TIROS photographs of cloud patterns in the vicinity of thc jet stream are examined and comparcd with surface, uppcr air, and pilot-report data. It is found that with certain conditions of lighting and satellite attitude the northern edge of the cirrus cloud shield, which lics immediately south of the jet, can be casily identified by a shadow cast by the higher cloud dcek on the loner underlying surface. This shadow ideiitifics the cloud structure associated with the jet strcam. Differences in texturc aiid pattern also help to identify the northcrii limits of the high-level cirrus and thus aid in positioning thc jet stream.
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