Fig. 3.  Water vapor satellite imagery, the 00 h 1800 UTC 30 April Rapid Update Cycle (RUC) 950 mb moisture convergence (dark blue every 1 x 10-7 s-1) and 300-400 mb layer potential vorticity (light green every 0.25 PVU).  Only moisture convergence is shown at 950 mb.
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