anchor.diff:                  "observedPeriod": "PT3H",
                   "pressureChangeInHectoPascal": 2.0,
                   "pressureTendency": "INCREASING_THEN_STEADY",
  +                "pressureTendencyCode": 1,
                   "precipitationAmountInMillimeter": 1.2,
                   "precipitationAmountInInch": 0.047
                 },
  
positive.code: - **PT1H** -    windGustInMeterPerSecond, windGustInKilometerPerHour, windGustInMilesPerHour, windGustInBeaufort, windGustInKnots, precipitationAmountInMillimeter,
                  precipitationAmountInInch
  - **PT3H** -    pressureTendency, pressureChangeInHectoPascal, precipitationAmountInMillimeter,precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour,
                  maxWindGustInMilesPerHour, maxWindGustInBeaufort, maxWindGustInKnots
  - **PT6H** -    precipitationAmountInMillimeter,precipitationAmountInInch, maxWindGustInMeterPerSecond, maxWindGustInKilometerPerHour, maxWindGustInMilesPerHour, maxWindGustInBeaufort,
                  maxWindGustInKnots, pressureTendency
  - **PT12H** -   temperatureMaxInCelsius, temperatureMaxInFahrenheit, temperatureMaxInKelvin, temperatureMinInCelsius, temperatureMinInFahrenheit, temperatureMinInKelvin,
  
negative.code:                 "observedPeriod": "PT3H",
                  "pressureChangeInHectoPascal": 2.0,
                  "pressureTendency": "INCREASING_THEN_STEADY",
                  "pressureTendencyCode": 1,
                  "precipitationAmountInMillimeter": 1.3,
                  "precipitationAmountInInch": 0.051
                },
  