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Bulletin issued at 12:02 HKT 18/Sep/2017

At noon at the Hong Kong Observatory the air temperature was 32 degrees Celsius and the relative humidity 68 per cent.
During the past hour the mean UV Index recorded at King's Park was 8. The intensity of UV radiation was very high.

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 32 degrees;
Wong Chuk Hang 32 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 32 degrees;
Tai Po 31 degrees;
Sha Tin 31 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 31 degrees;
Sai Kung 30 degrees;
Cheung Chau 32 degrees;
Chek Lap Kok 33 degrees;
Tsing Yi 31 degrees;
Shek Kong 33 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 32 degrees;
Hong Kong Park 32 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 33 degrees;
Happy Valley 33 degrees;
Wong Tai Sin 31 degrees;
Stanley 30 degrees;
Kwun Tong 31 degrees;
Sham Shui Po 33 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 32 degrees.

No rainfall was recorded at the Hong Kong Observatory between midnight last night and midday today.


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


Climatological Information for 18 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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

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Bulletin updated at 11:45 HKT 18/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.

Weather forecast for this afternoon and tonight

Mainly fine. Hot with some haze in the afternoon. Moderate easterly winds.

Outlook : Mainly fine tomorrow. Sunny periods and one or two showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 18/09/2017; 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 18/Sep/2017

N0 WARNING.

GENERAL SITUATION AT 172100 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 180100 UTC:

HONG KONG= E 4-5. DOWN TO 4000 M IN SOME HAZE AT FIRST, ISOL SHOWERS AND TS. TEMP 32-27 C. =
KWANGTUNG= E 4-5. FINE. SEA UP TO 2 M. =
TAIWAN STRAIT= NE 4-5, OCNL 6. FINE. SEA UP TO 3 M. SWELL NE 2-3 M. =
BASHI= E 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
PRATAS= E 4-5. FINE. SEA UP TO 2 M. =
BALINTANG= E 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL NE 2 M. =
SCARBOROUGH= NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= NW 4-5, BEC E TO SE UP TO 5. ISOL SHOWERS. SEA UP TO 2 M. =
TONKIN= SE 4-5. FINE. SEA UP TO 2 M. =
DANANG= NW 4-5, BEC SE UP TO 5. ISOL SHOWERS. 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
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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 12:30 HKT 18/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 18 September 2017

    Weather Situation:
    An easterly airstream is affecting the coastal waters of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5.
    Some haze.
    Moderate seas.

    Nan'ao and Shanwei:
    East force 4 to 5.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    East force 4 to 5.
    Isolated showers and thunderstorms at first.
    Moderate seas.

    Outlook for the next 48 hours
    Easterly winds of up to force 5.

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

    Waglan Island Wind east force 3
      Visibility 20 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 23 Kilometres

    Dongsha Wind northeast force 2
      Visibility 10 Kilometres

    Macau Wind east force 2
      Visibility 9 Kilometres

    Xisha Wind north-northwest force 2
      Visibility 22 Kilometres

  • Explanation of Seas or Sea Waves
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  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 18/SEP/2017
    (Next update at 17:30 HKT 18/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:  090/10
       OFFSHORE:  090/10-15                            30-35
   B.   2000 FT:  130/10                               25
   C.   5000 FT:  030/10                               19
   D.  10000 FT:  350/15                               12
   E.  18000 FT:  020/20                               MS2
   F.  24000 FT:  060/15                               MS12
   G.  30000 FT:  100/25-30                            MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE.  LOCALIZED HAZE AND A FEW SHOWERS
      AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN HAZE/SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS.  MAINLY FINE.=

    ===================================================================
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 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

    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 18/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.6 C
Minimum Air Temperature                     28.5 C
Grass Minimum Temperature                   26.8 C
Relative Humidity                        60 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2348.7 mm
Against an average of                     2129.7 mm

Other Stations                Min                  Max
King's Park                  28.2 C               33.1 C
Wong Chuk Hang               26.1 C               33.8 C
Ta Kwu Ling                  24.9 C               34.8 C
Lau Fau Shan                 27.4 C               34.3 C
Tai Po                       27.0 C               32.9 C
Sha Tin                      26.2 C               34.9 C
Tuen Mun                     27.1 C               34.3 C
Tseung Kwan O                25.6 C               34.5 C
Sai Kung                     27.1 C               33.3 C
Cheung Chau                  26.6 C               34.4 C
Chek Lap Kok                 28.9 C               35.3 C
Tsing Yi                     27.2 C               33.5 C
Shek Kong                    26.0 C               35.3 C
Tsuen Wan Ho Koon            25.7 C               33.2 C
Tsuen Wan Shing Mun Valley   25.6 C               35.2 C
Hong Kong Park               27.3 C               34.3 C
Shau Kei Wan                 27.9 C               33.4 C
Kowloon City                 28.0 C               34.6 C
Happy Valley                 26.8 C               35.3 C
Wong Tai Sin                 26.2 C               34.2 C
Stanley                      27.3 C               32.8 C
Kwun Tong                    28.0 C               33.8 C
Sham Shui Po                 27.5 C               34.1 C
Kai Tak Runway Park          28.3 C               32.7 C
Yuen Long Park               26.6 C               35.3 C
Tai Mei Tuk               27.0 C               34.6 C

Duration of sunshine (King's Park):              // 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 7.
Sea surface temperature (Waglan Island):        29.7 C 

Yesterday's (17 Sep 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                         0.15
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 17 Sep
     2003copy right image | Important notices | Privacy policy Last revision date: <18 Sep 2017> 

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