Port closures due to rough seas are not unforeseen: see how to reduce demurrage.

A waiting ship is not a surprise. It is a cost that was already on someone's radar.

For whoever runs a port, a fleet or works in logistics, waiting time is not a rare event. It is an expensive routine. The channel closes from swell, the ship does not berth, the line-up clogs, and the demurrage clock starts running while the team tries to understand what happened. The decision to hold or release berthing is usually made when the swell is already at the quay, not hours before.

The sector's numbers leave no doubt about the size of the hole. Globally, US$ 18 billion a year is lost to waiting and poor planning at ports, and about 8% of a ship's voyage time is spent idle at anchorage. In Brazil, accumulated demurrage at ports reached US$ 2.3 billion in 2024, up 15% over 2023. The Port of Santos alone recorded 195 hours of stoppage in 2024 due to fog, wind and sea, a record since 2021.

This cost is rarely treated as what it is: a climate variable you can anticipate.

The invisible cost: demurrage logged as "force majeure"

The demurrage invoice is visible. What stays invisible is the whole chain that swell and channel closure set in motion.

Every hour of a stopped ship costs money, and the impact does not stop at the shipowner. There is the idle berth, the lost loading window, fleet repositioning, the contract penalty, bunker burned in the "Sail Fast Then Wait" pattern and the next call compromised. In large operations, a single day of a Panamax at anchor costs between US$ 15,000 and US$ 25,000. Add that across a swell season and the number stops being noise.

It is invisible because it arrives labeled as demurrage, as force majeure, as operational delay, and almost never as what it was at the source: a wave, tide or visibility event nobody anticipated.

Why weather forecasting does not prevent a channel closure

The confusion that costs money: weather forecasting is not climate intelligence.

Public forecasting says there will be "2 meter waves" on the coast, at a scale of about 25 km. It does not tell one berth from another within the same quay, it does not see the navigation channel or the jagged coastline, nor does it answer the question that matters for the operator: will the channel close between 14h and 22h, enough to block the ship arriving tomorrow?

Climate intelligence answers that because it starts from the operation.

1. It begins by defining risk from what the port knows: which berth is critical, which draft is tight, which window protects berthing, what cannot stop and what can wait.

2. Then comes hyperlocalization, because the restriction happens at the berth and the channel, not "on the coast."

3. On top of that comes situational awareness: what closed the port last time, how that stoppage should have been handled, what demurrage could have been avoided.

4. And the output is not a wave alert. It is "high risk of full restriction, channel closed between 14h and 22h," with the recommended action and who needs to decide.

A wave bulletin reports the sea. Climate intelligence protects the margin.

The path to anticipate closure and demurrage

Anticipating means turning the forecast into a berthing decision, before the ship arrives. The path for port operations has six steps:

1. Define risk through business knowledge. Register each berth, channel entrance and channel as a monitored asset, with operational limits: wave height that halts handling, wind that suspends berthing, minimum draft by tide.

2. Forecast with lead time and hyperlocalization. Cross waves, storm surge, wind and visibility (data from the hyperlocal forecast and available sensors) with the port call. Swell usually opens a 24 to 72 hour window; cold fronts and cyclones, 3 to 7 days.

3. Understand protocols, impacts and resources. For each risk level, know which window protects berthing, when to reroute and what each waiting scenario costs.

4. Alert the right owner. The alert reaches the operator with risk level, likely window and action, per berth, not a generic wave bulletin.

5. Trigger the predefined action. With the protocol ready, the line-up adjusts before the bottleneck. The operation applies Just In Time, reduces "Sail Fast Then Wait" and protects the bunker.

6. Audit. Record the forecast event, the observed one, the recommendation sent and who decided. That trail supports demurrage disputes with the shipowner and force majeure claims.

The practical difference: reacting costs an idle berth, waiting time and demurrage. Anticipating offers a line-up reorganized with hours to days of lead time.

The proof from those who already anticipate

This is not a theory. At the Port of Coquimbo, in Chile, anticipating 25 swell events (218 hours) helped avoid port omissions, with an annualized benefit of US$ 363,000. At Mejillones, the benefit reached US$ 305,000 a year, with US$ 54,000 a year in demurrage avoided alone. At Guacolda, it was US$ 413,000 a year.

And Santos Brasil cut waiting time from seven to three days by integrating climate intelligence into the operation.

Start with your most critical berth

You do not need to cover the whole port to start. Start with the berth and operation that generate the most waiting time. Map the operational limits, cross them with closure history and see where anticipation cuts demurrage.

Request a free climate exposure diagnosis per berth!

FAQ

Can you forecast restrictions per berth, not just per region? Yes. Each port call is monitored individually, considering the channel entrance, channel, anchorage and berth, crossing hyperlocal forecasts with that point's operational limits.

How much lead time do I get? Downburst and windstorm, 1 to 6 hours. Swell, 24 to 72 hours. Cold fronts and cyclones, 3 to 7 days. River level for draft, up to 90 days.

Does this help dispute demurrage with the shipowner? Yes. Each alert, decision and action is recorded with time, data source and owner, forming the trail that supports demurrage disputes and force majeure claims.

Is this weather forecasting? No. It is a restriction risk and operational window per berth. The operator receives an action, not a wave bulletin.