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Bulletin issued at 10:02 HKT 12/Aug/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 76 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 31 degrees;
Lau Fau Shan 30 degrees;
Tai Po 31 degrees;
Sha Tin 32 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 32 degrees;
Sai Kung 32 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 30 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 31 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 32 degrees.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 12 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 09:45 HKT 12/Aug/2017

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

The subtropical ridge covering southeastern China is strengthening gradually.

Weather forecast for today

Mainly fine and very hot apart from one or two isolated showers at first. Moderate south to southwesterly winds.

Outlook : Fine and very hot in the next few days.


(The above forecast period is valid up to 23:59 HKT today, 12/08/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 12/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 112100 UTC:
A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= S TO SW 4-5. ISOL SHOWERS AT FIRST. SEA UP TO 2 M. TEMP 33-29 C. =
KWANGTUNG= S TO SW 4-5. ISOL SHOWERS AND TS IN W. SEA UP TO 2 M. =
TAIWAN STRAIT= SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
BASHI= W TO SW 4-5. FINE. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PRATAS= S TO SW 4-5. FINE. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
BALINTANG= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PARACEL= S 4-5, OCNL 6. ISOL SHOWERS AND TS IN W. SEA UP TO 3 M. SWELL SW UP TO 2 M. =
TONKIN= S 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= S 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
NNNN
Abbreviations:
KT, VRB, SLW, FRQ - knot, variable, slow, frequent STNR, QSTNR, C - stationary, quasi-stationary, degrees celsius WKN, INTSF, INTST, NC - weaken, intensify, intensity, no change LGT, ISOL, SCT, OCNL - light, isolated, scattered, occasional CLD, DZ, TS - cloudy, drizzle, thunderstorm

The date and time are specified by a 6-digit number DDHHMM. DD stands for the day of month, HH represents the hour while MM indicates the minute in UTC.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 12/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 12 August 2017

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 4 to 5.
    Isolated showers at first.
    Moderate seas.

    Nan'ao:
    Southwest force 4 to 5.
    Moderate seas.

    Shanwei and South of Hong Kong:
    South to southwest force 4 to 5.
    Moderate seas.

    Shangchuan Dao:
    South to southwest force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind southwest force 4
      Visibility 15 Kilometres

    Shantou Wind southwest force 2
      Visibility 26 Kilometres

    Dongsha Wind west-southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southwest force 3

    Macau Wind west-southwest force 1
      Visibility 12 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 21 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 12/AUG/2017
    (Next update at 17:30 HKT 12/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  210/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  210/10-15                            29-34
   B.   2000 FT:  190/15-20                            25
   C.   5000 FT:  220/20                               19
   D.  10000 FT:  210/20                               12
   E.  18000 FT:  190/10                               MS3
   F.  24000 FT:  160/10                               MS14
   G.  30000 FT:  090/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE APART FROM ISOLATED SHOWERS. A FEW
      ISOLATED THUNDERSTORMS OVER INLAND LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT TEMPO FEW CB 800 FT SCT 1200 FT
      BKN 5000 FT
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHWESTERLY WINDS.  MAINLY
     FINE APART FROM ISOLATED SHOWERS.=

    ===================================================================
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 12:20 HKT on 04 Aug 17

    VHHK SIGMET 1 VALID 040020/040420 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1930 E11130 - N2124 E11130 - N2230 E11342 - N2300 E11512 - N2012 E11406 - N1930 E11130 TOP FL420 MOV N 10KT NC= VHHK SIGMET 2 VALID 040420/040820 VHHH- VHHK HONG KONG FIR EMBD TS FCSTWI N2006 E11130 - N2124 E11130 - N2230 E11342 - N2254 E11454 - N2130 E11454 - N2006 E11130 TOP FL420 MOV N 10KT NC= VHHK SIGMET 3 VALID 040420/040820 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2006 E11130 - N2124 E11130 - N2230 E11342 - N2254 E11454 - N2130 E11454 - N2006 E11130 TOP FL420 MOV N 10KT 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.

    The latest report on Tropical Cyclone Roke broadcast by Miss LEE SHUK MING , Senior Scientific Officer of the Hong Kong Observatory at 6:23 p.m. on 23 Jul 2017.
    Listen Listen

    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 12/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.6 C
Minimum Air Temperature                     28.9 C
Grass Minimum Temperature                   28.0 C
Relative Humidity                        73 - 85 Percent
Rainfall                                     3.5 mm 
Total rainfall since 1st January          1905.1 mm
Against an average of                     1622.6 mm

Other Stations                Min                  Max
King's Park                  28.8 C               32.4 C
Wong Chuk Hang               27.7 C               31.6 C
Ta Kwu Ling                  26.4 C               33.8 C
Lau Fau Shan                 27.5 C               33.4 C
Sha Tin                      29.0 C               33.0 C
Tuen Mun                     28.2 C               33.2 C
Tseung Kwan O                28.1 C               33.4 C
Sai Kung                     27.9 C               33.1 C
Cheung Chau                  27.1 C               31.8 C
Chek Lap Kok                 29.7 C               33.7 C
Tsing Yi                     28.3 C               32.1 C
Shek Kong                    28.1 C               33.4 C
Tsuen Wan Ho Koon            27.3 C               30.5 C
Tsuen Wan Shing Mun Valley   28.3 C               32.1 C
Hong Kong Park               27.6 C               32.6 C
Shau Kei Wan                 28.8 C               31.7 C
Kowloon City                 28.4 C               32.9 C
Happy Valley                 28.3 C               32.0 C
Wong Tai Sin                 28.0 C               32.1 C
Stanley                      28.0 C               31.8 C
Kwun Tong                    27.6 C               32.0 C
Sham Shui Po                 28.2 C               32.5 C
Kai Tak Runway Park          27.4 C               32.0 C
Yuen Long Park               27.4 C               33.1 C
Tai Mei Tuk               28.0 C               33.0 C

Duration of sunshine (King's Park):              5.0 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        24.6 C 

Yesterday's (11 Aug 2017) 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                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.12
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 11 Aug
     2003copy right image | Important notices | Privacy policy Last revision date: <12 Aug 2017> 

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