Compounding is the whole story
A typhoon closing a South China port for two days is routine. The schedule absorbs it.
The same closure in a year when Hormuz is shut, the Red Sea is contested and the Panama Canal is rationing slots is not routine, because there is no slack anywhere in the network to absorb it. Vessels that would normally catch up cannot. Berth windows that would normally be rescheduled cannot. The delay propagates rather than dissipating.
Sea-Intelligence has estimated that around 5% of global deep-sea capacity — roughly 1.7 million TEU — has been tied up by delays, congestion and related factors, with only a little over half of container vessels running on schedule. In a system operating with that little margin, a weather event that would once have cost a day costs a week.
Where the credit damage lands
Idle vessels. A vessel waiting out a storm or a closed port earns nothing and costs the same. For an operator on thin voyage margins, a week of that is a cash flow event.
Spoiled and damaged cargo. Reefer cargo, agricultural products and temperature-sensitive goods degrade. The resulting claims sit between shipper, carrier, insurer and receiver, and nobody pays anything until they are resolved.
Disputed invoices. Weather is the most contested force majeure trigger in shipping, because the threshold between severe weather and foreseeable seasonal conditions is a matter of argument. Contested invoices age.
Inland cascade. Port closures back up into rail and road networks. Cargo that reaches the quay still cannot reach the customer, and the payment that depends on delivery stays outstanding.
Exposure is a map question
The practically useful question during a weather event is narrow: which counterparties have vessels or cargo in the affected area right now?
Most credit systems cannot answer it, because they hold counterparties as legal entities with registered addresses rather than as moving positions. A counterparty registered in Singapore may have nothing in the storm's path. One registered in Hamburg may have three vessels in it.
Answering the question requires vessel-level position data mapped to counterparty exposure. Once that exists, a weather event becomes a filter rather than a fire drill.
What CERTY does about this
Real-time exposure dashboards show which counterparties and vessels sit in a storm's path before a payment is already overdue. Because position data is tied to counterparty exposure rather than to registered domicile, a weather event can be filtered down to the specific book entries it actually touches.
