China's Ports Have Taken Two Typhoons Since Late August. Carriers Answered the Backlog With Fewer Sailings, Not More.
September is shaping up as the busiest month U.S. ports have had all year, right as a second typhoon this week shut down Hong Kong and three Shenzhen terminals. The obvious fix for a shipping backlog is more ships. Ocean carriers are doing close to the opposite — and it's why freight rates are climbing, not falling, at the worst possible time to import anything.
Run the ten-week capacity model
A simplified illustrative model, not real carrier data. Weeks 3–4 simulate a typhoon that forces ports to run at 45% of normal throughput no matter what carriers do. The slider is the lever carriers actually control: how much of the remaining scheduled capacity they choose to cancel on top of that. Demand eases slightly as the modeled rate rises, standing in for price sensitivity. Drag the slider, then press Run to watch ten weeks unfold and see whether the backlog recovers once the storm passes.
The plain version
Picture an airline whose flights are backed up because of a hurricane. You'd think the fix, once the weather clears, is to add extra flights and work through the line of stranded passengers. What airlines — and container-shipping lines — often do instead is cancel even more flights. In shipping, that's called a "blank sailing," and it's happening across the Pacific right now, at about the worst possible moment.
September is on track to be the single busiest month U.S. ports have had all year — the National Retail Federation expects 2.31 million shipping containers to arrive, up nearly 10% from last September, as retailers and electronics importers race gaming consoles, laptops and AI server racks in ahead of the holidays. At the same time, China's ports have taken two typhoons within a month. Typhoon Saudel shut the port of Ningbo for more than three days in late August. This week, Super Typhoon Ragasa — strong enough to trigger Hong Kong's highest storm warning — closed Hong Kong's port and three major Shenzhen terminals, snarling more than 600 ships.
You'd expect shipping lines to throw extra vessels at that backlog. Instead, the big carrier alliances have canceled roughly 1 in 9 of their scheduled sailings across major trade routes over the next five weeks, with more than half of those cuts on the very Asia-to-U.S. route under the most strain. Skipping a sailing lets a ship dodge a jammed port and rejoin its schedule downstream — and, conveniently, it also keeps cargo space scarce, which is what keeps prices from sliding. The result: freight rates from Shanghai to Los Angeles rose 5% last week alone, climbing instead of easing, in the exact month everyone needed the ships the most.
The expert version
Two forcing functions are compounding on the trans-Pacific trade this month, and it's worth separating them. The first is weather: since mid-July, a run of typhoons has hit Chinese port clusters, most recently Typhoon Saudel (Ningbo closed roughly 78 hours, Shanghai's Yangshan terminal roughly 54 hours, Waigaoqiao roughly 48 hours, in late August) and Super Typhoon Ragasa, which made landfall on the South China coast on September 24, triggering Hong Kong's Signal No. 10 warning and idling Shenzhen's Yantian, Shekou and Nansha terminals since September 22 — an estimated 661 vessels across 45 regional ports affected, with a 3-to-7-day cargo delay once terminals reopen around September 26. The cumulative effect: berthing delays at Shanghai and Ningbo have stretched to roughly 10 days, with as many as 90 ships reported waiting more than a week for a slot at Shanghai this week.
The second forcing function is carrier capacity management, and it's the more consequential one economically. Drewry's Cancelled Sailings Tracker shows 79 of 721 scheduled sailings across the major East-West trades blanked between weeks 38 and 42 (mid-September to mid-October) — an 11% cancellation rate, with 52% of those cuts concentrated on the trans-Pacific eastbound lane specifically, and announced blankings for weeks 38–41 jumping roughly 56% week over week as the typhoon disruption unfolded. Blanking a sailing serves two functions at once: operationally, it lets a vessel skip a backed-up berth and re-enter its weekly rotation on schedule rather than idle in a queue accruing demurrage; commercially, it keeps industry-wide capacity tight during a demand spike, which is what allows rates to rise rather than mean-revert.
That second effect shows up directly in the numbers: Drewry's World Container Index has Shanghai–Los Angeles rates climbing from $7,352 to $7,712 per FEU (+5%) between September 10 and 17, and transatlantic rates are up $400/FEU in two weeks to $2,600 — on a lane the typhoons never touched, evidence the capacity discipline extends well beyond storm response alone.
Why it matters for tech + supply chain: this is peak shipping season for holiday electronics and the AI server racks and networking gear flowing into new data centers — exactly when carriers are choosing to keep ships scarce rather than plentiful, so higher freight bills and later deliveries land on Q4 the hardest.
Why it matters for tech + supply chain: when capacity discipline outweighs weather as the driver of elevated rates, the leading indicator isn't the storm forecast — it's alliance blank-sailing announcements, which now function as a real-time signal for trans-Pacific pricing and lead times independent of what the ports themselves are doing.