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Bulletin issued at 16:02 HKT 23/Dec/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 70 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 20 degrees;
Tai Po 21 degrees;
Sha Tin 21 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 20 degrees;
Cheung Chau 20 degrees;
Chek Lap Kok 20 degrees;
Tsing Yi 21 degrees;
Shek Kong 23 degrees;
Tsuen Wan Ho Koon 20 degrees;
Tsuen Wan Shing Mun Valley 22 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 20 degrees;
Kowloon City 21 degrees;
Happy Valley 22 degrees;
Wong Tai Sin 21 degrees;
Stanley 20 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 20 degrees;
Yuen Long Park 22 degrees;
Tai Mei Tuk 21 degrees.


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


Climatological Information for 23 Dec

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 16:15 HKT 23/Dec/2017

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

Pressure over central China is rising. The associated replenishment of the northeast monsoon will bring generally fine and dry weather to the coast of Guangdong tomorrow.

At 4 p.m., Severe Tropical Storm Tembin was centred about 540 kilometres southeast of Nansha Dao. It is forecast to move west at about 20 kilometres per hour across the southern part of the Philippines, entering the southern part of the South China Sea.

Weather forecast for tonight and tomorrow

Becoming fine and dry overnight. Mild during the day but becoming cool at night tomorrow. Temperatures will range between 17 and 22 degrees. Moderate east to northeasterly winds. Becoming northerlies tomorrow, fresh offshore.

Outlook : Mainly fine and dry with cool mornings during Christmas and the day after.


(The above forecast period is valid up to 23:59 HKT tomorrow, 24/12/2017; 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 09:00 HKT 23/Dec/2017

N0 WARNING.

GENERAL SITUATION AT 222100 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 230100 UTC:

HONG KONG= E TO NE 5-6, N 6 LATER. FINE. SEA 2-3 M. SWELL E 2 M. TEMP 20-17 C. =
KWANGTUNG= E TO NE 6-7, N 6-7 LATER. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE 2-3 M. =
BASHI= E TO NE 6-7, N 6-7 LATER. FINE. SEA 3-4 M. SWELL NE 3 M. =
PRATAS= E TO NE 6-7, N 6-7 LATER. FINE. SEA 3-4 M. SWELL NE 3 M. =
BALINTANG= E TO NE 7, N 6-7 LATER. ISOL SHOWERS. SEA 3-4 M. SWELL NE 3-5 M. =
SCARBOROUGH= E TO NE 7, N 6-7 LATER. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-5 M. =
PARACEL= E TO NE 7, N 6-7 LATER. ISOL SHOWERS. SEA 3-4 M. SWELL NE 3 M. =
TONKIN= E TO NE 5-6, N 6-7 LATER. FINE. SEA 2-3 M, UP TO 4 M LATER. SWELL NE 2 M. =
DANANG= E TO NE 6, N 6-7 LATER. RAIN PATCHES. SEA 3 M, UP TO 4 M LATER. SWELL NE 2-3 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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 16:30 HKT 23/Dec/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 23 December 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A replenishment of the northeast monsoon will reach the south China coastal waters tomorrow.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, becoming north force 6.
    Moderate seas, becoming rough.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to northeast force 5 to 6, becoming north force 6.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7.

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

    Waglan Island Wind east-northeast force 2
      Visibility 17 Kilometres

    Shantou Wind northwest force 1
      Visibility 22 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 4

    Macau Wind southeast force 1
      Visibility 11 Kilometres

    Xisha Wind northeast force 2
      Visibility 18 Kilometres

  • Explanation of Seas or Sea Waves
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  • Map showing forecast areas
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 23/DEC/2017
    (Next update at 17:30 HKT 23/DEC/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH CHINA COASTAL
     AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  060/5-10
       OFFSHORE:  080/10-15, OCNL 20                   18-22
   B.   2000 FT:  080/10-15                            15
   C.   5000 FT:  200/10                               11
   D.  10000 FT:  260/20                               6
   E.  18000 FT:  280/30                               MS2
   F.  24000 FT:  280/30                               MS13
   G.  30000 FT:  280/40                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY. SUNNY PERIODS IN THE AFTERNOON.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT  SCT 8000 FT
   K. VISIBILITY    : 7 KM.
   L. 0 DEG. C LEVEL: 16500 FT. 
      10 DEG. C LEVEL(S) : 5600, 6400, 8400 FT.
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE EAST TO NORTHEASTERLY WINDS.
     MAINLY CLOUDY.=

    ===================================================================
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

    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 23/Dec/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     19.1 C
Minimum Air Temperature                     14.5 C
Grass Minimum Temperature                   11.8 C
Relative Humidity                        51 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2386.7 mm

Other Stations                Min                  Max
King's Park                  14.2 C               20.5 C
Wong Chuk Hang               15.0 C               21.2 C
Ta Kwu Ling                   9.7 C               22.8 C
Lau Fau Shan                 12.0 C               22.5 C
Tai Po                       12.9 C               19.6 C
Sha Tin                      13.3 C               21.8 C
Tuen Mun                     13.3 C               22.2 C
Tseung Kwan O                13.1 C               21.6 C
Sai Kung                     13.7 C               18.6 C
Cheung Chau                  14.7 C               20.5 C
Chek Lap Kok                 15.3 C               21.9 C
Tsing Yi                     13.6 C               21.8 C
Shek Kong                    12.6 C               22.4 C
Tsuen Wan Ho Koon            11.6 C               21.9 C
Tsuen Wan Shing Mun Valley   12.1 C               22.9 C
Hong Kong Park               14.5 C               21.2 C
Shau Kei Wan                 14.4 C               20.0 C
Kowloon City                 13.7 C               22.7 C
Happy Valley                 14.7 C               20.5 C
Wong Tai Sin                 14.2 C               22.2 C
Stanley                      15.0 C               19.3 C
Kwun Tong                    14.1 C               20.2 C
Sham Shui Po                 14.1 C               22.8 C
Kai Tak Runway Park          15.5 C               19.8 C
Yuen Long Park               12.1 C               23.8 C
Tai Mei Tuk               13.8 C               21.2 C

Duration of sunshine (King's Park):              8.9 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):        17.8 C 

Yesterday's (22 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 22 Dec
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