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Bulletin issued at 21:02 HKT 17/Dec/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 12 degrees Celsius and the relative humidity 64 per cent.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.
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 10 degrees;
Wong Chuk Hang 11 degrees;
Ta Kwu Ling 10 degrees;
Lau Fau Shan 10 degrees;
Tai Po 11 degrees;
Sha Tin 11 degrees;
Tuen Mun 11 degrees;
Tseung Kwan O 10 degrees;
Sai Kung 11 degrees;
Cheung Chau 11 degrees;
Chek Lap Kok 11 degrees;
Tsing Yi 11 degrees;
Shek Kong 10 degrees;
Tsuen Wan Ho Koon 9 degrees;
Tsuen Wan Shing Mun Valley 10 degrees;
Hong Kong Park 12 degrees;
Shau Kei Wan 10 degrees;
Kowloon City 10 degrees;
Happy Valley 12 degrees;
Wong Tai Sin 10 degrees;
Stanley 11 degrees;
Kwun Tong 10 degrees;
Sham Shui Po 11 degrees;
Kai Tak Runway Park 11 degrees;
Yuen Long Park 11 degrees;
Tai Mei Tuk 10 degrees.

Here is the information on Tropical Depression Kai-tak at 8 p.m.:
Location: 11.5 degrees north, 121.5 degrees east.


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


Climatological Information for 17 Dec

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 20:45 HKT 17/Dec/2017

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

An intense winter monsoon is bringing cold weather to Guangdong.

At 8 p.m., Tropical Depression Kai-tak was centred about 340 kilometres south of Manila. It is forecast to move west-southwest at about 16 kilometres per hour across the Philippines.

Weather forecast for tonight and tomorrow

Cloudy periods tonight and tomorrow morning. Cold with a minimum temperature of about 10 degrees in the urban areas, and a few degrees lower in the New Territories. Fine and very dry during the day tomorrow. The maximum temperature will be around 17 degrees. Moderate to fresh northerly winds.

Outlook : Fine and dry with cold mornings in the following couple of days. Temperatures rising slightly in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/12/2017; 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 17/Dec/2017

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

GENERAL SITUATION AT 170900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION KAI-TAK (1726), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= N 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. TEMP 10-17 C. =
KWANGTUNG= N 7-8. FINE. SEA 4-6 M. SWELL NE 3-5 M. =
TAIWAN STRAIT= N 8-9. FINE. SEA 6-8 M. SWELL NE 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 8 M. SWELL NE 3-5 M. =
BALINTANG= N TO NE 8-9. ISOL SHOWERS AND TS. SEA 6-8 M. SWELL NE 3-5 M. =
SCARBOROUGH= N TO NE 8-9. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL NE 3-5 M. =
PARACEL= N 8. ISOL SHOWERS AND TS. SEA 6 M. SWELL NE 3-5 M. =
TONKIN= N 7-8. FINE. 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 19:30 HKT 17/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 17 December 2017

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

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

    At 7 p.m., Tropical Depression Kai-tak with maximum sustained winds of about 55 kilometres per hour near its centre was located near 11.6 degrees north, 121.6 degrees east. It is forecast to move west-southwest at about 16 kilometres per hour across the Philippines.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7.
    Rough seas.

    Nan'ao, 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 6
      Visibility 11 Kilometres

    Dongsha Wind north-northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northeast force 4

    Macau Wind north force 4
      Visibility 7 Kilometres

    Xisha Wind north-northeast force 4
      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 17:30 HKT 17/DEC/2017
    (Next update at 01:30 HKT 18/DEC/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE WINTER MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 4 P.M., TROPICAL DEPRESSION KAI-TAK WAS
     CENTERED NEAR 11.9 DEGREES NORTH, 122.2 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST-SOUTHWEST AT
     ABOUT 8 KNOTS ACROSS THE PHILIPPINES.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10-15
       OFFSHORE:  010/15-20, OCNL 25                   13-10
   B.   2000 FT:  040/20-25                            6
   C.   5000 FT:  110/15                               5
   D.  10000 FT:  290/20                               5
   E.  18000 FT:  300/20                               1
   F.  24000 FT:  280/20                               MS15
   G.  30000 FT:  250/25                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT SCT 4500 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 18500 FT      10 DEG. C LEVEL(S) : NEAR SURFACE, 11000, 13000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 21 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, FRESH OFFSHORE. MAINLY
     FINE.=

    ===================================================================
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.

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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 17/Dec/2017


    Tropical Cyclone Warning

    At 171200 UTC, Tropical Depression Kai-tak (1726) with central pressure 998 hectopascals was centred within 90 nautical miles of one one point five degrees north (11.5 N) one two one point five degrees east (121.5 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 30 knots.

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 181200 UTC
    One zero point eight degrees north (10.8 N)
    One one eight point five degrees east (118.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 191200 UTC
    Nine point four degrees north (9.4 N)
    One one five point six degrees east (115.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 201200 UTC
    Eight point eight degrees north (8.8 N)
    One one two point four degrees east (112.4 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 211200 UTC
    Seven point eight degrees north (7.8 N)
    One zero eight point two degrees east (108.2 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 221200 UTC
    Seven point three degrees north (7.3 N)
    One zero four point five degrees east (104.5 E)
    Maximum winds 40 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 17/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     19.5 C
Minimum Air Temperature                     12.2 C
Grass Minimum Temperature                   12.3 C
Relative Humidity                        59 - 78 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2383.7 mm

Other Stations                Min                  Max
King's Park                  11.5 C               19.2 C
Wong Chuk Hang               12.4 C               19.1 C
Ta Kwu Ling                  10.8 C               18.4 C
Lau Fau Shan                 11.0 C               17.9 C
Tai Po                       11.6 C               19.0 C
Sha Tin                      11.9 C               19.4 C
Tuen Mun                     11.8 C               18.2 C
Tseung Kwan O                11.5 C               18.8 C
Sai Kung                     11.7 C               18.8 C
Cheung Chau                  11.4 C               18.0 C
Chek Lap Kok                 12.1 C               18.0 C
Tsing Yi                     12.0 C               19.1 C
Shek Kong                    11.4 C               18.6 C
Tsuen Wan Ho Koon             9.9 C               17.4 C
Tsuen Wan Shing Mun Valley   10.5 C               19.0 C
Hong Kong Park               12.7 C               19.8 C
Shau Kei Wan                 11.8 C               18.6 C
Kowloon City                 11.0 C               18.9 C
Happy Valley                 12.5 C               19.6 C
Wong Tai Sin                 11.2 C               18.9 C
Stanley                      12.2 C               18.8 C
Kwun Tong                    11.1 C               18.7 C
Sham Shui Po                 11.7 C               19.7 C
Kai Tak Runway Park          12.3 C               19.7 C
Yuen Long Park               11.1 C               18.5 C
Tai Mei Tuk               10.7 C               18.4 C

Duration of sunshine (King's Park):              6.1 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 6.
Sea surface temperature (Waglan Island):        19.2 C 

Yesterday's (16 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                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
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 16 Dec
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