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southwest quadrant (Fig. 3). Routine wind information was passed to the Royal
Observatory by the staff at the Tsim Bei Tsui Police Post every three hours
during daylight hours. The Royal Observatory carried out inspection and
maintenance of the anemometer on receipt of reports of malfunctioning.
Hourly wind information was extracted manually from the autographic
record for the three-year period 1975-77 and transferred onto computer cards.
Visual examinations of the autographic record from Tsim Bei Tsui suggest that
anemometer "sticking" occurred from time to time. Periods when gross errors
were noted have been excluded from the data set.
But it is possible that there
is some bias towards speed underestimation in the data. The statistics of wind
speed and direction are given in Table 1. On the understanding that aircraft
will be landing or taking off in directions within the northeast or southwest
quadrants, the statistics of head- and cross-winds for three runway orientations 050°-230°, 060°-240°, 070°-250° are given in Tables 6-8.
>
The possible percentage
utilisations of these runways are given in Tables 9-14. Computer hardware
malfunction was detected during the processing of data.
It has not been possible
However, some checks were made
to rectify the fault within the time available.
and it is believed that the number of light wind (calm) cases could have been
slightly increased.
The wind rose for Tsim Bei Tsui is shown in Fig. 4. For comparison
purposes, the wind roses for Chek Lap Kok and the existing airport are shown in
Fig. 5 and 6 and are based on data from a 24-month period: July 1979 June 1981
(Tables 2-3).
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