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 or observations in Expedition or your local met office.

Another very good service is SailFlow.

Grib data

Global models

GFS

US. Available from Expedition, Saildocs or Great Circle. Saildocs is available earlier, but Expedition has hourly data.

ICON

German. Available from Expedition or Great Circle.

GDPS

Canadian. Also known as GEM. Available from Expedition and Great Circle.

NAVGEM

US Navy. Available from Saildocs.

ECMWF

European. Expensive and can be hard to get.

Arpege

French. Only available at lower resolution. Available from Great Circle, but I don't know a lot about it.

Regional models

Invariably nested inside global or larger regional models.

NAM

US. One of the best for the US. Sources include Great Circle and NOAA.

Arome

Meteo France. Probably the best model for Europe and the western Mediterranean. Available from Great Circle or link below.

Harmonie

KNMI. Also reputed to be very good. Available from Great Circle or MyGrib in Expedition.

ICON EU & CosmoDE

Germany. A lot of people like these. Available from Great Circle or MyGrib in Expedition.

WRF

WRF models are almost a dime-a-dozen, but they can be very good. Examples include the NOAA HRRR.

The Expedition WRF is one of the best of course.

SMHI

Swedish. Link below.

Yr.no

Norwegian. Available from MyGrib in Expedition.

Access

Australian. Good, available by subscription from the BOM.

Oceanographic models

...

Expedition integrated weather & oceanographic data

Free

Expedition eGribs - GFS, ICON and high resolution WRF models
Saildocs - GFS, WW3, NAVGEM, COAMPS & RTOFS - designed to satisfy Rule 41(c)
Great Circle - Squid - Many global & regional models. As used by the Volvo Ocean Race.
GLERL - Great Lakes winds & currents 
MailASail - GFS
NOAA - GFS, GEFS, NAM, RTOFS etc
Norwegian weather office - Weather forecast from Yr, delivered by the Norwegian Meteorological Institute and NRK
OpenSkiron & OpenGrib - Regional models

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

Subscription

Great Circle - Many global & regional models. As used by the Volvo Ocean Race.
Ocens - Global and regional models
Predictwind - Regional models

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

Other weather & oceanographic grib data

Free

DWD - OpenData, COSMO & ICON - Global & Europe
ECMWF, reanalysis & ERA Interim
Environment Canada - GDPS Global & North America
Meteo France - Arpege Global & Arome Europe
MeteoConsult - Europe
NCAR/UCAR Research data archive
NOAA, RTOFS, WW3, Reanalysis, Degrib
SailFlow or SailFlow - GFS, NAM & WRAMS
Sailing Weather Service - SWS, NAM and GFS
UCAR AMPS - Antarctic Mesoscale Prediction, incl NZ
Weather365 - ETA Europe
Weather 4D - Arome

Hong Kong tidal stream data
OSI Sea ice concentration

Subscription

BOM - Australia
CloudRun - custom WRF models
Frivind
gribfiles.com
Norwegian weather office
Sailtactics - San Francisco & the Solent
WetterWelt GmbH