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Weather

The wind your route is computed in: the weather models, how fresh their forecasts are, and their routes side by side.

Latest article No. 29Weather

Gusts and waves along the route

The mean wind sets the route, the gusts the reef and the sea the comfort: routes now show the gusts and the waves they will meet.

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October 2026

  1. No. 28Weather

    How AI weather models work

    Three of the models behind a route solve no equation of physics: they learnt the weather from its past. How they work, and how far to trust them.

  2. No. 27Weather

    AIGFS, NOAA's machine-learned forecast

    Started from the same weather as GFS but learnt by machine: where AIGFS and GFS part, the doubt lies in the forecast, sixteen days ahead.

September 2026

  1. No. 26Weather

    AICON, a forecast learnt from ICON

    A machine-learned model that starts from ICON's own picture of the weather: where AICON and ICON part, the doubt lies in the forecast itself.

  2. No. 25Weather

    ICON-2I, Italy's 2 km model over its seas

    From Corsica to the Ionian Sea, from Malta to the head of the Adriatic, ItaliaMeteo's ICON-2I draws the wind of Italy's seas at 2.2 km.

  3. No. 24Weather

    HARMONIE DINI, 2 km from Iceland to the Adriatic

    Norway's fjords, Shetland, the Faroes, Iceland and the Gulf of Finland now have a 2 km model of their own: HARMONIE DINI, run by four nations.

  4. No. 23Weather

    RRFS, NOAA's fine model, over American waters

    Sea breezes along the American coasts and trade winds squeezed between the Hawaiian Islands: NOAA's RRFS now sees them at 2.5 to 3 km.

August 2026

  1. No. 21Weather

    ECMWF AIFS, a forecast learnt by machine

    Weather models share the same physics, and can be wrong together: ECMWF AIFS, learnt from past weather by machine, gives a second opinion.

  2. No. 19Weather

    The Data page: all that a route rests on

    Is the forecast fresh, does it reach your arrival, is your passage in a fine model's area? The Data page answers before you trust a route.

June 2026

  1. No. 13Weather

    Comparing the models, instant by instant

    Several routes on a map, but which one is ahead, and where do they part? The models are now ranked, and a time cursor sails them side by side.

  2. No. 10Weather

    Forecasts that keep themselves up to date

    A route on yesterday's forecast ignores what forecasters have learnt since: every new run is now downloaded on its own, soon after it is published.

May 2026

  1. No. 9Weather

    ICON, the German weather service's model

    Another centre's opinion, finer and finer towards Germany's seas: ICON gives three routes, from the whole globe down to 2 km.

  2. No. 8Weather

    AROME, from the French coast to the islands

    Global models cannot see what a coast or an island does to the wind: Météo-France's AROME does, at 1.3 km around France and 2.5 km overseas.

  3. No. 6Weather

    ARPEGE, Météo-France's global model

    A global model with a zoom on France: ARPEGE, and its finer grid out to the Azores and the Canaries, adds two routes in European waters.

April 2026

  1. No. 4Weather

    ECMWF, the European Centre's forecast

    Days ahead, which forecast puts the lows and the fronts in the right place? ECMWF's model, the forecasters' reference, now gives a route of its own.

  2. No. 3Weather

    Several weather models, one route each

    No forecast is right every time: ECMWF, ARPEGE, AROME and ICON join GFS, and one computation gives a route per model to compare.

  3. No. 2Weather

    GFS, the forecast that reaches across an ocean

    An ocean crossing outlasts most forecasts: NOAA's GFS sees sixteen days ahead, far enough to plan a passage from its first mile to its last.