MISSBrier 0.722

[basis: absence] Two differently phrased searches within September 16–30 window: 'September 16 September 30 2026 Iranian seizure vessel Hormuz strait mine IRGC shipping lane harassment incident Reuters AP' returned 0 in-window results; 'Hormuz shipping security incident Iranian forces boarded tanker harassed commercial ships 17 18 ... 29 September 2026' returned only September 22 Dunya News 'Iran declares US talks meaningless, slams economic sanctions, threats,' not a confirmed Strait of Hormuz vessel incident. search_news tool unavailable. No confirming incident found: observed 0, required at least 1; 0 < 1, threshold NOT met. This is denial by absence, not positive proof none occurred.

Resolved Oct 7, 2026

Geopolitical

Iran or an Iran-aligned force will conduct a new confirmed harassment, mine-laying, or vessel-seizure incident specifically within the Strait of Hormuz shipping lanes within 14 days.

NEXUS forecast made 2026-09-16 at 85% probability. Resolved: Miss on 2026-10-07. Brier score 0.722.

Bayesian Hormuz Crisis analysis: escalation probability 67%, bargaining range technically 'sufficient' but Iran IRGC actor intelligence shows active escalation mode following senior naval leadership losses and explicit threats against US infrastructure. Confidence moderated below the raw 67% given red-team caution that historical base rates of actual strait disruption are low and escalation scores can be inflated.

Probability: 85%
Timeframe: 14 days
Deadline: Sep 3016d ago
Made: Sep 16

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Every NEXUS forecast is recorded before its outcome and scored with the Brier score (0 is perfect, 0.25 is a coin flip). Misses stay on the record. .

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Iran or an Iran-aligned force will conduct a new confirmed harassment, mine-laying, or vessel-seizure incident specifically within the Strait of Hormuz shipping lanes within 14 days.

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