: Public <<Enumeration>> Class
Created: 16/04/2012 12:46:22 PM
Modified: 22/06/2015 1:37:56 AM
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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 /></p><p><br /></p><p>Note that the TAC representations for "FM", "TL", and "AT" are represented by the phenomenonTime on the change forecast (MeteorologicalAerodromeForecast):<br /></p><p>    FM and TL - a phenomenonTime with a TimePeriod (start is FM and end is TL)<br /></p><p>    TL - a phenomenonTime with a TimePeriod (start is beginning of forecast validity and end is TL)<br /></p><p>    FM - a phenomenonTime with a TimePeriod (start is FM and end is end of forecast validity)<br /></p><p>    AT - a phenomenonTime with a TimeInstant<br /></p><p><br /></p><p>Design note:<br /></p><p>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 /></p>
Attribute
Public
  BECOMING
Details:
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.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"BECMG"#lt;br /#gt;#lt;/p#gt;
Public
  TEMPORARY_FLUCTUATIONS
Details:
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.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"TEMPO"#lt;br /#gt;#lt;/p#gt;
Public
  FROM
Details:
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.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"FM"#lt;br /#gt;#lt;/p#gt;
Public
  PROBABILITY_30
Details:
Notes: A 30% probability of occurrence of an alternative value of a forecast element or elements.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"PROB30"#lt;br /#gt;#lt;/p#gt;
Public
  PROBABILITY_30_TEMPORARY_FLUCTUATIONS
Details:
Notes: A 30% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"PROB30 TEMPO"#lt;br /#gt;#lt;/p#gt;
Public
  PROBABILITY_40
Details:
Notes: A 40% probability of occurrence of an alternative value of a forecast element or elements.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"PROB40"#lt;br /#gt;#lt;/p#gt;
Public
  PROBABILITY_40_TEMPORARY_FLUCTUATIONS
Details:
Notes: A 40% probability of occurrence of temporary conditions of an alternative value of a forecast element or elements.#lt;br /#gt;#lt;/p#gt;#lt;p#gt;#lt;br /#gt;#lt;/p#gt;#lt;p#gt;ICAO Annex 3 / WMO No. 49-2:#lt;br /#gt;#lt;/p#gt;#lt;p#gt;"PROB40 TEMPO"#lt;br /#gt;#lt;/p#gt;