Blocking patterns setting up, as seen on water vapour satellite loops
This page shows the satellite imagery over the eastern Pacific Ocean during a time when blocking patterns were setting up. The upper ridge was building up to the north of a cut-off low which was sitting there and spinning.
This formed what is known as a high over low block, a pattern that blocks all but the most vigourous attempts at moving any kind of weather through the area.
Click here to see the first satellite animation
Click here to see the second satellite animation
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Last update to this page: September 17, 2005