Weather

Important note

Whilst racing, weather data or services such as routing that are not free of charge or easily available to all boats are not allowed by Rule 41(c) (outside help) of the RRS. See Case 120 in the Case book. However, Case 120 clarifies that rule 41c may be changed for any particular race by the notice of race and sailing instructions.

What we use ...

Weather Maps and observations

It isn't all about Grib files - weather maps, satellite images and observations are at least as important.

From MyImage, observations in Expedition or Squid.

Another very good service is SailFlow.

Grib data

The best data is almost always that from your local government weather agency. They have more resources and data so should have better products.

Most data is available from Expedition, Saildocs or Great Circle/Squid.

These are what we use:

Global models

GFS

US. Expedition has higher resolution 1/9° hourly data, but Saildocs is available earlier.

ICON

German. Available from Expedition at 1/4° or 1/8° hourly data.

GDPS

Available from Expedition at 1/4° resolution. Data Source: Environment and Climate Change Canada, licence terms

Regional models

Invariably nested inside global or larger regional models.

Expedition WRF

WRF models for areas where there isn't good high resolution forecast data available, such as NZ, UK and Cape Town. Most of Australia, Hong Kong, Japan and the Med are also covered. Some of these are on demand.

Expedition WRF mostly uses the GFS model for initialisation and boundary conditions.

Access

The best model for Australia. Available by subscription from the BOM.

Arome

Often the best model for French waters. Available from Meteo France, Squid or link below.

HIRLAM &  Harmonie

European waters. FMI, KNMI, SMHI and YR.no, available from Squid & MyGrib in Expedition or SMHI link below.

ICON EU & CosmoDE

German. Available from Squid or MyGrib in Expedition.

HRRR & NAM

US and Caribbean. Available from Saildocs and Squid.

Oceanographic models

RTOFS - Global, available from Saildocs and Squid.

MyOcean - Europe, available from Squid.

WW3 - waves

Expedition has integrated current models for various areas.

Tidetech also provides various current products.

Expedition integrated weather & oceanographic data

Free

Expedition eGribs - GFS, ICON, GDPS and high resolution WRF models
Saildocs - GFS, WW3, NAVGEM, COAMPS & RTOFS
KNMI - Hirlam
MailASail
NOAA
NOAA GLERL - Great Lakes winds & currents
Norwegian weather office - Weather forecast from Yr, delivered by the Norwegian Meteorological Institute and NRK
OpenSkiron & OpenGrib
SMN Argentina

Bundesamt für Seeschifffahrt und Hydrographie - Baltic & North Sea tidal currents
Global marine networks

Subscription

Squid (Great Circle) - As used by the Volvo Ocean Race.
Ocens
Predictwind
Theyr

Proudman - UK, North Sea, Mediterranean & Arabian Gulf tidal currents
SHOM - tidal currents for the French coast
Tidetech - global currents
Winning Tides - Solent tidal currents

Other weather & oceanographic grib data

Free

Belgium
DWD - OpenData, COSMO & ICON 
ECMWF, reanalysis & ERA Interim
Environment Canada
Meteo France - Arpege & Arome
MeteoConsult
NCAR/UCAR
NOAA, RTOFS, WW3, Reanalysis, Degrib
SailFlow or SailFlow
Sailing Weather Service
UCAR AMPS
Weather365
Weather 4D Arome

Hong Kong tidal stream data
OSI Sea ice concentration

Subscription

BOM
CloudRun
Frivind
gribfiles.com
Norwegian weather office
Sailtactics
SMHI - Sweden
WetterWelt