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Bulletin issued at 09:02 HKT 08/Sep/2017

At 9 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 85 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Hot weather might cause adverse health effects. The Observatory advises the public to stay on the alert.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 30 degrees;
Cheung Chau 30 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 28 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 31 degrees;
Kowloon City 30 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 30 degrees.

Between midnight and 9 a.m. the minimum temperature was 26.9 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 8 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 08:45 HKT 08/Sep/2017

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

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

Weather forecast for today

Hot with sunny periods and a few showers. The maximum temperature will be around 32 degrees. Light to moderate southwesterly winds.

Outlook : Still a few showers tomorrow. Mainly fine early next week.


(The above forecast period is valid up to 23:59 HKT today, 08/09/2017; 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 08/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 072100 UTC:
TROUGH 19N 106E 20N 108E 22N 114E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 080100 UTC:

HONG KONG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 32-28 C. =
KWANGTUNG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW 2-3 M. =
BASHI= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2-3 M. =
PRATAS= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2 M. =
BALINTANG= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S 2 M. =
SCARBOROUGH= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PARACEL= 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. =
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 2000 M IN SCT 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 08/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 08 September 2017

    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:
    Southwest force 4 to 5.
    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. Isolated squally showers and thunderstorms.

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

    Shantou Wind west force 2
      Visibility 22 Kilometres

    Dongsha Wind south force 2
      Visibility 10 Kilometres

    Macau Wind southwest force 1
      Visibility 35 Kilometres

    Xisha Wind south-southwest force 2
      Visibility 23 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 08/SEP/2017
    (Next update at 17:30 HKT 08/SEP/2017)
    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 NORTHERN PART OF THE SOUTH CHINA SEA AND THE
     COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  160/10                               28-33
   B.   2000 FT:  160/10                               24
   C.   5000 FT:  160/10                               20
   D.  10000 FT:  180/10                               12
   E.  18000 FT:  200/15                               0
   F.  24000 FT:  220/15                               MS12
   G.  30000 FT:  190/10                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS.  ISOLATED SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     MAINLY CLOUDY WITH A FEW SHOWERS.=

    ===================================================================
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 21:20 HKT on 07 Sep 17

    VHHK SIGMET 3 VALID 070920/071320 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11348 - N1830 E11230 - N1930 E11130 - N2024 E11130 - N2042 E11254 - N2000 E11348 TOP FL360 MOV E 05KT WKN= VHHK SIGMET 4 VALID 071320/071720 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1900 E11200 - N1930 E11130 - N2012 E11130 - N2012 E11230 - N1930 E11242 - N1900 E11200 TOP FL360 MOV E 05KT WKN=

    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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    Severe Weather Information Centre

    Bulletin issued at 18:30 HKT 07/Sep/2017


    Tropical Cyclone Warning

    At 070900 UTC, Tropical Depression Guchol (1717) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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 08/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.7 C
Minimum Air Temperature                     27.5 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        74 - 91 Percent
Rainfall                                     1.8 mm 
Total rainfall since 1st January          2321.2 mm
Against an average of                     1986.9 mm

Other Stations                Min                  Max
King's Park                  26.7 C               30.7 C
Wong Chuk Hang               25.7 C               30.8 C
Ta Kwu Ling                  25.4 C               30.8 C
Tai Po                       25.2 C               30.1 C
Sha Tin                      25.5 C               31.6 C
Tuen Mun                     25.8 C               31.4 C
Tseung Kwan O                25.4 C               31.3 C
Sai Kung                     26.3 C               32.2 C
Cheung Chau                  24.5 C               31.2 C
Chek Lap Kok                 27.5 C               32.3 C
Tsing Yi                     26.3 C               30.3 C
Shek Kong                    25.8 C               30.7 C
Tsuen Wan Ho Koon            25.1 C               28.4 C
Tsuen Wan Shing Mun Valley   25.4 C               29.4 C
Hong Kong Park               26.1 C               31.4 C
Shau Kei Wan                 26.0 C               30.7 C
Kowloon City                 26.7 C               31.1 C
Happy Valley                 26.4 C               32.1 C
Wong Tai Sin                 26.3 C               32.0 C
Stanley                      25.5 C               30.7 C
Kwun Tong                    26.8 C               31.5 C
Sham Shui Po                 27.0 C               31.4 C
Kai Tak Runway Park          26.8 C               30.8 C
Yuen Long Park               27.1 C               31.7 C
Tai Mei Tuk               26.0 C               31.9 C

Duration of sunshine (King's Park):              1.1 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.
Sea surface temperature (Waglan Island):        28.4 C 

Yesterday's (07 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                         0.11
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                      0.12
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 07 Sep
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