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Bulletin issued at 21:02 HKT 16/Dec/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 13 degrees Celsius and the relative humidity 64 per cent.

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

Please be reminded that:

The Strong Monsoon Signal has been issued.
The Cold Weather Warning is now in force. Cold weather might cause adverse health effects. Members of the public should take care to keep warm.

The air temperatures at other places were:

King's Park 12 degrees;
Wong Chuk Hang 13 degrees;
Ta Kwu Ling 11 degrees;
Lau Fau Shan 12 degrees;
Tai Po 12 degrees;
Sha Tin 12 degrees;
Tuen Mun 13 degrees;
Tseung Kwan O 12 degrees;
Sai Kung 12 degrees;
Cheung Chau 12 degrees;
Chek Lap Kok 13 degrees;
Tsing Yi 12 degrees;
Shek Kong 12 degrees;
Tsuen Wan Ho Koon 10 degrees;
Tsuen Wan Shing Mun Valley 11 degrees;
Hong Kong Park 13 degrees;
Shau Kei Wan 12 degrees;
Kowloon City 11 degrees;
Happy Valley 13 degrees;
Wong Tai Sin 12 degrees;
Stanley 13 degrees;
Kwun Tong 11 degrees;
Sham Shui Po 12 degrees;
Kai Tak Runway Park 13 degrees;
Yuen Long Park 12 degrees;
Tai Mei Tuk 11 degrees.


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


Climatological Information for 16 Dec

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 20:45 HKT 16/Dec/2017

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

An intense winter monsoon is affecting the coastal areas of Guangdong.

At 8 p.m., Tropical Storm Kai-tak was centred about 520 kilometres east-southeast of Manila. It is forecast to move west-southwest at about 14 kilometres per hour across the Philippines.

Weather forecast for tonight and tomorrow

Mainly cloudy overnight. It will become cold. The minimum temperature tomorrow morning will be about 12 degrees in the urban areas, and a couple of degrees lower in the New Territories. Dry with sunny periods during the day. The maximum temperature will be about 16 degrees. Fresh northerly winds, strong offshore and on high ground at first.

Outlook : Cold in the morning in the following couple of days with minimum temperatures remaining at 12 degrees or below.


(The above forecast period is valid up to 23:59 HKT tomorrow, 17/12/2017; 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 16/Dec/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH, PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 160900 UTC:
COLD FRONT 18N 112E 22N 121E 22N 123E 23N 115E S 15KT. TROPICAL STORM KAI-TAK (1726) 988 HPA 12N 125E WSW 8 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= N 7-8. FINE. SEA 4-6 M. SWELL NE 2-3 M. TEMP 12-16 C. =
KWANGTUNG= N 7-8, OCNL 9 IN E. FINE. SEA 4-6 M, UP TO 8 M IN E. SWELL NE 3-5 M. =
TAIWAN STRAIT= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
BASHI= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
PRATAS= N 8, OCNL 9. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 3-5 M. =
BALINTANG= N 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
SCARBOROUGH= N 8-9. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 3-5 M. =
PARACEL= N 8. RAIN PATCHES. SEA 6 M. SWELL NE 3-5 M. =
TONKIN= N 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
DANANG= N 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 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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    Bulletin issued at 19:30 HKT 16/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 16 December 2017

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    An intense winter monsoon is affecting the south China coastal waters.

    At 7 p.m., Tropical Storm Kai-tak with maximum sustained winds of about 85 kilometres per hour near its centre was located near 12.1 degrees north, 125.1 degrees east. It is forecast to move west-southwest at about 14 kilometres per hour across the Philippines.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 7 to 8.
    Rough to very rough seas.

    Nan'ao:
    North force 8, occasionally force 9.
    Very rough to high seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    North force 7 to 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Northerly winds of force 7 to 8.

