We left Bandol on a soft morning with a forecast we had half-read and half-believed. By noon the wind had clocked into the north-west and the boat was heeling under a single reef when she should have been ghosting along under full main. By two o'clock I had the second reef in, a handkerchief of headsail out, and a decision to make that every visiting sailor in Provence makes sooner or later: do I run for a hole, or do I settle in and take what is coming?
That is the real question once a Mistral has you. Not how to read it in advance, which I have written about in the Mistral reading guide before it traps you, but what to do when the planning has already failed and you are out there in it. The honest answer is that it depends on three things: how far you are from real shelter, what the sea is doing, and how the wind is trending. Get those three readings right and the decision usually makes itself.
First, take the boat's measure
Before you decide anything, stabilise. Reef hard and early. A Mistral gusts viciously, so a boat that would happily carry full main in a steady 25-knot Atlantic blow wants two reefs and a scrap of jib here, because the gusts can punch 15 knots above the mean in seconds. Over the Gulf of Lion the Mistral routinely sustains above 40 knots, and in the worst events gusts have been recorded near 100 knots over exposed ground. You will rarely see those extremes inshore, but the point stands: leave margin.
Once she is balanced and you are no longer fighting the helm, you can think. A boat that is overpressed and rounding up is no place from which to make a calm decision.
The case for running
Running for shelter is almost always right when two conditions are met: there is a genuinely sheltered harbour or anchorage within reach before dark, and the leg there does not put you on a lee shore or force you to beat into a building sea.
The Mistral builds a short, steep, dangerous sea over the Gulf of Lion faster than newcomers expect, because the water over the shelf is relatively shallow and the fetch off the land is long. Two metres of confused Mediterranean chop with five seconds between crests is far nastier than two metres of Atlantic swell rolling through at ten seconds. If the sea is already short and breaking, get off the water.
Pick your bolthole for the wind that is blowing, not the one you wish was blowing. South-facing bays behind high ground are the prize. The cliffs of the Calanques between Marseille and Cassis knock the swell flat in places like Port-Miou, and the south coasts of the Hyeres islands sit in the lee of their own hills. A proper marina is the conservative default, because a multi-day Mistral can outlast your ground tackle and your nerve together.
The case for riding it out
Sometimes running is the worse option. If your only downwind escape is an exposed lee shore, or every harbour within reach faces north-west, you may be safer staying at sea and giving the coast a wide berth. The open Gulf of Lion is unpleasant in a Mistral, but a rock-strewn lee shore at night is lethal.
Riding it out means making the boat safe and getting sea room. Heave to if she will lie quietly, or run off under scrap of canvas on a course that opens water between you and the land. The classic embayment mistakes happen when a tired crew claws towards a harbour they cannot quite reach and ends up pinned against the coast with no room to manoeuvre. If in doubt, head out, not in.
There is a timing argument for waiting, too. The Mistral often eases overnight and rebuilds in the morning, and its average daytime strength sits around 27 knots rather than the gale-force peaks. If you are comfortable offshore and the worst gusts come in the afternoon, sometimes the smart play is to stand off, let the evening lull arrive, and make your approach to shelter when the wind drops a notch.
Reading the trend
The single most useful thing you can do mid-Mistral is work out whether it is building or easing. Three pointers help.
- The forecast you should already be listening to. The Meteo-France marine bulletins for the Gulf of Lion will name the Mistral and give its expected force and duration. A Mistral can blow for a day, but three to five days is common and a full week is not unheard of, so a bulletin that says "establishing" means do not gamble on a quick lull.
- The barometer, used backwards from what you know at home. The Mistral comes on a rising glass, so a climbing barometer here is not the reassurance it would be in the Channel. A sharp rise after a low, with the air going glass-clear, means the wind is filling, not fading.
- The sky and the sea. If visibility is extraordinary and the mountains behind the coast are knife-sharp, the Mistral is in full flow. When the air starts to soften and haze creeps back, the pattern is breaking down.
For the practical side of finding and decoding these bulletins as an English speaker, our guide to French marine weather forecasts in English walks through the channels and the timings.
The anchorage you are sitting in may be the problem
Plenty of crews get caught by the Mistral not under way but at anchor, on a calm evening that turns ugly in the small hours. The danger is that the popular spots are often the exposed ones. The north coasts of the Hyeres islands, off Porquerolles and Port-Cros, give lovely shelter from the southerly sea breeze that fills on a normal afternoon and then sit fully open to the north-west when the Mistral arrives. A bay that was glassy at sunset becomes a 40-knot lee shore by three in the morning, with a short steep sea breaking onto the beach behind you and your anchor dragging across sand that was holding fine in ten knots.
If you are already anchored when a Mistral is named in the bulletin, treat shifting berths as part of the seamanship rather than an inconvenience. Move to a bay sheltered behind high ground to the north, or to a port, before dark. A buoy or anchor that is comfortable now tells you nothing about how it will behave once the funnel switches on, and dragging at night onto a lee shore is exactly the scenario that turns a manageable blow into a rescue.
If you do stay at anchor and elect to ride it out there, lay plenty of scope, set an anchor alarm, and keep an anchor watch through the worst of it with the engine ready to start. The moment the boat starts to drag towards the shore, motor up and out into clear water rather than fighting to reset on a lee shore in the dark.
When the decision is taken out of your hands
If the boat is being overwhelmed, if someone is hurt, or if you are being set down on a lee shore you cannot escape, stop weighing options and call for help. In French waters you raise CROSS, the rescue coordination centres, on VHF channel 16, and the full procedure including the French phrases is set out in our guide to the French distress and safety call procedure. Rescue of people is free in France under the 1979 international convention. Towing a disabled but safe boat is a separate, paid service: the SNSM typically invoices between 340 and 700 euros depending on the boat and the means used, which is a powerful reason to fix your own problems while you still can.
Do not let pride delay a Pan-Pan. A timely call when you still have options is seamanship; a Mayday when you are already on the rocks is a confession.
What I should have done off Bandol
That day I got lucky. The wind was still building, but I was close enough to a south-facing anchorage tucked under high ground that running was clearly right, and I made it in before the sea got truly ugly. The lesson was not about heavy-weather technique. It was that I had let myself get into the position of deciding at all, when a proper read of the bulletin that morning would have kept me in harbour with a coffee.
If the Mistral catches you anyway, decide cleanly. Reef hard, take the boat's measure, then choose run or ride on the three readings: distance to safe shelter, what the sea is doing, and whether the wind is building or easing. The sailors who come unstuck are the ones who freeze in the middle, half-committed to a harbour they cannot reach and half-resigned to a sea they have not respected. Pick one, and sail it like you mean it.
