TEMPO in WX forecast?
Was having a bit of a discussion with an Instructor Pilot the other week.
I had always considered "chance of" under the old FAA wx forecast, or "TEMPO" in the current version, to be a valid/binding condition at the destination or for choosing an alternate airport or required fuel. His position was that I had been doing it wrong for years, and chance/TEMPO was so short term, that it did not matter per the regs, and that LEGALLY (not talking about good conservative practices) no fuel had to be included to account for the condition actually happening.
My position is that if you arrive, and the "temporary" below minimums wx that was forecast has occurred, you did not take off with the legal amount of fuel.
FAA says you need fuel "considering weather reports and forecasts and weather conditions"
"TEMPO: Indicator of temporary fluctuations to forecast
meteorological conditions which are expected to last less than
1 hour in each instance and, in the aggregate, to cover less than
half of the indicated period. In general, the period of time
covered by a TEMPO group should not exceed 4 hours."
So is TEMPO a valid forecast consideration, or is it just for background info, and is not legally binding?
Not really looking for opinions, but does anybody have any references to regulations for USA, Europe, or China/Asia?