Trends in a METAR may only be included if it is written by a forecaster and not an observer. There may be a trend on the way, but it may not be reported as there may just be an observer on duty. When I was taught to read them many years ago, we were told that if there is no trend statement, then the METAR should be considered valid for one hour only.
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= trend.
two hours or NOSIG |
The part I dont understand is if a METAR which is a report issued every 30 or 60 mins, is issued with a TTF, which in AUS is valid for 3 hours, what happens to the validity of that same TTF when the metar is updated in 30 mins time? Trends in a METAR may only be included... that if there is no trend statement, then the METAR should be considered valid for one hour only. |
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