Hi everyone. The odd shapes you're seeing in the cloud cover on Google Earth are not a glitch in the Google Earth software, but a natural side effect of the way the cloud cover data is gathered. We don't have a magic camera that can take pictures of the entire Earth at one time, so global cloud maps are assembled by stitching together several different satellite photos. The "glitches" I've seen so far are just gaps in the satellite photo coverage. These gaps change with time as some of the polar-orbiting satellites move in their orbits and as Google adds or deletes images from various geostationary satellites. It appears to me that whatever source Google uses for their data doesn't always include every satellite. This isn't some new phenomenon -- these gaps have always been there in composite satellite images. We just don't yet have full-time satellite coverage of every spot on the Earth.
Most of the weather satellites are in geostationary orbit over the Earth's equator. At 22,300 miles altitude, these satellites orbit at the same speed as the Earth's rotation, so they basically hover over one location and always see the same portion of Earth. This is very handy for getting continuous weather coverage for most inhabited regions, but these satellites can't quite see the poles. If these were the only satellites available, we'd ALWAYS have gaps at the poles in the global weather maps. Fortunately, there are weather satellites in low-earth orbit running north-south over both poles which can help fill these gaps, but they don't provide constant coverage.

As an example, here's a sketch I threw together to explain the diamond image Sam just posted. It's just a gap in the coverage after stitching together images from four different geostationary satellites. I'm guessing at the satellites in use here, but I'm pretty sure I've got the right ones:

Most of this gap is the result of missing data from GOES-11, stationed over the eastern Pacific and western U.S.
FYI, here's a list of the world's current geostationary weather satellites and their locations:
World Meteorological OrganizationFor a good overview of the world's satellite network, take a look here: (
link)
And finally, just to show that this isn't something that just started happening within the last few days, here's a composite view of the weather over Antarctica from June, 2007:

You can find this image as part of an archive of the past year's Antarctic composite images by following the link at the bottom of
this page. If you browse through the images, you'll see that gaps in the data are very, very common.