Unexpected Storm in the Tasman Sea
sailing19 February 2026

Unexpected Storm in the Tasman Sea

Tasman Sea

Deteriorating weather in the Tasman Sea


Unexpected Storm in the Tasman Sea | Matariki III Log
Massive Tasman Sea swell bearing down on Matariki III's stern
Passage

Unexpected Storm
in the Tasman Sea

West Coast, South Island  ·  19–20 February 2026  ·  Tasman Sea

Date19–20 Feb 2026
AreaTasman Sea / West Coast
Conditions40 kts, steep swell
DecisionBear away for Tasman Bay
CrewGreg, Matt, Brendan, Bruce

The 19th of February delivered the kind of reminder the West Coast does best: things can go from manageable to demanding very quickly, and the sea doesn't negotiate. We were making south toward Milford Sound when the weather ahead of us stopped looking like a forecast and started looking like a fact.

40 kts+
SW — on the nose for Milford
Steep, confused swell
40 kts upwind — Milford
40 kts downwind — Tasman Bay
Bear away. Option B.

The Decision

Two options, neither comfortable. Option one: 40 knots on the nose for the push into Milford Sound. Option two: turn and run 40 knots downwind into Tasman Bay. Milford was tempting — it's the destination, the whole point of being here. But 40 knots upwind on this coast is a long, punishing grind with very little margin. Hard on crew, hard on gear, and if something lets go you're in a bad place a long way from help.

Matt at the helm of Matariki III in 40-knot conditions, large seas astern
Matt on the wheel — managing the ride as the Tasman builds, 19 Feb

Running downwind wasn't exactly relaxing either. At 40 knots the Southern Ocean swell is relentless — wave after wave lifting the stern, the boat accelerating down each face, the helm loaded and alive in your hands. But it was the lower-risk option with far more controllability, a cleaner escape route if the forecast kept deteriorating, and the weight of the sea working with us rather than against us. So we bore away, eased the sheets, and let Matariki find her stride. An Oyster 68 in these conditions is a reassuring thing — the displacement absorbs what the sea throws at her, and once the helm settled into the rhythm of the swell the boat felt purposeful rather than endangered. We were moving fast, and we were in control. That's the margin you need.

When the forecast gives you two bad options, pick the one that preserves margin — for people first, then gear, then schedule.
Matt at the helm scanning the horizon in heavy Tasman Sea conditions
Matt on watch — eyes on what's coming
Large breaking wave over Matariki III's stern in the Tasman Sea
What 40 knots looks like from the cockpit

Downtime Well Used

Once we were tucked in and the boat was settled, we used the window properly. Not waiting — working. Three jobs that had been queued up by the passage north found their moment.

First up was Brendan, who pulled the steering hatch and disappeared into the lazarette for a thorough inspection of the steering system. This is the sort of job that is very easy to defer in fine weather and very hard to think about clearly when you're already in trouble. Satisfied with what he found, which is exactly the outcome you want.

Brendan inspecting the steering system in the lazarette hatch on deck
Brendan — steering inspection while the sea lets us breathe

On deck, Matt and Bruce spread the yankee out and got into the seam tape that had been lifting at the seam — the kind of small defect that starts as an annoyance and ends as a problem if you leave it long enough. Gloves on, adhesive out, two of them working methodically along the length of the sail in the sunshine. Tasman Bay turned out to be an excellent sail repair facility.

Matt and Bruce taping the unstuck seam on the mainsail spread out on deck in Tasman Bay
Matt and Bruce — taping up the sail seam while the conditions allow

And then there was Bruce's danbuoy. Earlier in the passage, while landing his bigeye tuna off Cape Reinga, he'd managed to knock the inflatable danbuoy overboard in the excitement. Recovered, but needing a full repack and rearm before it could go back on the rail as a functioning piece of safety gear. Bruce spent the afternoon on the saloon floor with the canister disassembled around him — cordage, gas cartridge, fluorescent yellow fabric going in all directions — methodically working through the repack procedure. The danbuoy went back on the rail ready to deploy. Job done.

Bruce repacking the inflatable danbuoy on the saloon floor after it went overboard during the Cape Reinga tuna fight
Bruce repacking the danbuoy — the price of a good fish fight

There is a particular satisfaction in arriving somewhere with the boat genuinely ready — not just functional, but attended to. The forecast improved on the 20th and we repositioned south when the window opened. The detour had cost us a day but gained us confidence in the boat and the crew, a tidy job list, and the knowledge that the decision made under pressure had been the right one. Milford Sound would wait. It always does.

Log Note — Seamanship

When the forecast gives you two bad options, pick the one that preserves margin — for people first, then gear, then schedule. No hero moves on the West Coast of the South Island.