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Bulletin issued at 10:02 HKT 21/Dec/2018

At 10 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 86 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 24 degrees;
Lau Fau Shan 24 degrees;
Tai Po 22 degrees;
Sha Tin 23 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 22 degrees;
Sai Kung 23 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 24 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 23 degrees;
Shau Kei Wan 22 degrees;
Kowloon City 25 degrees;
Happy Valley 24 degrees;
Wong Tai Sin 25 degrees;
Stanley 22 degrees;
Kwun Tong 22 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 24 degrees;
Tai Mei Tuk 24 degrees.


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


Climatological Information for 21 Dec

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 09:45 HKT 21/Dec/2018

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

A relatively warm and humid easterly airstream is affecting the coast of Guangdong.

Weather forecast for today

Warm with sunny periods. Coastal fog patches in the morning. Moderate easterly winds.

Outlook : Warm tomorrow. It will be cloudier and cooler on Christmas Eve and Christmas Day.


(The above forecast period is valid up to 23:59 HKT today, 21/12/2018; 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 21/Dec/2018

N0 WARNING.

GENERAL SITUATION AT 202100 UTC:
AN EASTERLY AIRSTREAM IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= E 4, NE 4-5 LATER. CLD. DOWN TO 100 M IN FOG PATCHES AT FIRST. SEA UP TO 2 M LATER. TEMP 25-21 C. =
KWANGTUNG= E 4-5, NE 5-6 LATER. CLD. DOWN TO 500 M IN FOG PATCHES AT FIRST. SEA UP TO 2 M, 3 M LATER. =
TAIWAN STRAIT= NE 4-5, OCNL 6. FINE. SEA UP TO 3 M. =
BASHI= E 5-6, OCNL 7. RAIN PATCHES. SEA UP TO 4 M. SWELL E TO NE 2 M. =
PRATAS= E 4-5, OCNL 6. RAIN PATCHES. SEA UP TO 3 M. SWELL E TO NE 2 M. =
BALINTANG= E 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
SCARBOROUGH= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
PARACEL= E TO NE 4-5. CLD. SEA UP TO 2 M. SWELL E TO NE 2 M. =
TONKIN= E TO SE 4, OCNL 5. CLD. DOWN TO 500 M IN FOG PATCHES AT FIRST. SEA UP TO 2 M. =
DANANG= E TO SE 4-5. CLD. SEA UP TO 2 M. SWELL E 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 21/Dec/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 21 December 2018

    Warnings:
    Strong winds in Nan'ao, Shanwei, south of Hong Kong and Shangchuan Dao. Fog in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4, becoming northeast force 4 to 5 later.
    Fog patches at first.
    Moderate seas.

    Nan'ao:
    East force 4 to 5, becoming northeast force 5 to 6.
    Fog patches at first.
    Moderate seas, becoming rough.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    East force 4 to 5, becoming northeast force 5 to 6 later.
    Fog patches at first.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6, becoming northerly winds of force 6 to 7.

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

    Waglan Island Wind northeast force 4
      Visibility 350 Metres

    Shantou Wind northeast force 1
      Visibility 6 Kilometres

    Huangmaozhou Wind east force 4

    Macau Wind east-southeast force 1
      Visibility 4500 Metres in mist

    Xisha Wind east-northeast force 1
      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 09:30 HKT 21/DEC/2018
    (Next update at 12:30 HKT 21/DEC/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     FOG.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE COAST OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/5-10
       OFFSHORE:  090/10-15                            22-27
   B.   2000 FT:  120/15                               18
   C.   5000 FT:  110/10                               13
   D.  10000 FT:  250/25                               11
   E.  18000 FT:  240/35                               MS7
   F.  24000 FT:  260/35                               MS13
   G.  30000 FT:  250/30                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE. SUNNY PERIODS DURING THE DAY.
      LOCALISED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN MIST.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 10400 FT
   M. TURBULENCE    : MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 21 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS.  MAINLY CLOUDY.
     LOCALISED MIST.=

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

    There is no Significant Weather Information (SIGMET)

    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 21/Dec/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     23.2 C
Minimum Air Temperature                     20.1 C
Grass Minimum Temperature                   17.5 C
Relative Humidity                        80 - 89 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2152.3 mm
Against an average of                     2386.4 mm

Other Stations                Min                  Max
King's Park                  19.5 C               24.4 C
Wong Chuk Hang               20.2 C               25.5 C
Ta Kwu Ling                  20.0 C               25.9 C
Lau Fau Shan                 18.7 C               25.8 C
Tai Po                       19.7 C               23.2 C
Sha Tin                      20.1 C               25.2 C
Tuen Mun                     20.4 C               26.2 C
Tseung Kwan O                19.4 C               23.4 C
Sai Kung                     20.1 C               23.5 C
Cheung Chau                  19.1 C               25.6 C
Chek Lap Kok                 20.8 C               27.1 C
Tsing Yi                     19.5 C               26.3 C
Shek Kong                    18.4 C               27.3 C
Tsuen Wan Ho Koon            18.9 C               25.7 C
Tsuen Wan Shing Mun Valley   19.8 C               26.5 C
Hong Kong Park               18.9 C               24.0 C
Shau Kei Wan                 19.7 C               23.4 C
Kowloon City                 19.7 C               26.2 C
Happy Valley                 19.0 C               26.6 C
Wong Tai Sin                 20.0 C               25.4 C
Stanley                      19.9 C               24.1 C
Kwun Tong                    19.3 C               24.3 C
Sham Shui Po                 19.6 C               26.4 C
Kai Tak Runway Park          20.3 C               24.3 C
Yuen Long Park               18.8 C               27.6 C
Tai Mei Tuk               19.8 C               25.2 C

Duration of sunshine (King's Park):              2.0 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.
 

Yesterday's (20 Dec 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
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                         0.14
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 in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 20 Dec
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Dec 2018> 

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