Between 17 Sep and 16 Dec 2026, does the Houthi campaign against Saudi Arabia stay contained, become a sustained war on Saudi energy, reopen a Red Sea shipping front, or wind down through the Oman channel?
Horizon 2026-12-16 · reviewed by desk:gulf on 2026-09-17
Paths
Widening to Gulf energy and shipping
Unlikely (20-45%)More Saudi energy sites or Red Sea shipping are hit; the Brent premium over WTI widens.
evidence tally — not a probability
Band set 2026-09-17 — East-West Pipeline shut since 12 Sep is a first step; ground push toward the strait reported 13-14 Sep. band history ↓
Mediated pause
Highly unlikely (5-20%)Omani- or Egyptian-brokered pause; ceasefire coverage rises while attack coverage falls.
evidence tally — not a probability
Band set 2026-09-17 — No talks reported as of filing; both sides escalated through 16 Sep. band history ↓
Contained exchange(default path)
Likely (55-80%)Attacks continue near current tempo; no further Saudi energy infrastructure is hit.
evidence tally — not a probability
Band set 2026-09-17 — No strait attacks reported since fighting resumed; hits so far are Saudi-territory only. band history ↓
Signposts
Widening to Gulf energy and shipping
- Quietheldprovisionalweight 2
Coverage of attacks on Saudi energy sites stays abnormally high
Carried forward from quiet — data degraded (gap), held 1 of 3 days.
lit on 2% of evaluable days (n=123)
- Quietheldprovisionalweight 2
Ships reported attacked or seized near Bab al-Mandab
Carried forward from quiet — data degraded (gap), held 1 of 3 days.
lit on 4% of evaluable days (n=144)
- Quietheldprovisional
Brent trades at least $6 over WTI
Carried forward from quiet — data degraded (gap), held 1 of 3 days.
lit on 57% of evaluable days (n=149)
- Quietheldprovisional
Saudi riyal quoted more than 0.5% off its 3.75 peg on 2 consecutive days
Carried forward from quiet — data degraded (gap), held 2 of 3 days.
lit on 0% of evaluable days (n=149)
- Litprovisionalweight 2
East-West Pipeline reported shut (editor log)
manual rule reads lit (value=n/a).
lit on 100% of evaluable days (n=151)
Mediated pause
- Litheldprovisionalweight 2
Talk of a Yemen truce rises across outlets
Carried forward from lit — data degraded (gap), held 1 of 3 days.
lit on 3% of evaluable days (n=144)
Contained exchange
- Quietheldprovisionalweight 2
Houthi coverage back within 1.5x of its summer baseline
Carried forward from quiet — data degraded (gap), held 1 of 3 days.
lit on 70% of evaluable days (n=123)
- No dataprovisional
Saudi equities do not fall more than 5% in a week
No usable data for this signpost right now.
What it would move
Brent prices this path first, but also carries Hormuz risk, so alone it cannot separate the two.
The most direct read on markets pricing attacks on Saudi territory.
The evidence
No new evidence this week.
On the record
Will Saudi authorities or Aramco announce the East-West Pipeline has resumed flows by 15 Oct 2026?
openA Zaviye story cluster quoting Saudi Aramco or the Saudi energy ministry; the resolving editor links the story id.
Opens 2026-09-18 · Closes 2026-10-15 · baseline editor_default (50% hist. freq., n_eff=0.0)
Current band: Roughly even (45-55%)
Revision history (1)
2026-09-17 Roughly even (45-55%) — desk:gulf
No timeline given by Saudi authorities as of filing.
Will Houthi forces strike or seize a commercial vessel in or within 50km of Bab al-Mandab between 17 Sep and 31 Oct 2026?
voidYES if outlets from ≥2 distinct source blocs report a strike on or seizure of a named commercial vessel in that area/period. Intercepted-but-unconfirmed claims do not count.
Opens 2026-09-18 · Closes 2026-10-31 · baseline signal_replay (0% hist. freq., n_eff=0.0)
Current band: Unlikely (20-45%)
Revision history (1)
2026-09-17 Unlikely (20-45%) — desk:gulf
No strait attacks yet; ground push toward the strait reported 13-14 Sep.
Voided: Voided during integration (2026-09-17): its baseline was frozen with hist_freq=0.0 before its underlying signal_replay series had any real backfilled history. zaviye_scn_forecast_baseline is write-once by design, so the wrong number could not be corrected in place. Reissued with a '-v2' key and a correctly measured baseline. No reader ever saw this forecast — it predates the engine's launch.
Will Houthi forces strike or seize a commercial vessel in or within 50km of Bab al-Mandab between 17 Sep and 31 Oct 2026?
voidYES if outlets from ≥2 distinct source blocs report a strike on or seizure of a named commercial vessel in that area/period. Intercepted-but-unconfirmed claims do not count.
Opens 2026-09-18 · Closes 2026-10-31 · baseline signal_replay (98% hist. freq., n_eff=95.0)
Current band: Unlikely (20-45%)
Revision history (1)
2026-09-17 Unlikely (20-45%) — desk:gulf
No strait attacks yet; ground push toward the strait reported 13-14 Sep.
Voided: Voided during integration (2026-09-17): its baseline (hist_freq=0.979) was frozen against news.bab_mandab_ship_attack.count BEFORE that concept's mandatory precision preview was ever run. The preview found the concept badly miscalibrated (matched football listings, an Odesa naval story, a Caribbean strike, an actor's birthday party -- real on-topic hits were close to 0/20). The concept was tightened and re-verified (18/13 on-topic titles, see concepts.toml audit block), the series was re-backfilled, but zaviye_scn_forecast_baseline is write-once by design so the wrong number could not be corrected in place. Reissued with a '-v3' key and a correctly measured baseline. No reader ever saw this forecast -- it predates the engine's launch.
Will Houthi forces strike or seize a commercial vessel in or within 50km of Bab al-Mandab between 17 Sep and 31 Oct 2026?
openYES if outlets from ≥2 distinct source blocs report a strike on or seizure of a named commercial vessel in that area/period. Intercepted-but-unconfirmed claims do not count.
Opens 2026-09-18 · Closes 2026-10-31 · baseline signal_replay (0% hist. freq., n_eff=95.0)
Current band: Unlikely (20-45%)
Revision history (1)
2026-09-17 Unlikely (20-45%) — desk:gulf
No strait attacks yet; ground push toward the strait reported 13-14 Sep.
q
voidc
Opens 2026-09-17 · Closes 2026-10-01
Current band: Likely (55-80%)
Revision history (3)
2026-09-17 Unlikely (20-45%) — desk:gulf
r1
2026-09-24 Roughly even (45-55%) — desk:gulf
r2
2026-10-01 Likely (55-80%) — desk:gulf
tampered
Voided: WP2 acceptance-test fixture, not a real forecast
What changed
- 2026-09-17 Contained exchange band set to Likely (55-80%) by sync
- 2026-09-17 Mediated pause band set to Highly unlikely (5-20%) by sync
- 2026-09-17 Widening to Gulf energy and shipping band set to Unlikely (20-45%) by sync