code: def ws45(msg):
      
      d = hex2bin(data(msg))
      if d[3] == '0':
          return None
  
      ws = bin2int(d[4:6])
      return ws
docs: Wind shear.
  
      Args:
          msg (String): 28 bytes hexadecimal message string
  
      Returns:
          int: Wind shear level. 0=NIL, 1=Light, 2=Moderate, 3=Severe