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Bulletin issued at 23:41 HKT 17/Aug/2018

At 11 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 88 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 12:45 a.m. tomorrow. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 27 degrees.

Between 9:45 and 10:45 p.m., the rainfall recorded in various regions were:

Islands District 0 to 4 mm;
Wan Chai 0 to 1 mm.


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


Climatological Information for 17 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 23:15 HKT 17/Aug/2018

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

Showers affected the coast of Guangdong and the northern part of the South China Sea today. Locally, it was cloudy with occasional showers and thunderstorms. More than 30 millimetres of rainfall were recorded in many places, rainfall even exceeded 50 millimetres over Tseung Kwan O and Cheung Chau. A southwesterly airstream is expected to bring showers to the south China coast tomorrow.

Besides, Tropical Storm Bebinca moved across the northern part of Vietnam and Laos today, and weakened progressively from a severe tropical storm into an area of low pressure. Tropical Storm Rumbia made landfall over Shanghai this morning. At 11 p.m., Tropical Storm Rumbia was centred about 170 kilometres west of Nanjing. It is forecast to move west-northwest at about 22 kilometres per hour across the inland areas of Anhui and Henan, and weaken gradually. Meanwhile, Severe Tropical Storm Soulik was centred about 190 kilometres southwest of Iwo Jima. It is forecast to move north-northwest at about 10 kilometres per hour across western North Pacific.

Weather forecast for Hong Kong (Saturday, 18 Aug 2018)

Mainly cloudy with a few showers and isolated thunderstorms. Sunny intervals in the afternoon. Temperatures will range between 27 and 31 degrees. Moderate south to southwesterly winds.

Outlook : A few showers and sunny intervals in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/08/2018; 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 21:00 HKT 17/Aug/2018

N0 WARNING.

GENERAL SITUATION AT 170900 UTC:
A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= S TO SW 4. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SWELL SW UP TO 2 M. TEMP 27-31 C. =
KWANGTUNG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
TAIWAN STRAIT= SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BASHI= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
PRATAS= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
BALINTANG= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
SCARBOROUGH= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
PARACEL= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
TONKIN= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
DANANG= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 17/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 17 August 2018

    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.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southwest force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 4 to 5, occasionally force 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind south-southwest force 3

    Shantou Wind west force 2
      Visibility 30 Kilometres

    Dongsha Wind southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind southwest force 3

    Macau Wind south-southwest force 1
      Visibility 14 Kilometres in rain

    Xisha Wind south-southwest force 2
      Visibility 13 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 17:30 HKT 17/AUG/2018
    (Next update at 01:30 HKT 18/AUG/2018)
    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 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  200/10-15                            28-26
   B.   2000 FT:  200/10                               23
   C.   5000 FT:  200/15                               19
   D.  10000 FT:  190/10                               12
   E.  18000 FT:  270/10                               MS1
   F.  24000 FT:  090/10                               MS12
   G.  30000 FT:  090/15                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT  BKN 8000 FT.  TEMPO
      FEW CB 600 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHWESTERLY WINDS. MAINLY
     CLOUDY WITH A FEW SHOWERS AND ISOLATED
     THUNDERSTORMS.=

    ===================================================================
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 21:25 HKT on 17 Aug 18

    VHHK SIGMET 3 VALID 170930/171330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2148 E11430 - N2024 E11336 - N2018 E11130 - N2130 E11130 - N2218 E11324 - N2148 E11430 TOP FL450 STNR NC= VHHK SIGMET 5 VALID 170930/171330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2212 E11730 - N2100 E11730 - N1936 E11624 - N2054 E11436 - N2212 E11542 - N2212 E11730 TOP FL400 STNR NC= VHHK SIGMET 6 VALID 171330/171730 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2106 E11730 - N2100 E11730 - N1854 E11548 - N2100 E11430 - N2154 E11618 - N2106 E11730 TOP FL400 STNR 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

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    Bulletin issued at 12:30 HKT 17/Aug/2018


    Tropical Cyclone Warning

    At 170300 UTC, Tropical Storm Bebinca (1816) with central pressure 990 hectopascals was centred within 60 nautical miles of one nine point three degrees north (19.3 N) one zero five point zero degrees east (105.0 E) and is forecast to move west at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 180300 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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 17/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.0 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   26.5 C
Relative Humidity                        84 - 95 Percent
Rainfall                                     3.2 mm 
Total rainfall since 1st January          1146.8 mm
Against an average of                     1707.4 mm

Other Stations                Min                  Max
King's Park                  26.4 C               29.6 C
Wong Chuk Hang               26.3 C               29.5 C
Ta Kwu Ling                  25.5 C               29.8 C
Lau Fau Shan                 25.4 C               29.8 C
Tai Po                       26.0 C               28.6 C
Sha Tin                      26.1 C               30.6 C
Tuen Mun                     26.0 C               30.0 C
Tseung Kwan O                25.6 C               28.5 C
Sai Kung                     26.1 C               29.2 C
Cheung Chau                  25.5 C               29.4 C
Chek Lap Kok                 27.1 C               31.6 C
Tsing Yi                     26.5 C               30.3 C
Tsuen Wan Ho Koon            25.1 C               27.5 C
Tsuen Wan Shing Mun Valley   25.8 C               28.8 C
Hong Kong Park               25.9 C               30.2 C
Shau Kei Wan                 25.6 C               29.4 C
Kowloon City                 25.9 C               29.3 C
Happy Valley                 26.9 C               30.9 C
Wong Tai Sin                 26.1 C               29.2 C
Stanley                      25.9 C               29.3 C
Kwun Tong                    26.3 C               29.4 C
Sham Shui Po                 26.3 C               30.5 C
Kai Tak Runway Park          26.4 C               29.1 C
Yuen Long Park               25.9 C               30.9 C
Tai Mei Tuk               25.4 C               28.3 C

Duration of sunshine (King's Park):              0.8 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 5.
 

Yesterday's (16 Aug 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
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                           0.13
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 16 Aug
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