Water Vapor, with 500 mb Heights, at 00z, 09/17

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Water vapor image at 00z, 9/17/04. Overlaid on the water vapor image is 0-hr Eta 500 mb heights. Although Ivan remained well separated from the main belt of westerlies at this particular time, note the amplifying short-wave trough over the Dakotas and Nebraska. This short-wave will be a key player later in the event.