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Bulletin issued at 11:02 HKT 16/Sep/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 73 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

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 32 degrees;
Lau Fau Shan 31 degrees;
Tai Po 32 degrees;
Sha Tin 33 degrees;
Tuen Mun 32 degrees;
Tseung Kwan O 33 degrees;
Sai Kung 32 degrees;
Cheung Chau 32 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 31 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 31 degrees;
Tsuen Wan Shing Mun Valley 33 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 33 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 33 degrees;
Stanley 31 degrees;
Kwun Tong 33 degrees;
Sham Shui Po 32 degrees;
Kai Tak Runway Park 33 degrees;
Yuen Long Park 34 degrees;
Tai Mei Tuk 34 degrees.


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


Climatological Information for 16 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 10:45 HKT 16/Sep/2017

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

The anticyclone aloft is bringing generally fine weather to southeastern China.

Tropical Storm Doksuri has weakened into a tropical depression. At 10 a.m., Doksuri was centred about 170 kilometres west-northwest of Vientiane. It is forecast to move west-northwest at about 25 kilometres per hour across Indochina Peninsula and continue to weaken. Meanwhile, Typhoon Talim was centred about 490 kilometres southwest of Kagoshima. It is forecast to move northeast at about 12 kilometres per hour across the East China Sea towards Japan.

Weather forecast for today

Mainly fine and very hot but hazy. There will be isolated showers. Light winds.

Outlook : Fine and very hot tomorrow. Sunny periods early next week.


(The above forecast period is valid up to 23:59 HKT today, 16/09/2017; 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 16/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 152100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 160100 UTC:

HONG KONG= W TO SW 4. ISOL SHOWERS. DOWN TO 4000 M IN SOME HAZE. SWELL SE 2-3 M. TEMP 33-28 C. =
KWANGTUNG= W TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 3 M. =
TAIWAN STRAIT= W TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 3-5 M. =
BASHI= W 5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 3-5 M. =
PRATAS= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SE 3 M. =
BALINTANG= W 5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 3 M. =
SCARBOROUGH= SW 5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 3 M. =
PARACEL= S TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 3 M. =
TONKIN= S TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 3 M. =
DANANG= S TO SE 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 3-5 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

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    Bulletin issued at 09:30 HKT 16/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 16 September 2017

    Warnings:
    Strong winds in Shangchuan Dao.

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

    At 9 a.m., Typhoon Talim with maximum sustained winds of about 140 kilometres per hour near its centre was located at 29.1 degrees north, 126.3 degrees east It is forecast to move northeast at about 12 kilometres per hour across the East China Sea towards Japan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to southwest force 4.
    Isolated showers. Some haze.
    Moderate seas.

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

    Shangchuan Dao:
    Southeast force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

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

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

    Waglan Island Wind north force 3
      Visibility 15 Kilometres

    Shantou Wind west force 2
      Visibility 16 Kilometres

    Dongsha Wind west force 2
      Visibility 10 Kilometres

    Macau Wind northwest force 1
      Visibility 9 Kilometres

    Xisha Wind east-southeast force 2
      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 09:00 HKT 16/SEP/2017
    (Next update at 17:30 HKT 16/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE ANTICYCLONE ALOFT IS BRINGING GENERALLY FINE
     WEATHER TO SOUTHEASTERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10                             29-34
   B.   2000 FT:  330/10                               26
   C.   5000 FT:  300/15                               20
   D.  10000 FT:  300/15                               12
   E.  18000 FT:  320/15                               MS3
   F.  24000 FT:  340/15                               MS14
   G.  30000 FT:  350/25                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE APART FROM ISOLATED SHOWERS.
      LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/HAZE.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11200 FT
   M. TURBULENCE    : NIL.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT WINDS.  FINE.  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.

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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 07:30 HKT on 15 Sep 17

    VHHK SIGMET 5 VALID 141930/142330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1648 E11406 - N1642 E11400 - N1930 E11130 - N2124 E11130 - N2148 E11218 - N1900 E11342 - N1648 E11406 TOP FL420 MOV W 10KT NC= VHHK SIGMET 6 VALID 142330/150330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1800 E11248 - N1930 E11130 - N2124 E11130 - N2154 E11236 - N1918 E11306 - N1800 E11248 TOP FL420 MOV W 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

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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 15/Sep/2017


    Tropical Cyclone Warning

    Typhoon Doksuri (1719) has weakened into a Severe Tropical Storm with central pressure 975 hectopascals. At 151200 UTC, it was centred within 90 nautical miles of one eight point zero degrees north (18.0 N) one zero four point five degrees east (104.5 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 60 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    No further warnings on this Severe Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 161200 UTC
    Dissipated over land.

    Bulletin issued at 18:31 HKT 15/Sep/2017


    Tropical Cyclone Warning

    At 150900 UTC, Severe Typhoon Talim (1718) with central pressure 950 hectopascals was centred within 60 nautical miles of two eight point six degrees north (28.6 N) one two five point three degrees east (125.3 E) and is forecast to move northeast at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 85 knots.

    Radius of over 33 knot winds 180 nautical miles.
    Radius of over 47 knot winds 120 nautical miles.
    Radius of over 63 knot winds 60 nautical miles.
    Radius of over 2 metre waves 270 nautical miles.

    No further warnings on this Severe Typhoon will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 160900 UTC
    Two nine point eight degrees north (29.8 N)
    One two seven point one degrees east (127.1 E)
    Maximum winds 75 knots.

    Forecast position and intensity at 170900 UTC
    Three three point nine degrees north (33.9 N)
    One three two point nine degrees east (132.9 E)
    Maximum winds 60 knots.

    Forecast position and intensity at 180900 UTC
    Become extratropical low.



    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 16/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.2 C
Minimum Air Temperature                     27.8 C
Grass Minimum Temperature                   26.6 C
Relative Humidity                        66 - 85 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2348.7 mm
Against an average of                     2095.8 mm

Other Stations                Min                  Max
King's Park                  27.2 C               33.2 C
Wong Chuk Hang               27.1 C               31.7 C
Ta Kwu Ling                  24.9 C               32.7 C
Lau Fau Shan                 25.5 C               32.7 C
Tai Po                       26.5 C               31.3 C
Sha Tin                      26.8 C               32.5 C
Tuen Mun                     26.5 C               33.1 C
Tseung Kwan O                25.8 C               33.6 C
Sai Kung                     27.2 C               32.3 C
Cheung Chau                  26.5 C               32.8 C
Chek Lap Kok                 28.0 C               33.4 C
Tsing Yi                     27.2 C               32.5 C
Shek Kong                    26.2 C               32.9 C
Tsuen Wan Ho Koon            25.4 C               31.6 C
Tsuen Wan Shing Mun Valley   26.2 C               32.8 C
Hong Kong Park               27.4 C               32.1 C
Shau Kei Wan                 27.0 C               31.2 C
Kowloon City                 27.0 C               33.0 C
Happy Valley                 27.6 C               33.8 C
Wong Tai Sin                 26.6 C               32.4 C
Stanley                      27.5 C               31.9 C
Kwun Tong                    26.8 C               32.9 C
Sham Shui Po                 27.1 C               33.2 C
Kai Tak Runway Park          28.0 C               31.3 C
Yuen Long Park               26.5 C               33.2 C
Tai Mei Tuk               26.6 C               32.9 C

Duration of sunshine (King's Park):              4.9 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
Sea surface temperature (Waglan Island):        29.6 C 

Yesterday's (15 Sep 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                          0.09
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 1987-2016, 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 15 Sep
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