The Soft Commodity Charter: Who Pays When the Port Closes Early
Quote from chief_editor on May 26, 2026, 3:30 pmPort closures during agricultural commodity loading for weather or berth availability shift demurrage risk in ways that most spot charterers do not model.
A Handymax vessel loading corn at a Gulf of Mexico export terminal encountered a weather-related port closure on day two of loading. The terminal suspended operations for 18 hours due to electrical storm warnings. The charterparty specified that laytime was calculated on a "weather working days" basis — meaning weather delays were supposed to stop the laytime clock. The terminal operations supervisor signed a statement confirming the stoppage was weather-related.
When the voyage was completed and laytime was calculated, the shipowner disputed the exclusion of the 18 hours. Their argument: the vessel did not stop loading because of weather — it stopped because the terminal suspended operations. The weather caused the terminal to suspend, but the charterparty's weather exception referred to weather preventing the loading operation directly, not weather causing third-party operational decisions.
This is not a rare dispute. It is a predictable dispute that arises from the gap between charterparty language and terminal operational reality.
Weather Working Days vs. WWDSHEX vs. WIBON: The Language Matters More Than the Principle
Laytime calculation involves a set of abbreviations that have specific legal meanings developed through decades of English and international arbitration. "Weather Working Days" (WWD) means days when work is usually done but that are not interrupted by weather. "WWDSHEX" means weather working days, Sundays and holidays excluded. "WIBON" means whether in berth or not.
The precise meaning of each of these terms in the context of specific weather events, specific terminal operational decisions, and specific cargo handling equipment has been litigated extensively. Whether a terminal's decision to suspend operations due to weather qualifies as a weather exception under the charterparty's language, versus a terminal operational decision that happens to be caused by weather, depends on the specific clause language and applicable arbitration precedents.
Cases where terminals have suspended for weather-precautionary reasons — not because loading was physically impossible at that moment, but because the terminal's safety protocols required suspension — have gone both ways in arbitration depending on the specifics. The charterparty language "weather preventing loading operations" is different from "weather causing terminal suspension of operations." These distinctions seem technical until the 18 hours in question represent $5,000 in demurrage versus dispatch.
Industry estimates suggest that laytime dispute frequency is higher for grain and agricultural commodity trades than for mineral trades, partly because agricultural export terminals are more weather-sensitive in their operations and partly because the voyage economics on smaller vessels (Handymax, Supramax) make individual demurrage disputes worth contesting even when the amounts are modest.
The Pre-Fixture Investigation
A charterer loading agricultural commodities at a specific terminal, in a specific season, on a regular basis, should know that terminal's operational history: how frequently it suspends for weather, what the seasonal weather pattern looks like, and how its operational suspensions have been characterized in charterparty disputes. This is terminal-specific knowledge that experienced operators accumulate over multiple voyages.
For a first-time loader at a specific terminal, or for a trader moving into a new trade route, this knowledge has to be acquired from brokers, port agents, or shipping lawyers with direct experience on that terminal. The charterparty language can be negotiated to reduce ambiguity — for example, explicitly specifying that terminal operational suspensions for weather are excepted periods regardless of whether loading was physically possible at that moment. Shipowners may resist this language, but it is negotiable.
The demurrage dispute that arises from the gap between "weather working days" and "terminal weather suspension" was predictable before the charter was fixed. The fixture documents that would have been examined at the time of charterparty negotiation — the terminal's standard conditions, the port agent's operational notes, the prevailing weather pattern for the loading month — contain the information needed to draft charterparty language that would have reduced or eliminated the dispute. That review happens at fixture, not after the vessel has completed loading and the laytime statement arrives.
Port closures during agricultural commodity loading for weather or berth availability shift demurrage risk in ways that most spot charterers do not model.
A Handymax vessel loading corn at a Gulf of Mexico export terminal encountered a weather-related port closure on day two of loading. The terminal suspended operations for 18 hours due to electrical storm warnings. The charterparty specified that laytime was calculated on a "weather working days" basis — meaning weather delays were supposed to stop the laytime clock. The terminal operations supervisor signed a statement confirming the stoppage was weather-related.
When the voyage was completed and laytime was calculated, the shipowner disputed the exclusion of the 18 hours. Their argument: the vessel did not stop loading because of weather — it stopped because the terminal suspended operations. The weather caused the terminal to suspend, but the charterparty's weather exception referred to weather preventing the loading operation directly, not weather causing third-party operational decisions.
This is not a rare dispute. It is a predictable dispute that arises from the gap between charterparty language and terminal operational reality.
Weather Working Days vs. WWDSHEX vs. WIBON: The Language Matters More Than the Principle
Laytime calculation involves a set of abbreviations that have specific legal meanings developed through decades of English and international arbitration. "Weather Working Days" (WWD) means days when work is usually done but that are not interrupted by weather. "WWDSHEX" means weather working days, Sundays and holidays excluded. "WIBON" means whether in berth or not.
The precise meaning of each of these terms in the context of specific weather events, specific terminal operational decisions, and specific cargo handling equipment has been litigated extensively. Whether a terminal's decision to suspend operations due to weather qualifies as a weather exception under the charterparty's language, versus a terminal operational decision that happens to be caused by weather, depends on the specific clause language and applicable arbitration precedents.
Cases where terminals have suspended for weather-precautionary reasons — not because loading was physically impossible at that moment, but because the terminal's safety protocols required suspension — have gone both ways in arbitration depending on the specifics. The charterparty language "weather preventing loading operations" is different from "weather causing terminal suspension of operations." These distinctions seem technical until the 18 hours in question represent $5,000 in demurrage versus dispatch.
Industry estimates suggest that laytime dispute frequency is higher for grain and agricultural commodity trades than for mineral trades, partly because agricultural export terminals are more weather-sensitive in their operations and partly because the voyage economics on smaller vessels (Handymax, Supramax) make individual demurrage disputes worth contesting even when the amounts are modest.
The Pre-Fixture Investigation
A charterer loading agricultural commodities at a specific terminal, in a specific season, on a regular basis, should know that terminal's operational history: how frequently it suspends for weather, what the seasonal weather pattern looks like, and how its operational suspensions have been characterized in charterparty disputes. This is terminal-specific knowledge that experienced operators accumulate over multiple voyages.
For a first-time loader at a specific terminal, or for a trader moving into a new trade route, this knowledge has to be acquired from brokers, port agents, or shipping lawyers with direct experience on that terminal. The charterparty language can be negotiated to reduce ambiguity — for example, explicitly specifying that terminal operational suspensions for weather are excepted periods regardless of whether loading was physically possible at that moment. Shipowners may resist this language, but it is negotiable.
The demurrage dispute that arises from the gap between "weather working days" and "terminal weather suspension" was predictable before the charter was fixed. The fixture documents that would have been examined at the time of charterparty negotiation — the terminal's standard conditions, the port agent's operational notes, the prevailing weather pattern for the loading month — contain the information needed to draft charterparty language that would have reduced or eliminated the dispute. That review happens at fixture, not after the vessel has completed loading and the laytime statement arrives.