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Bulletin issued at 04:02 HKT 09/Oct/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 73 per cent.

Strong winds are expected from the east. The public should beware of the possible danger brought by rough seas.

Please be reminded that:

The Strong Monsoon Signal has been issued.

The air temperatures at other places were:

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


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


Climatological Information for 9 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 03:45 HKT 09/Oct/2017

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

A strong northeast monsoon is affecting the coast of Guangdong. Besides, an area of low pressure over the central part of the South China Sea is bringing showers to the northern part of the South China Sea.

Weather forecast for today

Mainly cloudy with a few showers. Sunny intervals during the day. Temperatures will range between 27 and 30 degrees. Moderate to fresh east to northeasterly winds, strong offshore at first.

Outlook : 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, 09/10/2017; 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 08/Oct/2017

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH AND TONKIN.

GENERAL SITUATION AT 080900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. LOW 1002 HPA 16N 115E W 15KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 081300 UTC:

HONG KONG= E TO NE 5-6, OCNL 7. ISOL SHOWERS. SEA UP TO 4 M. SWELL E TO NE 2 M. TEMP 27-30 C. =
KWANGTUNG= E TO NE 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3 M. =
BASHI= E 7-8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
PRATAS= E 7-8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3 M. =
BALINTANG= E 7-8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
SCARBOROUGH= E TO SE 6-7, OCNL 8 IN N. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN N. SWELL NE 3-4 M. =
PARACEL= E TO NE 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
TONKIN= E TO NE 6-7, OCNL 8 LATER. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2 M. =
DANANG= E TO NE 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL 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

    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 09/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 09 October 2017

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    An intense northeast monsoon is affecting the south China coastal waters. Besides, an area of low pressure is bringing unsettled weather to the central part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 6 to 7, occasionally force 8.
    Isolated showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao:
    East to northeast force 7 to 8.
    Scattered heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    East to northeast force 7, occasionally force 8.
    Scattered heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

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

    Waglan Island Wind east-northeast force 7

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 5
      Visibility 10 Kilometres

    Macau Wind northeast force 3
      Visibility 16 Kilometres

    Xisha Wind east force 3
      Visibility 18 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 01:30 HKT 09/OCT/2017
    (Next update at 9:00-9:30 HKT 09/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     SEV TURB. GALE FORCE WINDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE NORTHEAST MONSOON IS AFFECTING THE
     SOUTH CHINA COASTAL WATERS. BESIDES, AN AREA OF
     LOW PRESSURE IS BRINGING UNSETTLED WEATHER TO
     THE CENTRAL PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15, OCNL 20 AT FIRST
       OFFSHORE:  080/25-30, OCNL 35 AT FIRST          29-31
   B.   2000 FT:  080/25-30, OCNL 35 AT FRIST          23
   C.   5000 FT:  090/30                               19
   D.  10000 FT:  100/30                               11
   E.  18000 FT:  100/35                               MS3
   F.  24000 FT:  080/25                               MS14
   G.  30000 FT:  060/20                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS. SUNNY
      INTERVALS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT. SCT 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000M IN SHOWERS
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : SEV
   N. SEA STATE     : 3.0-5.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, FRESH OFFSHORE. SUNNY
     INTERVALS AND 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.

    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 03:15 HKT on 09 Oct 17

    VHHK SIGMET 4 VALID 081515/081915 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1830 E11224 - N2048 E11406 - N2230 E11730 - N2100 E11730 TOP FL450 MOV W 10KT NC= VHHK SIGMET 5 VALID 081915/082315 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1818 E11512 - N1812 E11236 - N2130 E11406 - N2224 E11730 - N2100 E11730 TOP FL450 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 09/Oct/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.5 C
Minimum Air Temperature                     27.3 C
Grass Minimum Temperature                   26.5 C
Relative Humidity                        66 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2461.2 mm
Against an average of                     2269.5 mm

Other Stations                Min                  Max
King's Park                  26.9 C               31.4 C
Wong Chuk Hang               27.8 C               31.8 C
Ta Kwu Ling                  24.9 C               32.9 C
Lau Fau Shan                 25.7 C               32.7 C
Tai Po                       26.6 C               30.4 C
Sha Tin                      27.0 C               32.3 C
Tuen Mun                     26.2 C               33.1 C
Tseung Kwan O                26.0 C               32.0 C
Sai Kung                     27.1 C               30.6 C
Cheung Chau                  26.9 C               31.9 C
Chek Lap Kok                 28.0 C               33.9 C
Tsing Yi                     26.9 C               32.4 C
Shek Kong                    25.8 C               32.5 C
Tsuen Wan Ho Koon            25.1 C               30.9 C
Tsuen Wan Shing Mun Valley   25.6 C               31.6 C
Hong Kong Park               27.1 C               31.1 C
Shau Kei Wan                 26.6 C               31.1 C
Kowloon City                 26.6 C               31.8 C
Happy Valley                 27.6 C               32.0 C
Wong Tai Sin                 26.9 C               31.3 C
Stanley                      27.6 C               30.3 C
Kwun Tong                    26.2 C               31.9 C
Sham Shui Po                 26.9 C               33.0 C
Kai Tak Runway Park          27.6 C               30.9 C
Yuen Long Park               26.3 C               34.0 C
Tai Mei Tuk               26.5 C               32.0 C

Duration of sunshine (King's Park):              6.8 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):        29.3 C 

Yesterday's (08 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                             0.09
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                         0.14
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 08 Oct
     2003copy right image | Important notices | Privacy policy Last revision date: <09 Oct 2017> 

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