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Bulletin issued at 19:02 HKT 05/Jan/2018

At 7 p.m. at the Hong Kong Observatory the air temperature was 19 degrees Celsius and the relative humidity 92 per cent.

A broad band of clouds will bring occasional rain to the territory on Saturday (6 January) and the following few days. A cold front will reach the south China coast on Monday. Under the influence of the intense winter monsoon behind the cold front, the temperature in Hong Kong will fall significantly during the day on Monday and will become cold at night. Temperatures in urban areas will drop below 10 degrees on Tuesday and it will be a few degrees lower in the New Territories. It will also be windy with rain. The cold weather is expected to persist for several days. Weather will improve on Wednesday.

The air temperatures at other places were:

King's Park 18 degrees;
Wong Chuk Hang 18 degrees;
Ta Kwu Ling 17 degrees;
Lau Fau Shan 18 degrees;
Tai Po 17 degrees;
Sha Tin 18 degrees;
Tuen Mun 19 degrees;
Tseung Kwan O 18 degrees;
Sai Kung 18 degrees;
Cheung Chau 17 degrees;
Chek Lap Kok 19 degrees;
Tsing Yi 18 degrees;
Shek Kong 19 degrees;
Tsuen Wan Ho Koon 18 degrees;
Tsuen Wan Shing Mun Valley 18 degrees;
Hong Kong Park 18 degrees;
Shau Kei Wan 17 degrees;
Kowloon City 18 degrees;
Happy Valley 18 degrees;
Wong Tai Sin 18 degrees;
Stanley 17 degrees;
Kwun Tong 17 degrees;
Sham Shui Po 18 degrees;
Kai Tak Runway Park 18 degrees;
Yuen Long Park 18 degrees;
Tai Mei Tuk 17 degrees.

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

Central & Western District 0 to 1 mm.


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


Climatological Information for 5 Jan

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 18:45 HKT 05/Jan/2018

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

A broad band of clouds is covering the coast of Guangdong. Meanwhile, a rainband is affecting the northern part of the South China Sea.

Weather forecast for tonight and tomorrow

Cloudy. Visibility relatively low in some areas. There will be a few rain patches, with more rain later tomorrow. Temperatures will range between 17 and 19 degrees. Fresh easterly winds, occasionally strong offshore tomorrow.

Outlook : Rainy on Sunday. Temperatures dropping appreciably on Monday and becoming cold at night. The cold weather will persist until the latter part of next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 06/01/2018; 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 05/Jan/2018

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 042100 UTC:
COLD FRONT 24N 109E 24N 116E 27N 120E 28N 125E S 6KT

MARINE FORECAST FOR 24 HOURS FROM 050100 UTC:

HONG KONG= E TO NE 5-6, UP TO 7 LATER. RAIN PATCHES. SEA 2-3 M, UP TO 4 M LATER. TEMP 21-16 C. =
KWANGTUNG= E TO NE 5-6, UP TO 7 LATER. RAIN PATCHES. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO NE UP TO 2 M. =
TAIWAN STRAIT= NE 6-7, BEC 8. RAIN PATCHES. SEA 3-4 M, BEC 6 M. SWELL NE UP TO 2 M. =
BASHI= E 5-6, UP TO 7 LATER. RAIN PATCHES. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO NE 2 M. =
PRATAS= E 5-6, UP TO 7 LATER. RAIN PATCHES. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO NE 2 M. =
BALINTANG= E 5-6, UP TO 7 LATER. RAIN PATCHES. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO NE 2 M. =
SCARBOROUGH= E TO NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
PARACEL= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
TONKIN= E 5. RAIN PATCHES. SEA 2 M. =
DANANG= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 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.


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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 05/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 05 January 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters. Meanwhile, a rainband is affecting the region.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 5 to 6, occasionally force 7.
    Visibility relatively low in some areas. A few rain patches. More rain later tomorrow.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East force 6 to 7.
    Rough seas.

    Shangchuan Dao:
    East force 5 to 6.
    Moderate to rough seas.

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

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

    Waglan Island Wind northeast force 4
      Visibility 5000 Metres

    Shantou Wind northeast force 2
      Visibility 9 Kilometres

    Dongsha Wind east-northeast force 4
      Visibility 9 Kilometres in rain

    Huangmaozhou Wind northeast force 4

    Macau Wind north-northeast force 2
      Visibility 4500 Metres in mist

    Xisha Wind east force 2
      Visibility 14 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 05/JAN/2018
    (Next update at 01:30 HKT 06/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.  MEANWHILE, A RAINBAND IS
     AFFECTING THE REGION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
       OFFSHORE:  080/20-25                            19-17
   B.   2000 FT:  100/20-25                            14
   C.   5000 FT:  170/15                               14
   D.  10000 FT:  250/25                               8
   E.  18000 FT:  250/40                               MS7
   F.  24000 FT:  250/50                               MS16
   G.  30000 FT:  250/60                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH A FEW RAIN PATCHES.  LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 6000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN RAIN/MIST.
   L. 0 DEG. C LEVEL: 15000 FT
      10 DEG. C LEVEL(S) : 7000, 9400 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 19 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EASTERLY WINDS.  CLOUDY WITH
     RAIN PATCHES.  LOCALIZED 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.

    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 15:30 HKT 04/Jan/2018


    Tropical Cyclone Warning

    At 040600 UTC, Tropical Depression Bolaven (1801) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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 05/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     20.5 C
Minimum Air Temperature                     18.1 C
Grass Minimum Temperature                   16.3 C
Relative Humidity                        74 - 88 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January             0.2 mm
Against an average of                        1.8 mm

Other Stations                Min                  Max
King's Park                  17.6 C               21.5 C
Wong Chuk Hang               18.6 C               21.4 C
Ta Kwu Ling                  17.0 C               22.9 C
Lau Fau Shan                 16.8 C               24.9 C
Tai Po                       18.1 C               20.1 C
Sha Tin                      18.2 C               21.1 C
Tuen Mun                     17.5 C               22.6 C
Tseung Kwan O                17.2 C               19.6 C
Sai Kung                     17.6 C               19.6 C
Cheung Chau                  17.8 C               21.2 C
Chek Lap Kok                 19.1 C               23.1 C
Tsing Yi                     18.8 C               22.3 C
Shek Kong                    18.4 C               23.0 C
Tsuen Wan Ho Koon            17.1 C               22.1 C
Tsuen Wan Shing Mun Valley   18.9 C               23.2 C
Hong Kong Park               17.8 C               20.5 C
Shau Kei Wan                 16.9 C               19.1 C
Kowloon City                 17.9 C               22.9 C
Happy Valley                 18.3 C               21.2 C
Wong Tai Sin                 18.0 C               21.4 C
Stanley                      17.1 C               19.9 C
Kwun Tong                    17.0 C               19.9 C
Sham Shui Po                 19.0 C               23.4 C
Kai Tak Runway Park          18.0 C               20.0 C
Yuen Long Park               17.9 C               23.6 C
Tai Mei Tuk               17.6 C               20.6 C

Duration of sunshine (King's Park):              0.6 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):        17.7 C 

Yesterday's (04 Jan 2018) 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 04 Jan
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