Model Loop
400-100 hPa Potential Vorticity (PVU), 250 hPa Height (dam, black) and Wind (kt), 925-850 hPa Rel. Vort. (10^-4 s^-1)
PV: -120 -108 -096 -084 -072 -060 -048 -036 -024 -012 f000 f012 f024 f036 f048 f060 f072 f084 f096 f108 f120