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Bulletin issued at 05:02 HKT 06/Jan/2018

At 5 a.m. at the Hong Kong Observatory the air temperature was 17 degrees Celsius and the relative humidity 93 per cent.

Please be reminded that:

The Strong Monsoon Signal has been issued.

The air temperatures at other places were:

King's Park 16 degrees;
Wong Chuk Hang 16 degrees;
Ta Kwu Ling 16 degrees;
Lau Fau Shan 16 degrees;
Tai Po 17 degrees;
Sha Tin 16 degrees;
Tuen Mun 17 degrees;
Tseung Kwan O 16 degrees;
Sai Kung 16 degrees;
Cheung Chau 16 degrees;
Chek Lap Kok 17 degrees;
Tsing Yi 17 degrees;
Shek Kong 18 degrees;
Tsuen Wan Ho Koon 16 degrees;
Tsuen Wan Shing Mun Valley 17 degrees;
Hong Kong Park 16 degrees;
Shau Kei Wan 15 degrees;
Kowloon City 16 degrees;
Happy Valley 16 degrees;
Wong Tai Sin 16 degrees;
Stanley 15 degrees;
Kwun Tong 15 degrees;
Sham Shui Po 17 degrees;
Kai Tak Runway Park 16 degrees;
Yuen Long Park 16 degrees;
Tai Mei Tuk 16 degrees.

Between 3:45 and 4:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 1 mm;
Sai Kung 0 to 1 mm;
Southern District 0 to 1 mm.


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


Climatological Information for 6 Jan

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:45 HKT 06/Jan/2018

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

A strong easterly airstream is affecting the coast of Guangdong. Meanwhile, a broad band of clouds is covering the region and the northern part of the South China Sea.

Weather forecast for today

Cloudy. Visibility rather low in some areas. There will be a few rain patches, with more rain later. The maximum temperature will be about 19 degrees. Fresh easterly winds, strong offshore.

Outlook : Rainy tomorrow. 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 today, 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 21:00 HKT 05/Jan/2018

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 050900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 051300 UTC:

HONG KONG= E 5-6, OCNL 7. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA UP TO 4 M. TEMP 16-19 C. =
KWANGTUNG= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E 2 M. =
TAIWAN STRAIT= NE 7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2 M. =
BASHI= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E 2 M. =
PRATAS= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E 2 M. =
BALINTANG= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E 2 M. =
SCARBOROUGH= E 5-6. RAIN PATCHES. SEA 2-3 M. SWELL E TO NE 2 M. =
PARACEL= E 5-6. RAIN PATCHES. SEA 2-3 M. SWELL E TO NE 2 M. =
TONKIN= E 5. RAIN PATCHES. SEA 2 M. =
DANANG= E 5-6. RAIN PATCHES. SEA 2-3 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.


  • 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 05:30 HKT 06/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 06 January 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A strong 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 rather low in some areas. A few rain patches. More rain later.
    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 east-northeast force 6
      Visibility 13 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

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

    Huangmaozhou Wind east force 7

    Macau Wind north-northeast force 2
      Visibility 600 Metres in rain

    Xisha Wind east force 1
      Visibility 12 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 01:30 HKT 06/JAN/2018
    (Next update at 9:00-9:30 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 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
       OFFSHORE:  080/20-25                            17-20
   B.   2000 FT:  100/20-25                            13
   C.   5000 FT:  170/20                               15
   D.  10000 FT:  250/25                               8
   E.  18000 FT:  250/40                               MS7
   F.  24000 FT:  250/50                               MS17
   G.  30000 FT:  250/60                               MS32
   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) : 9000 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.

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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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    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 06/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     22.8 C
Minimum Air Temperature                     17.2 C
Grass Minimum Temperature                   17.0 C
Relative Humidity                        77 - 92 Percent
Rainfall                                     0.2 mm 
Total rainfall since 1st January             0.4 mm
Against an average of                        4.0 mm

Other Stations                Min                  Max
King's Park                  16.6 C               23.2 C
Wong Chuk Hang               17.0 C               23.1 C
Ta Kwu Ling                  15.3 C               23.5 C
Lau Fau Shan                 16.1 C               22.9 C
Tai Po                       16.8 C               21.3 C
Sha Tin                      17.0 C               23.4 C
Tuen Mun                     17.5 C               22.6 C
Tseung Kwan O                16.4 C               22.7 C
Sai Kung                     16.7 C               21.2 C
Cheung Chau                  16.3 C               21.6 C
Chek Lap Kok                 17.6 C               23.0 C
Tsing Yi                     17.8 C               23.4 C
Shek Kong                    17.4 C               23.7 C
Tsuen Wan Ho Koon            16.3 C               22.8 C
Tsuen Wan Shing Mun Valley   17.2 C               23.5 C
Hong Kong Park               16.8 C               22.6 C
Shau Kei Wan                 16.0 C               21.7 C
Kowloon City                 16.5 C               23.9 C
Happy Valley                 17.0 C               23.1 C
Wong Tai Sin                 16.6 C               23.4 C
Stanley                      16.2 C               20.6 C
Kwun Tong                    16.1 C               22.7 C
Sham Shui Po                 17.4 C               24.5 C
Kai Tak Runway Park          17.0 C               21.7 C
Yuen Long Park               16.8 C               23.7 C
Tai Mei Tuk               16.5 C               23.2 C

Duration of sunshine (King's Park):              0.2 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 4.
Sea surface temperature (Waglan Island):        17.8 C 

Yesterday's (05 Jan 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.11
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 05 Jan
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