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Bulletin issued at 17:02 HKT 18/Aug/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 33 degrees Celsius and the relative humidity 75 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

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 31 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 33 degrees;
Lau Fau Shan 32 degrees;
Tai Po 30 degrees;
Sha Tin 33 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 31 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 31 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 32 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 32 degrees;
Stanley 31 degrees;
Kwun Tong 32 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 31 degrees.


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


Climatological Information for 18 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 16:45 HKT 18/Aug/2017

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

The subtropical ridge is bringing generally fine and very hot weather to southeastern China. Locally, temperatures in many places rose to about 34 degrees in the afternoon.

Weather forecast for tonight and tomorrow

Fine and very hot apart from isolated showers tomorrow afternoon. Temperatures will range between 28 and 34 degrees. Light winds.

Outlook : Remaining fine and very hot in the following couple of days. Weather deteriorating midweek next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 19/08/2017; 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 18/Aug/2017

N0 WARNING.

GENERAL SITUATION AT 172100 UTC:
A SOUTHEASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 180100 UTC:

HONG KONG= S 4. ISOL SHOWERS LATER. TEMP 33-28 C. =
KWANGTUNG= SE 4, OCNL 5. ISOL SHOWERS. SEA UP TO 2 M. =
TAIWAN STRAIT= S 4, OCNL 5. ISOL SHOWERS. SEA UP TO 2 M. =
BASHI= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
PRATAS= SE 4, OCNL 5. ISOL SHOWERS. SEA UP TO 2 M. =
BALINTANG= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
SCARBOROUGH= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 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 16:30 HKT 18/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 18 August 2017

    Weather Situation:
    A southeasterly airstream is affecting the coastal waters of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Southeast force 4, occasionally force 5.
    Moderate seas.

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

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

    Waglan Island Wind southeast force 2
      Visibility 26 Kilometres

    Shantou Wind south force 2
      Visibility 26 Kilometres

    Dongsha Wind northeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 3

    Macau Wind east force 2
      Visibility 30 Kilometres

    Xisha Wind east force 3
      Visibility 30 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 09:00 HKT 18/AUG/2017
    (Next update at 17:30 HKT 18/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 SOUTHERLY AIRSTREAM IS AFFECTING THE COASTAL
     AREAS OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5-10
                  TEMPO VRB/15G25 IN TS                29-34
   B.   2000 FT:  160/10                               24
   C.   5000 FT:  140/10                               20
   D.  10000 FT:  140/10                               12
   E.  18000 FT:  140/10                               MS5
   F.  24000 FT:  180/10                               MS15
   G.  30000 FT:  230/15                               MS29
   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 2500 FT. TEMPO 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: 16500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTHEASTERLY WINDS. MAINLY
     FINE.=

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

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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 13:00 HKT on 16 Aug 17

    VHHK SIGMET 1 VALID 160205/160500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2148 E11212 - N2218 E11324 - N2200 E11506 - N1930 E11536 - N1906 E11248 - N2148 E11212 TOP FL400 MOV N 10KT NC= VHHK SIGMET 2 VALID 160500/160900 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2154 E11224 - N2230 E11342 - N2324 E11636 - N1842 E11506 - N1900 E11300 - N2154 E11224 TOP FL400 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 18/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.0 C
Minimum Air Temperature                     27.9 C
Grass Minimum Temperature                   26.9 C
Relative Humidity                        61 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1905.3 mm
Against an average of                     1719.2 mm

Other Stations                Min                  Max
King's Park                  27.6 C               32.4 C
Wong Chuk Hang               26.4 C               31.4 C
Ta Kwu Ling                  24.9 C               34.4 C
Lau Fau Shan                 26.9 C               33.1 C
Tai Po                       26.2 C               32.9 C
Sha Tin                      26.6 C               34.2 C
Tuen Mun                     26.4 C               32.7 C
Tseung Kwan O                25.8 C               34.0 C
Sai Kung                     26.9 C               32.6 C
Cheung Chau                  26.2 C               32.2 C
Chek Lap Kok                 27.7 C               33.5 C
Tsing Yi                     26.7 C               32.5 C
Shek Kong                    26.2 C               33.9 C
Tsuen Wan Ho Koon            25.2 C               31.8 C
Tsuen Wan Shing Mun Valley   26.4 C               32.9 C
Hong Kong Park               26.8 C               32.0 C
Shau Kei Wan                 26.3 C               32.6 C
Kowloon City                 27.1 C               34.0 C
Happy Valley                 26.9 C               34.3 C
Wong Tai Sin                 26.6 C               34.2 C
Stanley                      26.5 C               32.1 C
Kwun Tong                    27.7 C               33.9 C
Sham Shui Po                 27.6 C               33.0 C
Kai Tak Runway Park          27.2 C               33.2 C
Yuen Long Park               27.0 C               33.9 C
Tai Mei Tuk               26.7 C               34.8 C

Duration of sunshine (King's Park):              10.3 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
 

Yesterday's (17 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                             0.09
Kat O                               0.08
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.08
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 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 17 Aug
     2003copy right image | Important notices | Privacy policy Last revision date: <18 Aug 2017> 

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