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Bulletin issued at 11:02 HKT 09/Oct/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 64 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Please be reminded that:

The Strong Monsoon Signal has been issued.

The air temperatures at other places were:

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

Here is the information on Tropical Depression at 10 a.m.:
Location: 15.9 degrees north, 111.5 degrees east.


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

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Bulletin updated at 10:45 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.

At 10 a.m., the tropical depression over the central part of the South China Sea was centred at about 140 kilometres southwest of Xisha. It is forecast to move west-northwest at about 25 kilometres per hour towards Vietnam.

Weather forecast for today

Mainly cloudy with one or two showers. Sunny intervals during the day. Moderate to fresh east to northeasterly winds, strong offshore at first.

Outlook : Sunny periods and one or two showers in the next 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 09:00 HKT 09/Oct/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS AND BALINTANG.

GENERAL SITUATION AT 082100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION OVER CENTRAL PART OF THE SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 090100 UTC:

HONG KONG= E TO NE 6-7, OCNL 8 AT FIRST. ISOL SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL E TO NE 2 M. TEMP 30-27 C. =
KWANGTUNG= E TO NE 7, OCNL 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4 M, UP TO 6 M AT FIRST. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7, 8 AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4 M, 6 M AT FIRST. SWELL NE 3 M. =
BASHI= E 7, 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4 M, 6 M AT FIRST. SWELL NE 3-4 M. =
PRATAS= E 7, OCNL 8 AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4 M, UP TO 6 M AT FIRST. SWELL NE 3 M. =
BALINTANG= E 7, 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4 M, 6 M AT FIRST. SWELL NE 3-4 M. =
SCARBOROUGH= E TO SE 6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3-4 M. =
PARACEL= CYCLONIC 6-7, E TO SE UP TO 7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
TONKIN= NE 6-7, CYCLONIC UP TO 7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NE 6-7, CYCLONIC UP TO 7 LATER. DOWN TO 500 M IN FRQ 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.


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  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 09/Oct/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 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.

    At 9 a.m., the tropical depression over the central part of the South China Sea with maximum sustained winds of about 45 kilometres per hour near its centre was located at 15.9 degrees north, 111.7 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour towards Vietnam.

    Area forecasts for the next 24 hours

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

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

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6, occasionally force 7. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 6

    Shantou Wind northeast force 1
      Visibility 30 Kilometres

    Macau Wind north-northeast force 3
      Visibility 21 Kilometres

    Xisha Wind east-southeast force 3
      Visibility 7 Kilometres in showers

  • 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 09/OCT/2017
    (Next update at 17:30 HKT 09/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A STRONG NORTHEAST MONSOON IS AFFECTING THE
     COAST OF GUANGDONG. 
     AT 8 A.M., THE TROPICAL DEPRESSION OVER THE
     CENTRAL PART OF THE SOUTH CHINA SEA WAS CENTRED
     NEAR 15.9 DEGREES NORTH, 112.2 DEGREES EAST. IT
     IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 14
     KNOTS TOWARDS VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
       OFFSHORE:  080/20-25, OCNL 30G45                29-32
   B.   2000 FT:  080/25-30, OCNL 35                   24
   C.   5000 FT:  100/40                               18
   D.  10000 FT:  110/45                               13
   E.  18000 FT:  090/35                               0
   F.  24000 FT:  100/30                               MS11
   G.  30000 FT:  090/20                               MS27
   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 2500 FT SCT 3500 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000M IN SHOWERS
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : SEV OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE. MAINLY CLOUDY WITH
     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 11:15 HKT on 09 Oct 17

    VHHK SIGMET 1 VALID 090315/090715 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1654 E11348 - N1930 E11130 - N2124 E11130 - N2136 E11154 - N2048 E11430 - N1824 E11436 - N1654 E11348 TOP FL450 MOV W 10KT NC= VHHK SIGMET 6 VALID 082315/090315 VHHH- VHHK HONG KONG FIR EMBD TS FCST SW OF LINE N2130 E11236 - N1820 E11520 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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 09:30 HKT 09/Oct/2017


    Tropical Cyclone Warning

    At 090000 UTC, the tropical depression over the central part of South China Sea with central pressure 1000 hectopascals was centred within 90 nautical miles of one five point nine degrees north (15.9 N) one one two point two degrees east (112.2 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 100000 UTC
    One eight point zero degrees north (18.0 N)
    One zero six point three degrees east (106.3 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 110000 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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
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