4
SUNDAY, NOVEMBER 17, 1985
TYPHOON DOT ENTERED THE SOUTH CHINA SEA ON OCTOBER 19 AFTER CROSSING LUZON. UNDER THE COMBINED EFFECTS OF DOT AND THE WINTER MONSOON, STRONG NORTHERLY WINDS WERE EXPERIENCED OFFSHORE AND IN EXPOSED PLACES IN THE EARLY MORNING OF OCTOBER 20.
THE ANTICYCLONE OVER CHINA INTENSIFIED AND WINDS REMAINED STRONG ON OCTOBER 21.
THE WEATER ON OCTOBER 20 AND 21 WAS CLOUDY WITH PERIODS OF RAIN. ON OCTOBER 20 THE TEMPERATURE DROPPED TO A MINIMUM OF 20.3 DEGREES, THE LOWEST OF THE MONTH.
APART FROM SOME LIGHT RAIN WINDS MODERATED ON OCTOBER 22. PATCHES ON OCTOBER 24 AND FROM OCTOBER 27 TO 29, FINE WEATHER SET IN AND PREVAILED UP TO OCTOBER 31.
A SURGE OF THE WINTER MONSOON ARRIVED IN HONG KONG ON OCTOBER 31. WINDS TURNED NORTHERLY AND THE WEATHER BECAME DRY WITH THE RELATIVE HUMIDITY FALLING BELOW 55 PER CENT.
DURING THE MONTH NO AIRCRAFT WERE DIVERTED FROM HONG KONG DUE TO ADVERSE WEATHER.
THE RED FIRE DANGER WARNING WAS IN EFFECT ON OCTOBER 6 AND 22, WHILE THE YELLOW FIRE DANGER WARNING WAS IN EFFECT ON OCTOBER 4 5, 13, 19, 20 AND 27.
NO THUNDERSTORM WARNINGS WERE ISSUED DURING THE MONTH.
SIX TROPICAL CYCLONES OCCURRED OVER THE WESTERN NORTH
PACIFIC AND THE SOUTH CHINA SEA.
TROPICAL CYCLONE AND MONSOON SIGNALS HOISTED DURING OCTOBER WERE AS FOLLOWS:
WEATHER
SIGNAL
SYSTEM
DATE AND TIME OF HOISTING
DATE AND TIME OF LOWERING
TYPHOON DOT
1
OCT 20 9.50 AM
OCT 21 5 AM
WINTER MONSOON
STRONG
OCT 21 5 AM
OCT 22 5 AM
MONSOON
THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE:
SUNSHINE
RA INFALL
CLOUD INESS
RELATIVE HUMIDITY
218.2 HOURS - 8.3 HOURS ABOVE NORMAL
56.1 MM - 65.1 MM BELOW NORMAL
54 PER CENT = 2 PER CENT MORE THAN
NORMAL
76 PER CENT 4 PER CENT HIGHER
-
THAN NORMAL
/MEAN MAXIMUM