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Bulletin issued at 11:35 HKT 09/Sep/2016

At 11 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 84 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Widespread heavy rain may affect Hong Kong in a couple of hours. Members of the public should be on the alert.


Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 1:00 p.m. today. Squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan // degrees;
Tai Po 28 degrees;
Sha Tin 30 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 28 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 29 degrees;
Stanley 27 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 26 degrees.

Between 9:45 and 10:45 a.m., lightning was detected within Lantau and New Territories West. The rainfall recorded in various regions were:

Islands District 0 to 37 mm;
Yuen Long 0 to 34 mm;
Tuen Mun 3 to 27 mm;
Kwai Tsing 0 to 20 mm;
Tsuen Wan 0 to 5 mm;
Eastern District 0 to 2 mm;
Sham Shui Po 0 to 2 mm.


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


Climatological Information for 9 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 11:15 HKT 09/Sep/2016

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

A trough of low pressure is bringing showers to the south China coast and the northern part of the South China Sea.

Weather forecast for today

Mainly cloudy with occasional showers and squally thunderstorms. Showers will be heavy at time at first. Light to moderate southwesterly winds.

Outlook : Mainly cloudy with a few showers in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 09/09/2016; 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 09:00 HKT 09/Sep/2016

N0 WARNING.

GENERAL SITUATION AT 082100 UTC:
TROUGH 20N 106E 24N 118E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 090100 UTC:

HONG KONG= S TO SW 3-4. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. TEMP 30-26 C. =
KWANGTUNG= S TO SW 4. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. =
TAIWAN STRAIT= SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= S TO SW 4. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. =
BALINTANG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PARACEL= S TO SW 4, OCNL 5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= S TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= S TO SW 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 11:30 HKT 09/Sep/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 a.m. on 09 September 2016

    Weather Situation:
    A trough of low pressure is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 3 to 4.
    Occasional showers and squally thunderstorms. Showers will be heavy at times at first.
    Slight to moderate seas.

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

    Outlook for the next 48 hours
    South to southwesterly winds of force 4, becoming easterly winds of force 4 later. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 5
      Visibility 30 Kilometres

    Shantou Wind north-northwest force 1
      Visibility 9 Kilometres

    Dongsha Wind southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind west force 4

    Macau Wind south force 1
      Visibility 11 Kilometres

    Xisha Wind southwest force 3
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 09/SEP/2016
    (Next update at 17:30 HKT 09/SEP/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A TROUGH OF LOW PRESSURE IS BRINGING SHOWERS TO
     THE SOUTH CHINA COAST AND THE NORTHERN PART OF
     THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  230/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  230/10-15                            27-32
   B.   2000 FT:  240/10                               24
   C.   5000 FT:  250/15                               19
   D.  10000 FT:  270/10                               12
   E.  18000 FT:  090/10                               MS1
   F.  24000 FT:  060/10                               MS12
   G.  30000 FT:  050/10                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND ISOLATED
      THUNDERSTORMS. SUNNY INTERVALS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3500 FT.  
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 5000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. 
                      MOD OFFSHORE.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE 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.

    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 09:15 HKT on 09 Sep 16

    VHHK SIGMET 1 VALID 090120/090520 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2036 E11712 - N1842 E11212 TOP FL420 MOV NE 05KT 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
    Current Weather |  Local Weather Forecast |  9-day Weather Forecast
    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 09/Sep/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.4 C
Minimum Air Temperature                     25.5 C
Grass Minimum Temperature                   25.3 C
Relative Humidity                        82 - 97 Percent
Rainfall                                     2.8 mm 
Total rainfall since 1st January          2132.7 mm
Against an average of                     1996.6 mm

Other Stations                Min                  Max
King's Park                  25.3 C               28.3 C
Wong Chuk Hang               25.2 C               27.7 C
Ta Kwu Ling                  24.8 C               30.2 C
Tai Po                       25.5 C               29.0 C
Sha Tin                      25.3 C               29.8 C
Tuen Mun                     25.7 C               29.0 C
Tseung Kwan O                25.1 C               28.1 C
Sai Kung                     25.6 C               28.4 C
Cheung Chau                  24.9 C               27.6 C
Chek Lap Kok                 26.6 C               31.3 C
Tsing Yi                     25.3 C               28.7 C
Shek Kong                    25.0 C               30.0 C
Tsuen Wan Ho Koon            24.5 C               27.6 C
Tsuen Wan Shing Mun Valley   25.0 C               28.2 C
Hong Kong Park               25.2 C               28.1 C
Shau Kei Wan                 25.0 C               29.2 C
Kowloon City                 25.3 C               28.4 C
Happy Valley                 25.7 C               29.3 C
Wong Tai Sin                 25.3 C               28.4 C
Stanley                      24.5 C               27.5 C
Kwun Tong                    25.8 C               28.7 C
Sham Shui Po                 25.6 C               28.9 C
Kai Tak Runway Park          26.1 C               28.9 C
Yuen Long Park               25.3 C               29.4 C

Duration of sunshine (King's Park):              0.2 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 (08 Sep 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 08 Sep
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