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Bulletin issued at 00:02 HKT 12/Oct/2017

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 77 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 12 Oct

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Bulletin updated at 00:00 HKT 12/Oct/2017

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

An anticyclone aloft brought generally fine weather to southern China yesterday. Locally, there were one or two rain patches yesterday morning, mainly fine and hot during the day. Temperatures over many places rose to around 33 degrees in the afternoon. The anticyclone aloft will continue to bring generally fine weather to southern China today. The northeast monsoon will affect the coast of Guangdong gradually today. It will be cooler over the region in the next couple of days.

Weather forecast for Hong Kong (Thursday, 12 Oct 2017)

Cloudy periods with one or two rain patches in the morning and at night. The minimum temperature will be about 27 degrees. Mainly fine and hot with some haze during the day. The maximum temperature will be around 32 degrees in the urban areas, and a couple of degrees higher in the New Territories. Moderate northeasterly winds, freshening later.

Outlook : Sunny periods on Friday. 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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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 11/Oct/2017

GALE WARNING AREAS: KWANGTUNG AND TAIWAN STRAIT.

GENERAL SITUATION AT 110900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. ONE OR TWO RAIN PATCHES. SEA UP TO 2 M. SWELL E TO NE 2 M. TEMP 27-32 C. =
KWANGTUNG= E TO NE 5-6, UP TO 8 IN E. ISOL SHOWERS AND TS IN W. SEA 2-3 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 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
PRATAS= E 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
BALINTANG= E 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3-4 M. =
SCARBOROUGH= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= E TO NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2-3 M. =
TONKIN= E TO NE 4-5. ISOL SHOWERS AND TS. SEA 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 11/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 11 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:
    An easterly airstream is affecting the south China coastal waters.

    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.
    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. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 13 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Macau Wind south-southeast force 2
      Visibility 19 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 3800 Metres in showers

  • 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 22:30 HKT 11/OCT/2017
    (Next update at 01:30 HKT 12/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH CHINA COASTAL
     AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2230 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10-15
       OFFSHORE:  090/20-25, OCNL 30 AT FIRST          31-29
   B.   2000 FT:  080/15-20, OCNL 25 AT FIRST          24
   C.   5000 FT:  070/20                               19
   D.  10000 FT:  080/20                               11
   E.  18000 FT:  080/15                               MS4
   F.  24000 FT:  090/15                               MS4
   G.  30000 FT:  040/30                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY PERIODS WITH ONE OR TWO RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 4500 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD NEAR HILLS AND OFFSHORE.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHEASTERLY WINDS, OCCASIONALLY FRESH OFFSHORE.
     MAINLY FINE AND HOT WITH SOME HAZE DURING THE DAY.=

    ===================================================================
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 05:17 HKT on 11 Oct 17

    VHHK SIGMET 8 VALID 101730/102130 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1830 E11530 - N1642 E11400 - N1930 E11130 - N2106 E11130 - N2012 E11448 - N1830 E11530 TOP FL430 MOV W 15KT NC= VHHK SIGMET 10 VALID 102130/110130 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1724 E11436 - N1642 E11400 - N1842 E11212 - N1900 E11312 - N1818 E11436 - N1724 E11436 TOP FL430 MOV W 15KT 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
     2003copy right image | Important notices | Privacy policy Last revision date: <12 Oct 2017> 

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