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

    Waglan Island Wind north force 7
      Visibility 39 Kilometres

    Dongsha Wind north-northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 6

    Macau Wind north force 4
      Visibility 7 Kilometres

    Xisha Wind northeast force 3
      Visibility 11 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 17:30 HKT 16/DEC/2017
    (Next update at 01:30 HKT 17/DEC/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS. SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE WINTER MONSOON IS AFFECTING THE COASTAL AREAS
     OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15-20
       OFFSHORE:  360/25-30, OCNL 35                   16-10
   B.   2000 FT:  020/25-30, OCNL 35                   10-6
   C.   5000 FT:  040/25                               7
   D.  10000 FT:  300/20                               4
   E.  18000 FT:  300/30                               0
   F.  24000 FT:  280/30                               MS12
   G.  30000 FT:  280/30                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2200-3600 FT.
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 3500 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 18000 FT      
      0 DEG. C LEVEL(S) : 2200, 6000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 20 DEG
IV.  FURTHER OUTLOOK: 
     FRESH NORTHERLY WINDS, STRONG OFFSHORE. MAINLY CLOUDY.
     SUNNY PERIODS TOMORROW.=

    ===================================================================
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 20:11 HKT on 01 Dec 17

    VHHK SIGMET 4 VALID 010820/011220 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1642 E11400 - N1736 E11312 - N1812 E11512 - N1642 E11400 TOP FL450 MOV W 05KT NC= VHHK SIGMET 5 VALID 011220/011620 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1806 E11506 - N1642 E11400 - N1712 E11330 - N1818 E11448 - N1806 E11506 TOP FL420 MOV W 05KT WKN=

    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

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    Bulletin issued at 21:30 HKT 16/Dec/2017


    Tropical Cyclone Warning

    TROPICAL STORM KAI-TAK (1726) has entered the area of responsibility of the Hong Kong Observatory.

    At 161200 UTC, Tropical Storm Kai-tak (1726) with central pressure 988 hectopascals was centred within 90 nautical miles of one two point zero degrees north (12.0 N) one two five point zero degrees east (125.0 E) and is forecast to move west-southwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 2 metre waves 150 nautical miles.

    Forecast position and intensity at 171200 UTC
    One one point one degrees north (11.1 N)
    One two one point seven degrees east (121.7 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 181200 UTC
    One zero point eight degrees north (10.8 N)
    One one eight point zero degrees east (118.0 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 191200 UTC
    Nine point six degrees north (9.6 N)
    One one five point three degrees east (115.3 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 201200 UTC
    Eight point five degrees north (8.5 N)
    One one two point eight degrees east (112.8 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 211200 UTC
    Seven point six degrees north (7.6 N)
    One zero nine point eight degrees east (109.8 E)
    Maximum winds 50 knots.



    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 16/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     21.3 C
Minimum Air Temperature                     18.5 C
Grass Minimum Temperature                   17.1 C
Relative Humidity                        76 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2383.2 mm

Other Stations                Min                  Max
King's Park                  18.1 C               22.5 C
Wong Chuk Hang               18.4 C               22.8 C
Ta Kwu Ling                  18.3 C               23.5 C
Lau Fau Shan                 17.9 C               21.7 C
Tai Po                       18.6 C               21.2 C
Sha Tin                      18.7 C               22.7 C
Tuen Mun                     18.2 C               22.6 C
Tseung Kwan O                17.6 C               22.1 C
Sai Kung                     18.6 C               21.0 C
Cheung Chau                  18.0 C               22.5 C
Chek Lap Kok                 17.8 C               23.1 C
Tsing Yi                     18.7 C               22.6 C
Shek Kong                    18.6 C               22.4 C
Tsuen Wan Ho Koon            16.6 C               22.3 C
Tsuen Wan Shing Mun Valley   18.3 C               22.3 C
Hong Kong Park               18.5 C               21.4 C
Shau Kei Wan                 18.0 C               21.3 C
Kowloon City                 17.9 C               23.7 C
Happy Valley                 18.6 C               23.2 C
Wong Tai Sin                 18.0 C               24.0 C
Stanley                      18.3 C               20.8 C
Kwun Tong                    17.9 C               22.0 C
Sham Shui Po                 18.7 C               23.7 C
Kai Tak Runway Park          18.9 C               21.9 C
Yuen Long Park               18.2 C               21.9 C
Tai Mei Tuk               18.1 C               22.9 C

Duration of sunshine (King's Park):              5.2 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
Sea surface temperature (Waglan Island):        19.9 C 

Yesterday's (15 Dec 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                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 15 Dec
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