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Bulletin updated at 00:45 HKT 25/Jun/2018

Here is the latest weather bulletin issued by the Hong Kong Observatory.

A southerly airstream brought showers to the coastal areas of Guangdong yesterday. Locally, it was mainly cloudy with sunny intervals and a few showers. There were thunderstorms last night. More than 10 millimetres of rainfall were recorded at many places over the territory. A southerly airstream is expected to bring showers to the coast of Guangdong and the northern part of the South China Sea today and tomorrow.

Weather forecast for Hong Kong

Mainly cloudy with showers and a few squally thunderstorms. Temperatures will range between 26 and 30 degrees. Moderate south to southeasterly winds, gusty at times.

Outlook : Showers will ease off in the following couple of days. Fine and very hot in the middle and latter parts of this week.

(The above forecast period is valid up to 23:59 HKT today, 25/06/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

South China Coastal Waters

Weather Forecast for Local Aviation

I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS BRINGING UNSETTLED
     WEATHER TO THE SOUTH CHINA COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  150/15-20                            26-29
   B.   2000 FT:  160/15-20, OCNL 25                   22
   C.   5000 FT:  160/15-20                            18
   D.  10000 FT:  170/20                               11
   E.  18000 FT:  160/10                               MS4
   F.  24000 FT:  120/10                               MS15
   G.  30000 FT:  050/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS. ISOLATED SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 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: 17500 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND NEAR HILLS. MOD OFFSHORE.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHEASTERLY WINDS. MAINLY
     CLOUDY WITH SHOWERS AND ISOLATED SQUALLY
     THUNDERSTORMS.=

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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
===================================================================

Aviation Weather Observation and Forecast Information for Hong Kong International Airport

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

Significant Weather Information (SIGMET)

The Airport Meteorological Office is responsible for monitoring hazardous weather and phenomena in the atmosphere that may affect the safety of aircraft operations within a designated airspace over the northern part of the South China Sea. Weather forecasters at the Airport Meteorological Office issues SIGMET information when hazardous weather and phenomena in the atmosphere such as thunderstorms, tropical cyclones, turbulence, icing occur or are expected to occur in the airspace.

Please click here for more about the SIGMET