Le Shishaldin passera-t-il en « WATCH » (vigilance renforcée) ou plus ?

Pourquoi : Extracted condition: USGS must have published the Volcano Alert Level for Shishaldin as WATCH or WARNING at any time strictly after 2026-08-15T00:00:00+00:00 and strictly before 2026-08-18T00:00:00+00:00 (use USGS notice publication timestamps). Observed data (from supplied USGS feed retrieved 2026-08-18 06:00 UTC): "Shishaldin: ADVISORY — level unchanged since 2025-08-25 19:48:35 UTC (previous level: NORMAL) — latest notice: ...2026-08-17T19:31:29+00:00". The feed's TIMING line states that "level unchanged since <date>" is when the alert level last CHANGED. Comparison: The last-change instant for Shishaldin is 2025-08-25 19:48:35 UTC, which is well before the market window start (2026-08-15T00:00:00Z). Per the feed guidance, because the last change occurred before the window, the alert level was constant through the entire window and that constant level is ADVISORY. ADVISORY is below WATCH/WARNING, and no USGS-published WATCH or WARNING for Shishaldin appears in the supplied data for the window. Therefore the condition (WATCH or WARNING published during the window) was not met. Conclusion: NO.