Litt googling gav meg;
f.eks fra
ippc.no
Quote:
Trend is a short forecast given in METAR, and is used to advise expected changes within the two hours following the observation. Only approved aerodromes are allowed to use TREND in METARs. In such cases as a TREND is used in the METAR, three keywords will be used:
BECMG/TEMPO/NOSIG
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(Og disse blir pertentlig beskrevet som følgende: )
Quote:
NOSIG: No significant change expected within the next two hours.
TEMPO indicates that there is forecast a temporary change to the weather given after the TEMPO group.
BECMG (becoming) indicates at least 50% chance of a gradual transition to longer lasting changes from the weather in the main part of the METAR.
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