The one I usually use is noaa.gov (aviation section of course). I would like to subscribe to duats though (duats.com)...duats and calling the local fss for a briefing are the only two (and maybe duat too) that satisfy the requirement of obtaining a wx briefing prior to "...flight under IFR or a flight not in the vicinity of an airport..." (91.103, preflight action)
Also, alot of times, a flight school or FBO will have a computer based weather information service which they subscribe to for pilot use. For example, the FBO I fly out of uses a program called "Aviation Sentry." Just remember that you need to satisfy the requirements of 91.103. And please someone correct me if im wrong about the services being "legal" for this FAR.
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CFII
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