome. Interim standings appear in the weekly in-season scorecard (Dec–Mar) so the final grade is never a surprise.","No edits: this ledger and predictions-2026-27.json are frozen as of August 19, 2026. If we ever change a threshold, the change gets its own dated line and the original stays visible."],"tierCounts":{"A":43,"B":22,"C":22,"D":17,"E":35},"tierThresholds":{"A":{"signal":"≥ +8%","hit":{"kind":"gte","value":5},"partial":{"lo":-5,"hi":5},"miss":{"kind":"lte","value":-5}},"B":{"signal":"+3 to +8%","hit":{"kind":"gte","value":0},"partial":{"lo":-5,"hi":0},"miss":{"kind":"lt","value":-5}},"C":{"signal":"±3%","hit":{"kind":"within","value":10},"partial":null,"miss":{"kind":"outside","value":10}},"D":{"signal":"−8 to −3%","hit":{"kind":"lte","value":0},"partial":{"lo":0,"hi":5},"miss":{"kind":"gt","value":5}},"E":{"signal":"≤ −8%","hit":{"kind":"lte","value":-3},"partial":{"lo":-3,"hi":5},"miss":{"kind":"gt","value":5}}},"headlines":[{"id":1,"key":"andes-above-average","prediction":"The Andes finish their 2026 winter above average (Portillo, Las Leñas, Valle Nevado, La Parva basket)","hitIf":"basket ≥ +10%","gradedOn":"2026-12-01","hemisphere":"SH","rule":{"kind":"gte","value":10},"members":[{"slug":"portillo","name":"Portillo","strongPct":81.3,"avg30":352,"tier":"A","rank":1,"southernHemisphere":true},{"slug":"las-lenas","name":"Las Leñas","strongPct":66.4,"avg30":414,"tier":"A","rank":2,"southernHemisphere":true},{"slug":"valle-nevado","name":"Valle Nevado","strongPct":59.6,"avg30":346,"tier":"A","rank":3,"southernHemisphere":true},{"slug":"la-parva","name":"La Parva","strongPct":59.6,"avg30":346,"tier":"A","rank":4,"southernHemisphere":true}]},{"id":2,"key":"utah-above-average","prediction":"Utah finishes above average (Alta + Snowbasin)","hitIf":"basket ≥ +5%","gradedOn":"2027-06-01","hemisphere":"NH","rule":{"kind":"gte","value":5},"members":[{"slug":"alta","name":"Alta","strongPct":12.1,"avg30":330,"tier":"A","rank":19,"southernHemisphere":false},{"slug":"snowbasin","name":"Snowbasin","strongPct":14.8,"avg30":258,"tier":"A","rank":12,"southernHemisphere":false}]},{"id":3,"key":"tahoe-above-average","prediction":"Tahoe finishes above average (Palisades + Heavenly + Kirkwood)","hitIf":"basket ≥ +5%","gradedOn":"2027-06-01","hemisphere":"NH","rule":{"kind":"gte","value":5},"members":[{"slug":"palisades-tahoe","name":"Palisades Tahoe","strongPct":9.2,"avg30":576,"tier":"A","rank":35,"southernHemisphere":false},{"slug":"heavenly","name":"Heavenly","strongPct":7.5,"avg30":506,"tier":"B","rank":45,"southernHemisphere":false},{"slug":"kirkwood","name":"Kirkwood","strongPct":8.9,"avg30":631,"tier":"A","rank":37,"southernHemisphere":false}]},{"id":4,"key":"high-alps-above-average","prediction":"The high Alps finish above average (Zermatt, Arlberg, Val d'Isère, Grands Montets, Andermatt)","hitIf":"basket ≥ 0%","gradedOn":"2027-06-01","hemisphere":"NH","rule":{"kind":"gte","value":0},"members":[{"slug":"matterhorn-ski-paradise","name":"Zermatt / Matterhorn","strongPct":5.7,"avg30":647,"tier":"B","rank":58,"southernHemisphere":false},{"slug":"ski-arlberg","name":"Ski Arlberg (St. Anton)","strongPct":10.5,"avg30":579,"tier":"A","rank":26,"southernHemisphere":false},{"slug":"val-disere","name":"Val d'Isère","strongPct":7.1,"avg30":626,"tier":"B","rank":50,"southernHemisphere":false},{"slug":"grands-montets","name":"Grands Montets (Chamonix)","strongPct":12.7,"avg30":622,"tier":"A","rank":17,"southernHemisphere":false},{"slug":"andermatt","name":"Andermatt","strongPct":18.7,"avg30":647,"tier":"A","rank":7,"southernHemisphere":false}]},{"id":5,"key":"colorado-enso-proof","prediction":"Colorado stays ENSO-proof (Vail + Aspen Mountain)","hitIf":"basket within ±10%","gradedOn":"2027-06-01","hemisphere":"NH","rule":{"kind":"within","value":10},"members":[{"slug":"vail","name":"Vail","strongPct":-0.6,"avg30":316,"tier":"C","rank":77,"southernHemisphere":false},{"slug":"aspen-mountain","name":"Aspen Mountain","strongPct":0.6,"avg30":330,"tier":"C","rank":73,"southernHemisphere":false}]},{"id":6,"key":"washington-below-average","prediction":"Washington runs below average (Mt. 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