Two factors: GOES-EAST cannot view that far west without serious distortion, thus giving the appearance of black regions on the satellite image (e.g. http://www.ssd.noaa.gov/goes/east/catl/avn-l.jpg), while METEOSAT/MSG-1 data are available only every 6hr to the public except by special agreement. Thus, on pages like http://weather.msfc.nasa.gov/GOES/globalir.html, you'll only see images there every 6hr or so. That's a decision made by the European Union nations that are part of the METSAT group.
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Re: AL 962006