code: def _handleSealvlPressRemark(self, d):
          
          value = float(d['press']) / 10.0
          if value < 50:
              value += 1000
          else:
              value += 900
          if not self.press:
              self.press = CustomPressure(value)
          self.press_sea_level = CustomPressure(value)
docs: Parse the sea-level pressure remark group.