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Water Vapor, with 500 mb Heights and Vorticity, at 00z, 09/18
Water vapor image at 00z, 9/18/04. Overlaid on the water vapor image are 0-hr Eta 500 mb heights and vorticity. The short-wave, that we had tracked the last 24 hours from the northern Plains into Illinois, has now merged into the main Ivan circulation across WV and western VA.