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