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• winddirection in degreesmagnetic andwind speed in knots
• altimeter setting (QNH)
• temperature inwhole degreesCelsius
• cloud below 12 500 ft *
• visibility *
• dew point inwhole degreesCelsius
• percentage relativehumidity
• rainfall over the previous tenminutes
*Provided as guidancematerial only. Pilots should exercise cautionwhen
interpreting automated visibility and cloud information as data from these
instrumentsmay not be equivalent tohumanobservations.
Information broadcast from theAWS andWATIR information is considered
to be ‘real time’ data.When information is not available about a particular
item, either because of invalid data or an inoperative sensor, theelement
of thebroadcastwill be identified as ‘CURRENTLYNOTAVAILABLE’; e.g.
‘TEMPERATURECURRENTLYNOTAVAILABLE’.
The integrity of the barometric system inBoM–acceptedAWS is such that
they are an approved source of QNH. Therefore, QNH from theseAWSs
may beused in accordancewithENR1.5 to reduce thepublishedminima
for DME arrival procedures, and the published landing, circling and alternate
minima. Information derived from other sensorswithin theAWS, e.g. wind
and temperature, does not have the same degreeof integrity and shouldbe
used at pilot discretion.
WhenAWIS information is available after the hours of control tower staff and
the aerodrome is uncontrolled, referencewill bemade to its availability in
ATIS ZULU.
The availability of AWIS andWATIR is contained inERSA FAC andMET.
in-flight information
2 – f l i ght i nformat i on serv i ce