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Bulletin issued at 10:02 HKT 12/Oct/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 68 per cent.
During the past hour the mean UV Index recorded at King's Park was 4. The intensity of UV radiation was moderate.

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


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


Climatological Information for 12 Oct

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 09:45 HKT 12/Oct/2017

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

Under the influence of an anticyclone aloft, the weather is generally fine over southern China.

The area of low pressure to the east of the Philippines has intensified into a tropical depression. At 10 a.m., the tropical depression was centred about 620 kilometres east-northeast of Manila. It is forecast to move west at about 22 kilometres per hour towards Luzon and intensify gradually.

Weather forecast for today

Mainly fine. Hot in the afternoon. Becoming cloudy with one or two rain patches tonight. Moderate northeasterly winds, freshening tonight.

Outlook : Sunny periods tomorrow. Windy and cooler with rain over the weekend and early next week.


(The above forecast period is valid up to 23:59 HKT today, 12/10/2017; 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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Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 12/Oct/2017

GALE WARNING AREAS: KWANGTUNG AND TAIWAN STRAIT.

GENERAL SITUATION AT 112100 UTC:
A NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. DOWN TO 4000 M IN SOME HAZE LATER. ONE OR TWO RAIN PATCHES AT NIGHT. SEA UP TO 2 M. SWELL E TO NE 2 M. TEMP 32-25 C. =
KWANGTUNG= E TO NE 6-7, UP TO 8 IN E. ISOL SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN E. SWELL E TO NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3-4 M. =
BASHI= E 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
PRATAS= E 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
BALINTANG= E 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
SCARBOROUGH= E TO NE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2-3 M. =
TONKIN= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO NE UP TO 2 M. =
DANANG= E TO NE 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL E TO NE 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 10:00 HKT 12/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:00 a.m. on 12 October 2017

    Warnings:
    Gale force winds in Nan'ao. Strong winds in Hong Kong adjacent waters, Shanwei, south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    The northeast monsoon will affect the south China coastal waters gradually today. Besides, the area of low pressure over the seas east of the Philippines has intensified into a tropical depression. At 10 a.m., the tropical depression with maximum sustained winds of about 45 kilometres per hour near its centre was located at 17.3 degrees north, 126.0 degrees east. It is forecast to move west at about 22 kilometres per hour towards Luzon and intensify gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, occasionally force 6.
    One or two rain patches. Some haze later.
    Moderate to rough seas.

    Nan'ao:
    East to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shanwei:
    East to northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    South of Hong Kong:
    East to northeast force 5 to 6.
    Moderate to rough seas.

    Shangchuan Dao:
    East to northeast force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6 to 7, up to force 8 later. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 3
      Visibility 9 Kilometres

    Shantou Wind southeast force 1
      Visibility 26 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Macau Wind north-northeast force 2
      Visibility 17 Kilometres

    Xisha Wind east-northeast force 3
      Visibility 17 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 09:30 HKT 12/OCT/2017
    (Next update at 17:30 HKT 12/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     UNDER THE INFLUENCE OF AN ANTICYCLONE ALOFT, THE
     WEATHER IS GENERALLY FINE OVER SOUTHERN CHINA.
     BESIDES, THE AREA OF LOW PRESSURE OVER THE SEAS
     EAST OF THE PHILIPPINES IS INTENSIFYING
     GRADUALLY, A TROPICAL CYCLONE APPEARS TO BE
     FORMING.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/10-15
       OFFSHORE:  030/15-20                            30-34
   B.   2000 FT:  030/15-20                            25
   C.   5000 FT:  040/20                               18
   D.  10000 FT:  040/20                               12
   E.  18000 FT:  080/15                               MS3
   F.  24000 FT:  100/15                               MS13
   G.  30000 FT:  090/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE WITH ONE OR TWO ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT SCT 5000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS, FRESH
     OFFSHORE. MAINLY CLOUDY WITH ONE OR TWO RAIN
     PATCHES.=

    ===================================================================
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 07:00 HKT on 12 Oct 17

    VHHK SIGMET 3 VALID 112300/120300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1830 E11530 - N1900 E11500 - N2100 E11500 - N2100 E11730 - N2100 E11730 TOP FL400 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 12/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.5 C
Minimum Air Temperature                     28.3 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        60 - 81 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January          2461.4 mm
Against an average of                     2279.9 mm

Other Stations                Min                  Max
King's Park                  27.4 C               32.0 C
Wong Chuk Hang               28.8 C               32.5 C
Ta Kwu Ling                  26.7 C               33.7 C
Lau Fau Shan                 27.5 C               34.3 C
Tai Po                       28.3 C               31.7 C
Sha Tin                      28.7 C               32.9 C
Tuen Mun                     27.8 C               32.8 C
Tseung Kwan O                27.5 C               32.9 C
Sai Kung                     28.6 C               30.9 C
Cheung Chau                  27.5 C               32.1 C
Chek Lap Kok                 28.7 C               35.0 C
Tsing Yi                     27.9 C               33.2 C
Shek Kong                    28.4 C               33.4 C
Tsuen Wan Ho Koon            26.5 C               31.9 C
Tsuen Wan Shing Mun Valley   27.4 C               33.3 C
Hong Kong Park               27.9 C               30.8 C
Shau Kei Wan                 28.1 C               31.1 C
Kowloon City                 28.0 C               32.8 C
Happy Valley                 28.8 C               33.3 C
Wong Tai Sin                 28.1 C               32.9 C
Stanley                      28.3 C               31.1 C
Kwun Tong                    28.0 C               31.7 C
Sham Shui Po                 28.2 C               33.8 C
Kai Tak Runway Park          28.9 C               31.5 C
Yuen Long Park               29.0 C               34.4 C
Tai Mei Tuk               27.5 C               32.3 C

Duration of sunshine (King's Park):              10.4 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 9.
Sea surface temperature (Waglan Island):        29.3 C 

Yesterday's (11 Oct 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                             0.08
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                          0.08
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 11 Oct
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