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Bulletin issued at 04:16 HKT 21/Aug/2016

At 4 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 94 per cent.

Though rainstorm warning has been cancelled, people should stay alert to the danger that may be brought about by river flooding.

Gusts reaching 70 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 5:00 a.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 24 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 23 degrees;
Lau Fau Shan 23 degrees;
Tai Po 24 degrees;
Sha Tin 24 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 24 degrees;
Sai Kung 24 degrees;
Cheung Chau 23 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 24 degrees;
Shek Kong // degrees;
Tsuen Wan Ho Koon 23 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan // degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 24 degrees;
Kwun Tong 24 degrees;
Sham Shui Po 24 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 24 degrees.

Between 2:45 and 3:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Southern District 10 to 39 mm;
Yuen Long 7 to 36 mm;
Tuen Mun 16 to 30 mm;
Islands District 6 to 28 mm;
Sai Kung 1 to 25 mm;
Central & Western District 12 to 22 mm;
Kwun Tong 7 to 21 mm;
Wan Chai 16 to 20 mm;
Tsuen Wan 8 to 19 mm;
Eastern District 11 to 17 mm;
Kwai Tsing 11 to 15 mm;
Kowloon City 5 to 14 mm;
Yau Tsim Mong 9 to 13 mm;
Sham Shui Po 8 to 12 mm;
North District 1 to 11 mm;
Sha Tin 2 to 10 mm;
Tai Po 2 to 8 mm;
Wong Tai Sin 3 to 5 mm.


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


Climatological Information for 21 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Local Weather Forecast

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

Current Weather | Regional Temperature Forecast in HK |  9-day Weather Forecast
UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 04:10 HKT 21/Aug/2016

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

Showers and thunderstorms are affecting the coast of Guangdong and the northern part of the South China Sea. Locally, thundery showers after midnight generally brought more than 30 millimetres of rainfall to the territory, and rainfall even exceeded 50 millimetres over Northern District and Sai Kung. Meanwhile, more than 5000 times of cloud to ground lightning were recorded over the territory.

At 2 a.m., Tropical Storm Lionrock was centred about 530 kilometres east-southeast of Kagoshima. It is forecast to move southwest or west-southwest at about 16 kilometres per hour, across the seas south of Japan.

Weather forecast for today

A few showers. Isolated squally thunderstorms at first. The minimum temperature will be about 25 degrees. Hot with sunny periods during the day. The maximum temperature will be around 32 degrees in the urban areas, and a couple of degrees higher in the New Territories. Light winds.

Outlook : Mainly fine and very hot in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 21/08/2016; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 20/Aug/2016

N0 WARNING.

GENERAL SITUATION AT 200900 UTC:
A SOUTHERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= S TO SW 3-4. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. TEMP 28-32 C. =
KWANGTUNG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
TAIWAN STRAIT= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
BASHI= W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
PRATAS= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2 M. =
BALINTANG= W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
SCARBOROUGH= W TO NW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
PARACEL= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M. SWELL SW 2 M. =
TONKIN= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2 M. =
DANANG= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 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 03:30 HKT 21/Aug/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 21 August 2016

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 3 to 4.
    Isolated heavy squally showers and thunderstorms.
    Slight to moderate seas.

    Nan'ao:
    South to southwest force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    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, becoming easterly winds of force 4 to 5. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 4
      Visibility 1300 Metres

    Shantou Wind west-northwest force 1
      Visibility 11 Kilometres

    Dongsha Wind south force 1
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Macau Wind southwest force 2
      Visibility 8 Kilometres

    Xisha Wind south-southwest force 2
      Visibility 27 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
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  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 21/AUG/2016
    (Next update at 9:00-9:30 HKT 21/AUG/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ARE AFFECTING THE COAST OF GUANGDONG AND
     THE NORTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  300/5-10
                  TEMPO VRB/15G25 IN TS                28-32
   B.   2000 FT:  330/10                               24
   C.   5000 FT:  020/10                               20
   D.  10000 FT:  020/10                               11
   E.  18000 FT:  040/15                               MS4
   F.  24000 FT:  060/15                               MS11
   G.  30000 FT:  120/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SHOWERS WITH A FEW ISOLATED THUNDERSTORMS. HOT
      WITH SUNNY PERIODS DURING THE DAY. LOCALIZED
      MIST IN THE MORNING.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.  TEMPO FEW CB 1500 FT  SCT 2500 FT
      BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 4000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 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    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  SUNNY PERIODS 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.

    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 02:52 HKT on 21 Aug 16

    VHHK SIGMET 1 VALID 201900/202300 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N2100 AND W OF E11600 TOP FL450 MOV S 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.

    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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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 19/Aug/2016


    Tropical Cyclone Warning

    At 191200 UTC, Tropical Storm Dianmu (1608) with central pressure 988 hectopascals was centred within 60 nautical miles of two zero point eight degrees north (20.8 N) one zero five point four degrees east (105.4 E) and is forecast to weaken and move west at about 14 knots for the next 24 hours.

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

    Radius of over 33 knot winds 60 nautical miles over eastern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 150 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 201200 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 21/Aug/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        69 - 97 Percent
Rainfall                                     3.8 mm 
Total rainfall since 1st January          1889.1 mm
Against an average of                     1761.7 mm

Other Stations                Min                  Max
King's Park                  26.7 C               32.4 C
Wong Chuk Hang               27.0 C               31.2 C
Ta Kwu Ling                  26.1 C               34.0 C
Lau Fau Shan                 26.9 C               33.4 C
Tai Po                       26.5 C               32.1 C
Sha Tin                      26.0 C               33.5 C
Tuen Mun                     26.9 C               34.3 C
Tseung Kwan O                26.5 C               31.8 C
Sai Kung                     27.0 C               32.0 C
Cheung Chau                  26.8 C               32.0 C
Chek Lap Kok                 27.3 C               34.2 C
Tsing Yi                     26.7 C               32.3 C
Shek Kong                    26.3 C               34.8 C
Tsuen Wan Ho Koon            26.2 C               30.7 C
Tsuen Wan Shing Mun Valley   26.5 C               32.7 C
Hong Kong Park               26.9 C               32.1 C
Kowloon City                 27.1 C               32.7 C
Happy Valley                 27.0 C               33.4 C
Wong Tai Sin                 26.4 C               32.7 C
Stanley                      26.9 C               31.6 C
Kwun Tong                    27.5 C               32.9 C
Sham Shui Po                 27.2 C               32.9 C
Kai Tak Runway Park          26.9 C               31.3 C
Yuen Long Park               27.2 C               35.3 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 10.
Sea surface temperature (Waglan Island):        27.3 C 

Yesterday's (20 Aug 2016) 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                               0.09
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.13
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 during
the period 1987-2015, 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 20 Aug
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