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Bulletin issued at 18:02 HKT 25/Aug/2018

At 6 p.m. at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 51 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.4. 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 32 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 32 degrees;
Tai Po 33 degrees;
Sha Tin 33 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 32 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 33 degrees;
Tsing Yi 31 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 31 degrees;
Hong Kong Park 33 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 30 degrees;
Kwun Tong 33 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 33 degrees;
Yuen Long Park 33 degrees;
Tai Mei Tuk 32 degrees.


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


Climatological Information for 25 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 17:45 HKT 25/Aug/2018

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

Winds are light and it is very hot over the coast of Guangdong. Locally, temperatures generally rose to 33 degrees or above in the afternoon.

Weather forecast for tonight and tomorrow

Mainly cloudy with some haze. Sunny periods tomorrow. A few showers later. Temperatures will range between 27 and 32 degrees tomorrow. Light to moderate westerly winds.

Outlook : Becoming more showery with thunderstorms in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 26/08/2018; 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 09:00 HKT 25/Aug/2018

GALE WARNING AREAS: BASHI, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 242100 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION NEAR TAIWAN, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 250100 UTC:

HONG KONG= W 3-4. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. DOWN TO 4000 M IN SOME HAZE. TEMP 32-27 C. =
KWANGTUNG= W TO SW 4-5, 6 IN E. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 2 M, 3 M IN E. SWELL SW 2 M. =
TAIWAN STRAIT= S TO SW 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2 M. =
BASHI= SW 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
PRATAS= SW 5-6, OCNL 7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2 M. =
BALINTANG= SW 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2 M. =
PARACEL= W TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2 M. =
TONKIN= W TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
DANANG= W TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 25/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 25 August 2018

    Weather Situation:
    Showers and thunderstorms are affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West force 3 to 4.
    Isolated squally showers and thunderstorms. Some hazy.
    Slight to moderate seas.

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

    Shangchuan Dao:
    West force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    West to southwesterly winds of force 4 to 5, up to force 6 in east. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 3
      Visibility 12 Kilometres

    Shantou Wind southwest force 2
      Visibility 30 Kilometres

    Dongsha Wind west force 3
      Visibility 9 Kilometres

    Huangmaozhou Wind west force 4

    Macau Wind east force 2
      Visibility 8 Kilometres

    Xisha Wind west-southwest force 3
      Visibility 12 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 25/AUG/2018
    (Next update at 01:30 HKT 26/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS AND THUNDERSTORMS ARE 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:  270/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  250/10-15                            33-27
   B.   2000 FT:  300/10-15                            26
   C.   5000 FT:  300/10                               20
   D.  10000 FT:  290/10                               11
   E.  18000 FT:  030/15                               MS2
   F.  24000 FT:  030/15                               MS12
   G.  30000 FT:  040/15                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS. ISOLATED
      THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 4000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE WESTERLIES. SUNNY INTERVALS
     WITH A FEW SHOWERS. LOCALIZED HAZE/MIST.=

    ===================================================================
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 18:22 HKT on 25 Aug 18

    VHHK SIGMET 3 VALID 250630/251030 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1748 E11454 - N1730 E11312 - N1918 E11142 - N1930 E11430 - N2112 E11400 - N2100 E11730 TOP FL480 STNR NC= VHHK SIGMET 4 VALID 251030/251430 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2024 E11700 - N1642 E11400 - N1812 E11242 - N2036 E11430 - N2024 E11700 TOP FL490 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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 12:30 HKT 25/Aug/2018


    Tropical Cyclone Warning

    At 250300 UTC, the tropical depression over Fujian with central pressure 996 hectopascals was centred within 60 nautical miles of two five point four degrees north (25.4 N) one one nine point three degrees east (119.3 E) and is forecast to move west at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

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

    Forecast position and intensity at 260300 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 25/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.9 C
Minimum Air Temperature                     25.6 C
Grass Minimum Temperature                   26.0 C
Relative Humidity                        70 - 90 Percent
Rainfall                                     0.1 mm 
Total rainfall since 1st January          1374.1 mm
Against an average of                     1836.6 mm

Other Stations                Min                  Max
King's Park                  25.2 C               32.4 C
Wong Chuk Hang               24.6 C               32.4 C
Ta Kwu Ling                  24.0 C               33.1 C
Lau Fau Shan                 24.2 C               32.6 C
Tai Po                       24.9 C               33.1 C
Sha Tin                      25.4 C               34.1 C
Tuen Mun                     25.0 C               32.4 C
Tseung Kwan O                24.4 C               32.5 C
Sai Kung                     25.1 C               32.9 C
Cheung Chau                  24.7 C               30.7 C
Chek Lap Kok                 27.0 C               33.8 C
Tsing Yi                     24.8 C               32.6 C
Shek Kong                    24.7 C               33.9 C
Tsuen Wan Ho Koon            23.9 C               31.7 C
Tsuen Wan Shing Mun Valley   24.6 C               33.0 C
Hong Kong Park               24.3 C               32.3 C
Shau Kei Wan                 24.8 C               33.0 C
Kowloon City                 25.4 C               33.8 C
Happy Valley                 25.1 C               34.4 C
Wong Tai Sin                 24.7 C               33.8 C
Stanley                      24.8 C               31.4 C
Kwun Tong                    25.5 C               33.0 C
Sham Shui Po                 25.3 C               33.6 C
Kai Tak Runway Park          25.6 C               32.4 C
Yuen Long Park               24.5 C               33.3 C
Tai Mei Tuk               24.5 C               33.5 C

Duration of sunshine (King's Park):              4.9 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 6.
 

Yesterday's (24 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 24 Aug
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