Eta Cross-Section of PV, Ageo Wind, and Omega, at 12z, 09/16

Outflow into the upper-jet

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This is an Eta 0-hr cross-section of potential vorticity (green contours), omega (shaded, with warm colors showing ascent), ageostrophic streamlines (tan), and ageostrophic wind speeds (light purple contours), all valid at 12z, 9/16/04. Note the strong outflow from near the center of Ivan's circulation (main PV anomaly) upward vertically and northeastward horizontally, feeding the upper-level jet.