SOUTH CHINA COASTAL WATERS
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South China Coastal Waters

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Bulletin issued at 19:30 HKT 21/Apr/2018

Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 21 April 2018

Weather Situation:
A southeasterly airstream is affecting the south China coastal waters.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
Southeast force 4, occasionally force 5.
Isolated showers.
Moderate seas.

Nan'ao and Shanwei:
East to southeast force 4 to 5.
Moderate seas.

South of Hong Kong and Shangchuan Dao:
Southeast force 4 to 5.
Moderate seas.

Outlook for the next 48 hours
South to southeasterly winds of force 4 to 5, occasionally force 6, becoming north to northeasterly winds of force 5 to 6 later. Isolated showers and squally thunderstorms later.

Latest reports from south China coastal weather stations
--------------------------------------------------------

Waglan Island Wind east-northeast force 3
  Visibility 8 Kilometres

Shantou Wind east-southeast force 2
  Visibility 23 Kilometres

Huangmaozhou Wind east force 5

Macau Wind east-southeast force 2
  Visibility 7 Kilometres

Xisha Wind east-southeast force 2
  Visibility 28 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 21/APR/2018
    (Next update at 01:30 HKT 22/APR/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10
       OFFSHORE:  090/15-20                            26-24
   B.   2000 FT:  150/15-20                            20
   C.   5000 FT:  190/15                               18
   D.  10000 FT:  250/25                               9
   E.  18000 FT:  270/25                               MS7
   F.  24000 FT:  290/35                               MS17
   G.  30000 FT:  290/50                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.
   K. VISIBILITY    : 9 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 14000 FT      10 DEG. C LEVEL(S) : 9800 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHEASTERLY WINDS.  SUNNY PERIODS.
     ONE OR TWO ISOLATED SHOWERS IN THE MORNING.=

    ===================================================================
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.

    sigmet
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    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.

    The latest significant weather information
    issued by the Hong Kong Observatory at 13:35 HKT on 15 Apr 18

    VHHK SIGMET 3 VALID 150345/150745 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11130 - N2124 E11130 - N2230 E11342 - N2336 E11712 - N2242 E11712 - N2000 E11130 - N2000 E11130 TOP FL400 MOV NE 15KT NC= VHHK SIGMET 5 VALID 150535/150935 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2248 E11442 - N2342 E11730 - N2248 E11730 - N2154 E11442 - N2248 E11442 TOP FL400 MOV NE 15KT NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    YESTERDAY'S WEATHER AND RADIATION LEVEL Skip to main content
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    Yesterday's Weather and Radiation Level

    Bulletin issued at 00:15 HKT 21/Apr/2018 
    HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     26.2 C
Minimum Air Temperature                     22.5 C
Grass Minimum Temperature                   21.6 C
Relative Humidity                        77 - 85 Percent
Rainfall                                      trace 
Total rainfall since 1st January           108.9 mm
Against an average of                      277.4 mm

Other Stations                Min                  Max
King's Park                  21.6 C               25.5 C
Wong Chuk Hang               22.2 C               25.3 C
Ta Kwu Ling                  21.4 C               27.7 C
Lau Fau Shan                 20.5 C               29.5 C
Tai Po                       21.8 C               24.6 C
Sha Tin                      21.7 C               25.7 C
Tuen Mun                     21.8 C               25.7 C
Tseung Kwan O                20.8 C               24.2 C
Sai Kung                     21.6 C               24.2 C
Cheung Chau                  21.4 C               26.9 C
Chek Lap Kok                 22.6 C               28.1 C
Tsing Yi                     22.5 C               26.8 C
Shek Kong                    20.9 C               27.8 C
Tsuen Wan Ho Koon            20.1 C               25.8 C
Tsuen Wan Shing Mun Valley   21.7 C               26.0 C
Hong Kong Park               22.1 C               25.0 C
Shau Kei Wan                 21.6 C               23.4 C
Kowloon City                 21.4 C               26.3 C
Happy Valley                 22.2 C               24.9 C
Wong Tai Sin                 21.9 C               26.6 C
Stanley                      22.1 C               24.1 C
Kwun Tong                    21.5 C               25.5 C
Sham Shui Po                 21.9 C               26.1 C
Kai Tak Runway Park          22.4 C               24.3 C
Yuen Long Park               21.2 C               28.1 C
Tai Mei Tuk               21.1 C               27.1 C

Duration of sunshine (King's Park):              0.5 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
Sea surface temperature (Waglan Island):        22.7 C 

Yesterday's (20 Apr 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 microsievert per hour.  These are within the normal
range of fluctuation of the background radiation level in
Hong Kong (see Note). The average dose rates measured at the
radiation monitoring stations over various parts of the
territory were as follows :

Station                     Yesterday's average
                            (microsievert/hour)
Ping Chau                           0.08
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 20 Apr
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Apr 2018> 

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