Weather Forecast for Local Aviation

I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A TROUGH OF LOW PRESSURE IS BRINGING SHOWERS AND
     THUNDERSTORMS TO GUANGDONG. THE TROUGH OF LOW
     PRESSURE IS EXPECTED TO MOVE NORTHWARDS
     GRADUALLY AWAY FROM THE COASTAL AREAS.
     MEANWHILE, A SOUTHERLY AIRSTREAM IS AFFECTING
     THE SOUTH CHINA COASTAL AREAS
     AT 4 P.M., TROPICAL STORM CHOI-WAN WAS LOCATED
     NEAR 13.4 DEGREES NORTH, 121.3 DEGREES EAST. IT
     IS FORECAST TO MOVE NORTH-NORTHWEST AT ABOUT 12
     KNOTS ACROSS THE PHILIPPINES.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND (DIRECTION/KNOT)          TEMPERATURE (DEG. C)
   A.   SURFACE:  170/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  180/10-15                            30-27
   B.   2000 FT:  180/15-20, OCNL 25                   23
   C.   5000 FT:  200/20                               21
   D.  10000 FT:  250/20                               13
   E.  18000 FT:  270/15                               MS3
   F.  24000 FT:  270/15                               MS11
   G.  30000 FT:  250/15                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY. ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT SCT 2500 FT
      TEMPO FEW CB 1000 FT SCT 2000 FT BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND  NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     CLOUDY PERIODS. ISOLATED SHOWERS.=

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Note: The forecast could be updated before the next issue time 
whenever there is newly expected occurrence or non-occurrence 
of significant weather as described below which may be hazardous 
to aircraft within 100-km radius of Hong Kong:

(a) Change of the tropical cyclone category
(b) Strong, Gale, Storm, and Hurricane force winds
(c) Thunderstorm/CBs
(d) Severe gusts
(e) Severe turbulence
(f) Significant low stratus
(g) Fog or thick haze/sandstorm/duststorm 
    causing significant reduction of visibility
(h) Volcanic ash
(i) Radioactive cloud
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Aviation Weather Observation and Forecast Information for Hong Kong International Airport

To know more about clouds, please see Commonly observed clouds in Hong Kong.