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Bulletin issued at 03:02 HKT 06/Sep/2017

At 3 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 91 per cent.

The air temperatures at other places were:

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

Between 1:45 and 2:45 a.m., the rainfall recorded in various regions were:

Tsuen Wan 0 to 3 mm;
Islands District 0 to 1 mm.


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


Climatological Information for 6 Sep

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Bulletin updated at 02:45 HKT 06/Sep/2017

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

Showers are affecting the coast of Guangdong. Meanwhile, the area of low pressure over the Luzon Strait is bringing unsettled weather to the region.

Weather forecast for today

Mainly cloudy with a few showers. The minimum temperature will be about 27 degrees. Sunny periods during the day with a maximum temperature of around 32 degrees. Moderate south to southwesterly winds.

Outlook : Sunny intervals and a few showers in the following couple of days. Becoming fine early next week.


(The above forecast period is valid up to 23:59 HKT today, 06/09/2017; 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 21:00 HKT 05/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 050900 UTC:
LOW 1002 HPA 20N 123E WNW 10 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 051300 UTC:

HONG KONG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 27-32 C. =
KWANGTUNG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= NE 5-6, SW 5-6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
PRATAS= W TO SW 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL E UP TO 2 M. =
BALINTANG= NW 5-6, BEC SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
SCARBOROUGH= W TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 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. =
TONKIN= S 4-5. DOWN TO 4000 M IN ISOL 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 03:30 HKT 06/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 06 September 2017

    Weather Situation:
    A southwesterly airstream is affecting the south China coastal waters. Besides, an area of low pressure is bringing unsettled weather to the seas near Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 4 to 5.
    Isolated squally showers and thunderstorms.
    Moderate seas.

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

    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
    --------------------------------------------------------

    Waglan Island Wind south-southeast force 2
      Visibility 12 Kilometres

    Shantou Wind west-southwest force 1
      Visibility 13 Kilometres

    Dongsha Wind west-northwest force 2
      Visibility 10 Kilometres

    Macau Wind south-southwest force 1
      Visibility 8 Kilometres

    Xisha Wind south-southwest force 4
      Visibility 18 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 05/SEP/2017
    (Next update at 9:00-9:30 HKT 06/SEP/2017)
    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 GUANGDONG AND THE NORTHERN
     PART OF THE SOUTH CHINA SEA. THE AREA OF LOW
     PRESSURE NOW AFFECTING THE LUZON STRAIT WILL
     ENTER THE NORTHEASTERN PART OF THE SOUTH CHINA
     SEA AND MAY INTENSIFY SLIGHTLY TODAY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5-10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  180/10, OCNL 15                      27-32
   B.   2000 FT:  220/10                               23
   C.   5000 FT:  220/10                               20
   D.  10000 FT:  050/10                               11
   E.  18000 FT:  100/10                               0
   F.  24000 FT:  100/20                               MS12
   G.  30000 FT:  100/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 4500 FT.
      TEMPO FEW CB 1500 FT  SCT 2500 FT  BKN 6000 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) : 11000 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 TO MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     SUNNY PERIODS WITH ISOLATED SHOWERS AND
     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 02:10 HKT on 06 Sep 17

    VHHK SIGMET 1 VALID 051426/051820 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11712 - N1906 E11554 - N2012 E11412 - N2100 E11506 - N2042 E11712 TOP FL450 MOV WSW 10KT NC= VHHK SIGMET 2 VALID 051820/052220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2012 E11654 - N1924 E11612 - N2000 E11436 - N2106 E11512 - N2012 E11654 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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    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 06/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.7 C
Minimum Air Temperature                     25.9 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        77 - 98 Percent
Rainfall                                     6.4 mm 
Total rainfall since 1st January          2319.4 mm
Against an average of                     1958.7 mm

Other Stations                Min                  Max
King's Park                  25.6 C               31.1 C
Wong Chuk Hang               25.7 C               30.7 C
Ta Kwu Ling                  25.7 C               31.7 C
Sha Tin                      26.0 C               31.6 C
Tuen Mun                     26.4 C               30.4 C
Tseung Kwan O                25.0 C               30.9 C
Sai Kung                     25.9 C               29.8 C
Cheung Chau                  25.5 C               32.4 C
Chek Lap Kok                 27.6 C               32.4 C
Tsing Yi                     25.4 C               31.5 C
Shek Kong                    26.3 C               32.0 C
Tsuen Wan Shing Mun Valley   25.1 C               30.5 C
Hong Kong Park               25.7 C               30.1 C
Shau Kei Wan                 24.4 C               30.5 C
Kowloon City                 25.4 C               30.8 C
Happy Valley                 26.1 C               30.8 C
Wong Tai Sin                 25.1 C               31.6 C
Stanley                      24.8 C               31.9 C
Kwun Tong                    25.3 C               31.9 C
Sham Shui Po                 25.9 C               32.2 C
Kai Tak Runway Park          25.5 C               32.1 C
Yuen Long Park               27.0 C               31.7 C
Tai Mei Tuk               25.6 C               31.2 C

Duration of sunshine (King's Park):              2.6 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.
Sea surface temperature (Waglan Island):        27.8 C 

Yesterday's (05 Sep 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
Tap Mun                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
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 05 Sep
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