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Bulletin issued at 21:02 HKT 19/Dec/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 15 degrees Celsius and the relative humidity 38 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 15 degrees;
Wong Chuk Hang 15 degrees;
Ta Kwu Ling 14 degrees;
Lau Fau Shan 15 degrees;
Tai Po 15 degrees;
Sha Tin 15 degrees;
Tuen Mun 15 degrees;
Tseung Kwan O 15 degrees;
Sai Kung 15 degrees;
Cheung Chau 15 degrees;
Chek Lap Kok 16 degrees;
Tsing Yi 16 degrees;
Shek Kong 15 degrees;
Tsuen Wan Ho Koon 14 degrees;
Tsuen Wan Shing Mun Valley 15 degrees;
Hong Kong Park 15 degrees;
Shau Kei Wan 15 degrees;
Kowloon City 15 degrees;
Happy Valley 16 degrees;
Wong Tai Sin 15 degrees;
Stanley 15 degrees;
Kwun Tong 14 degrees;
Sham Shui Po 16 degrees;
Kai Tak Runway Park 16 degrees;
Yuen Long Park 15 degrees;
Tai Mei Tuk 14 degrees.


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


Climatological Information for 19 Dec

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 20:45 HKT 19/Dec/2017

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

An intense winter monsoon continues to affect southern China.

At 8 p.m., Tropical Storm Kai-tak was centred about 180 kilometres south of Nansha Dao. It is forecast to move west-southwest at about 18 kilometres per hour across the southern part of the South China Sea.

Weather forecast for tonight and tomorrow

Cloudy periods at first. Cold tomorrow morning with a minimum temperature of about 12 degrees in the urban areas, and a couple of degrees lower in the New Territories. Fine and very dry during the day with a maximum temperature of around 18 degrees. Moderate to fresh northerly winds, occasionally strong offshore and on high ground.

Outlook : Remaining cold on Thursday morning. Temperatures rising on Friday and Saturday.


(The above forecast period is valid up to 23:59 HKT tomorrow, 20/12/2017; 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 19/Dec/2017

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

GENERAL SITUATION AT 190900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 191300 UTC:

HONG KONG= N 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. TEMP 11-18 C. =
KWANGTUNG= N TO NE 7-8. FINE. SEA 4-6 M. SWELL NE 3-5 M. =
TAIWAN STRAIT= N TO NE 8-9. FINE. SEA 6-8 M. SWELL NE 3-5 M. =
BASHI= N TO NE 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
PRATAS= N TO NE 7-8, OCNL 9. RAIN PATCHES. SEA UP TO 8 M. SWELL NE 3-5 M. =
BALINTANG= N TO NE 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
SCARBOROUGH= N TO NE 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
PARACEL= N TO NE 8-9. RAIN PATCHES. SEA 6-8 M. SWELL NE 3-5 M. =
TONKIN= N TO NE 7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 2-3 M. =
DANANG= N TO NE 7-8, OCNL 9. RAIN PATCHES. SEA UP TO 8 M. SWELL NE 3-5 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 19:30 HKT 19/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 19 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 continues to affect the south China coastal waters.

    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 to northeast force 7 to 8.
    Rough to very rough seas.

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

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

    Waglan Island Wind north force 5

    Shantou Wind east-northeast force 2
      Visibility 23 Kilometres

    Dongsha Wind northeast force 6
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 5

    Macau Wind north force 3
      Visibility 7 Kilometres

    Xisha Wind north-northeast force 4
      Visibility 7 Kilometres in rain

  • 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 19/DEC/2017
    (Next update at 01:30 HKT 20/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 STORM
     KAI-TAK WAS LOCATED NEAR 9.1 DEGREES NORTH,
     114.9 DEGREES EAST. IT IS FORECAST TO MOVE
     WEST-SOUTHWEST AT ABOUT 10 KNOTS ACROSS THE
     SOUTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15-20
       OFFSHORE:  360/20-25                            16-11
   B.   2000 FT:  020/25-30                            8
   C.   5000 FT:  050/15                               6
   D.  10000 FT:  250/15                               11
   E.  18000 FT:  270/30                               0
   F.  24000 FT:  300/40                               MS15
   G.  30000 FT:  270/40                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1500 TO 1900 FT
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10000 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : NEAR SURFACE, 9800, 13000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS, OCCASIONALLY
     STRONG OFFSHORE AND ON HIGH GROUND. 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.

    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 12:30 HKT 19/Dec/2017


    Tropical Cyclone Warning

    At 190300 UTC, Tropical Storm Kai-tak (1726) with central pressure 995 hectopascals was centred within 90 nautical miles of nine point six degrees north (9.6 N) one one five point four degrees east (115.4 E) and is forecast to move west-southwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 200300 UTC
    Eight point zero degrees north (8.0 N)
    One one two point five degrees east (112.5 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 210300 UTC
    Seven point one degrees north (7.1 N)
    One zero nine point three degrees east (109.3 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 220300 UTC
    Five point nine degrees north (5.9 N)
    One zero six point two degrees east (106.2 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 230300 UTC
    Dissipated over sea.



    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 19/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     15.8 C
Minimum Air Temperature                      9.8 C
Grass Minimum Temperature                    9.7 C
Relative Humidity                        40 - 65 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2385.1 mm

Other Stations                Min                  Max
King's Park                   8.9 C               16.4 C
Wong Chuk Hang                9.7 C               18.0 C
Ta Kwu Ling                   7.5 C               16.2 C
Lau Fau Shan                  7.3 C               15.1 C
Tai Po                        7.8 C               15.7 C
Sha Tin                       8.4 C               16.6 C
Tuen Mun                      8.2 C               16.4 C
Tseung Kwan O                 7.8 C               17.7 C
Sai Kung                      9.2 C               15.5 C
Cheung Chau                   8.6 C               17.0 C
Chek Lap Kok                  9.0 C               16.2 C
Tsing Yi                      8.9 C               17.0 C
Shek Kong                     7.9 C               16.9 C
Tsuen Wan Ho Koon             6.8 C               15.1 C
Tsuen Wan Shing Mun Valley    7.1 C               19.0 C
Hong Kong Park               10.0 C               17.5 C
Shau Kei Wan                  9.9 C               18.2 C
Kowloon City                  8.4 C               17.7 C
Happy Valley                  9.9 C               18.3 C
Wong Tai Sin                  8.4 C               17.3 C
Stanley                      10.7 C               17.9 C
Kwun Tong                     8.5 C               17.2 C
Sham Shui Po                  9.4 C               18.2 C
Kai Tak Runway Park           9.4 C               17.7 C
Yuen Long Park                7.6 C               16.7 C
Tai Mei Tuk                8.1 C               16.1 C

Duration of sunshine (King's Park):              9.4 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):        18.6 C 

Yesterday's (18 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 18 Dec
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