For passage planning I use the following as well.
NOAA weather fax
Both are available from Internet, but offshore weatherfax can be accessed via SSB > Modem > laptop and GRIB files can be accessed via email either SSB or Sat Phone. GRIB readers run the whole gamut of cost from free (UGRIB) to expensive (Expedition)
Get familiar with them at home online.
I use the North East Pacific weather fax
Northeast Pacific WX Briefing Package
For Internet based GRIB files I use UGRIB
For email based GRIB files see Requesting grib files from Saildocs (2010-07-08)
I also have a slew of Android apps that I use for weather.
Also if you are going to cross the Gulf Stream, you may wish to use a routing service.
There are also weather routing services both free and for fee available.