anchor.diff:  For multiple locations, its recommended to just use the point compression.
   The observations in the response collection are "flat" to allow easy streaming and filtering on client side.
   The observations in the response are ordered ascending by field 'observedFrom'.
  -The pressureTendency field returns string values based on the following table:
  +The pressureTendencyDescription field returns string values based on the following table:
   
   WMO table 010063: CHARACTERISTIC OF PRESSURE TENDENCY
    
  
positive.code:                 "observedUntil": "2016-10-15T08:00:00Z",
                  "observedPeriod": "PT3H",
                  "pressureChangeInHectoPascal": 2.0,
                  "pressureTendency": "INCREASING_THEN_STEADY",
                  "pressureTendencyCode": 1,
                  "precipitationAmountInMillimeter": 1.2,
                  "precipitationAmountInInch": 0.047
  
negative.code:                 "precipitationAmountInInch": 0.02,
  				"freshSnowfallInCentimeter": 1,
  				"freshSnowfallInInch": 0.394,
  				"pressureTendencyDescription": "STEADY",
                  "pressureTendencyCode": 4
                },
                {
  