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Spacecraft nadir point: 55.7° N, 47.8° W

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Spacecraft Altitude: 240 nautical miles (444km)
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Image Caption: Small scale low pressure systems over low level open cell clouds. The lows we just talked about can be 100s of miles in diameter. Here is an example of a polar jet in the north Pacific spawning weak low pressure systems that are only about 60 miles in diameter. Notice the lower level open cell clouds under the thin cirrus clouds of the jet stream. Open cell clouds often indicate cyclonic motion which is associated with a low pressure trough or circulation. The cirrus and being able to view the clouds underneath is the type of detail which we can document from the orbiter that often can not be seen using regular 4 km or 1 km weather satellite data.