/home/critechuser/cycloneSurge/Python/vtcalc.py:19: FutureWarning: comparison to `None` will result in an elementwise object comparison in the future.
  if lon == None :

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[  0.   9.  21.  33.  45.  57.  69.]
[-20.  -18.3 -17.2 -17.2 -19.1 -21.7 -26. ]

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