250 mb Analyses (Heights, Divergence, and Wind Speed) + 850 mb Wind Barbs, at 12z, 09/17

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Eta 0-hr analyses of 250 mb heights (green contours), wind speeds (shaded), and divergence (white contours). Tan wind barbs represent Eta 0-hr 850 mb winds. All analyses are for 12z, 9/17/04. The northern jet maximum has intensified in the last 12 hours (to 140+ kt), with a corresponding increase in the strength of the upper-level divergence within its right-entrance region.