Page GEN 3-5-5 et seq in the UK-AIP lists which airfields pass Average winds and which pass Instant winds.
Whilst my main occupation is as an instructor I work part time as a FISO and the equipment which we have available is only capable of providing Instant winds. If the wind is changing direction significantly or varying markedly in strength, but not at the moment when I pass the wind information to the pilot then I will pass the information as “ the wind is instant xxx at yy knots, within the last x minutes the wind has been variable xxx to yyy, aa gusting bb knots”, otherwise I pass the wind information without stating that the value is an Instant reading.
Last edited by Another_CFI; 12th May 2003 at 16:10.