Will __ ships transit the Strait of Hormuz on any day by May 31?

There is no fresh news available from the prompt, so the assessment relies on structural characteristics of the Strait of Hormuz and the IMF Portwatch data product: the strait is one of the busiest chokepoints for global oil and general cargo, and in normal operations daily vessel movements (including tankers, bulk carriers, containers, and general cargo) commonly produce counts that are well into the double digits, making a threshold of 20 plausible on many days. However, IMF Portwatch's metric here is "Arrivals of Ships" for the Strait of Hormuz, which may reflect arrivals to ports or transit calls rather than every AIS-transit through the chokepoint; that definitional uncertainty reduces certainty and opens the possibility that published daily counts are systematically lower than raw transit counts.

Time is a constraint: with only nine days left until May 31, the opportunity window is short, which reduces the probability relative to a longer horizon because you need at least one qualifying publication in a narrow window. Market-implied probability (~45.5% Yes) suggests other traders are discounting either recent low published counts, reporting gaps, or elevated regional risk, but the market also shows substantial volume, indicating informed disagreement and liquidity around this threshold.

Geopolitics and operational shocks are the main external risk drivers: naval incidents, temporary navigational warnings, or deliberate disruption in the Gulf could temporarily suppress vessel arrivals and thus reduce published counts, while conversely routine tanker scheduling, chartering patterns, or concentrated port operations can produce short-lived spikes above 20. Finally, data issues such as delayed publication, aggregation practices, or intra-period revisions (which the contract allows) could produce one qualifying data point even if real-time traffic is borderline, giving additional chance of a Yes outcome despite uncertainty.