: Public Class
Created: 23/05/2012 10:03:30 AM
Modified: 21/06/2015 8:24:33 PM
Project:
Advanced:
A specialized Record type containing meteorological conditions for trend forecasting at an aerodrome.  This class is also related but not identical to MeteorologicalAerodromeForecastRecord which is reported on a TAF - conditions reported in trend forecasts in METAR/SPECI differ from forecast groups in a TAF.<br /></p><p><br /></p><p>When no clouds of operational significance or no weather of operational significance is predicted, the NothingOfOperationalSignificance nilReason should be used for the cloud or presentWeather association.  When no clouds were detected by the automatic observing system, the NotDetectedByAutoSystem nilReason should be used for the cloud association.<br /></p>
Attribute
Public ForecastChangeIndicator
  changeIndicator
Details:
sequenceNumber=1
xsdAsAttribute=true
Notes: The change indicator for this trend forecast - becoming, temporary conditions, or no significant change
Public Boolean
  cloudAndVisibilityOK
Details:
sequenceNumber=2
xsdAsAttribute=true
Notes: When true, indicates that the observed cloud ceiling, horizontal visibility, and weather conditions are of no operational significance.  See ICAO Annex 3 / WMO No. 49-2 Section 2.2. Also known as "CAVOK"#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;When CAVOK conditions are observed, no other information on visibility, runway visual range, present weather, cloud amount, or cloud type is reported#lt;br /#gt;#lt;/p#gt;
Public Distance
  prevailingVisibility
Details:
quantity=http://codes.wmo.int/common/quantity-kind/aeronauticalPrevailingHorizontalVisibility
sequenceNumber=4
Notes: The prevailing horizontal visibility reported in a trend forecast
Public RelationalOperator
  prevailingVisibilityOperator
Details:
Notes: The reported relational operator for the prevailing horizontal visibility.  When reported, this operator is reported in conjunction with prevailing visibility.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;To report a prevailing visibility of at least 10000 meters, prevailing visibility is reported as 10000 meters and the operator is reported as "above".  #lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;When no operator is reported, prevailing visibility represents an exact value with identical semantics to other measured quantities#lt;br /#gt;#lt;/p#gt;
Element Source Role Target Role
AerodromeCloudForecast
Class   		Name:  
  		Name: cloud
 
Details:
When no clouds of operational significance are forecast and “CAVOK” is not appropriate ("NSC") it should be indicated by a missing cloud group with a nil reason of nothingOfOperationalSignificance
«DataType» AerodromeSurfaceWindTrendForecast
Class   		Name:  
  		Name: surfaceWind
 
Details:
 
«CodeList» AerodromeForecastWeather
Class   		Name:  
  		Name: forecastWeather
 
Details:
Up to one forecast weather condition.<br /></p><p><br /></p><p>The expected end of occurrence of weather phenomena ("NSW") is indicated by a change forecast with a missing weather group with a nil reason of nothingOfOperationalSignificance<br /></p>
Element Source Role Target Role
«FeatureType» MeteorologicalAerodromeTrendForecast
Class   		Name:  
  		Name: result
 
Details:
 
Constraint Type Status
if( cloudAndVisibilityOK ) clouds == NULL Invariant Approved
Details:
 
if( cloudAndVisibilityOK ) forecastWeather == NULL Invariant Approved
Details: