: Public <<enumeration>> Class
Created: 20/10/2015 3:33:09 PM
Modified: 29/04/2016 3:23:25 PM
Project:
Advanced:
The forecast change indicator type, including temporary, permanent, or probable conditions.  This is an extension of ForecastChangeIndicator that includes report-specific entries, and in particular the 30 and 40% probability conditions.<br/><br/>Note that the TAC representations for "FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast):<br/>    FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL)<br/>    TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL)<br/>    FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity)<br/>    AT - a phenomenonTime with a TimeInstant<br/><br/>Design note:<br/>These values represent the operationally-representable types, but are not very general-purpose.  Especially with temporary conditions and probability it might be better to turn these into a "probability" property and constraints could be applied to the value to match operational constraints<br/>
Attribute
Public
  BECOMING
Details:
sequenceNumber=1
Notes: Conditions are expected to reach or pass through specified threshold values at a regular or irregular rate and at an unspecified time during the time period.  The time period should normally not exceed 2 hours but in any case should not exceed 4 hours.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"BECMG"<br/><br/>
Public
  TEMPORARY_FLUCTUATIONS
Details:
sequenceNumber=2
Notes: Expected temporary fluctuations to meteorological conditions which reach or pass specified threshold criteria and last for a period of less than one hour in each instance and in the aggregate cover less than half of the forecast period during which the fluctuations are expected to occur.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"TEMPO"<br/>
Public
  FROM
Details:
sequenceNumber=3
Notes: One set of prevailing weather conditions is expected to change significantly and more or less completely to a different set of conditions. Conditions in a FROM group supersede conditions in earlier groups.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"FM"<br/>
Public
  PROBABILITY_30
Details:
sequenceNumber=4
Notes: A 30% probability of occurrence of an alternative value of a forecast element or elements.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"PROB30"<br/>
Public
  PROBABILITY_30_TEMPORARY_FLUCTUATIONS
Details:
sequenceNumber=5
Notes: A 30% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"PROB30 TEMPO"<br/>
Public
  PROBABILITY_40
Details:
sequenceNumber=6
Notes: A 40% probability of occurrence of an alternative value of a forecast element or elements.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"PROB40"<br/>
Public
  PROBABILITY_40_TEMPORARY_FLUCTUATIONS
Details:
sequenceNumber=7
Notes: A 40% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements.<br/><br/>ICAO Annex 3 / WMO No. 49-2:<br/>"PROB40 TEMPO"<br/>