 Surfline
Surfline is the most comprehensive surf forecasting and reporting website on the internet. They have a great tool called LOLA, which is remarkably accurate in its wave height, period, and wind direction models.
* Subscription required
Wavewatch
Brand new website with a tremendous wind, wave, and period forecast for Sumatra. Very high tech, easy to use, provides a fantastic visual display for many areas including Sumatra.
Buoyweather
This is a very accurate and easy to read 4 day forecast measured by the most relevant Mentawai buoy. An extended 7 day forecast is available on a subscription basis. This site also boasts great local wind information.
NOAA Wave Height Animation
168 hour forecast covering the entire Indian Ocean in a spherical format. This is what all of the other websites use for their data, just not as fancy. If you want a quick, easy to understand link, this is it.
NOAA Wave Period Animation
168 hour forecast covering the entire Indian Ocean. This link provides a simple to understand wave period animation. The longer the wave period the more spots waves can sneak into, especially in the Mentawai.
Wetsand
This is one of the most impressive, free Indonesian surf reports on the internet. It's got accurate wave height, period, wind, and tide information in an easy to read format.
 Oceanweather
A series of in depth graphics covering wave height, marine observations, and even sea temperature across the entire Indian Ocean. Takes a little longer to load than the others but is definitely worth the wait.
METEOSAT-5: Satellite Image
A remarkably detailed satellite animation of the Indian Ocean region. Make sure you check out the "zoom" feature. This will show you basic storm patterns and wind shifts along the Equator.
METEOSAT-5: Enhanced Satellite Image
Practically the same animation as above but in an easier to read enhanced color format. This satellite enables you to see clouds and precipitation a lot easier than the original.
Stormsurf
Mark Sponsler at Stormsurf has put together an extremely comprehensive list of swell and weather links for the Indian Ocean region here. It seems as though he's covered everything we have times 2.
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