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Bulletin issued at 07:02 HKT 04/Jan/2018

At 7 a.m. at the Hong Kong Observatory the air temperature was 19 degrees Celsius and the relative humidity 83 per cent.

The air temperatures at other places were:

King's Park 19 degrees;
Wong Chuk Hang 19 degrees;
Ta Kwu Ling 18 degrees;
Lau Fau Shan 18 degrees;
Tai Po 18 degrees;
Sha Tin 19 degrees;
Tuen Mun 19 degrees;
Tseung Kwan O 18 degrees;
Sai Kung 19 degrees;
Cheung Chau 19 degrees;
Chek Lap Kok 20 degrees;
Tsing Yi 20 degrees;
Shek Kong 20 degrees;
Tsuen Wan Ho Koon 18 degrees;
Tsuen Wan Shing Mun Valley 20 degrees;
Hong Kong Park 18 degrees;
Shau Kei Wan 18 degrees;
Kowloon City 19 degrees;
Happy Valley 19 degrees;
Wong Tai Sin 19 degrees;
Stanley 18 degrees;
Kwun Tong 18 degrees;
Sham Shui Po 19 degrees;
Kai Tak Runway Park 19 degrees;
Yuen Long Park 19 degrees;
Tai Mei Tuk 18 degrees.

Here is the information on Tropical Depression Bolaven at 5 a.m.:
Location: 11.5 degrees north, 111.6 degrees east.


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


Climatological Information for 4 Jan

Regional Weather in Hong Kong

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Hong Kong Climatology


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

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

An easterly airstream is affecting the coast of Guangdong.

Tropical Storm Bolaven has weakened into a tropical depression. At 5 a.m., Bolaven was centred about 540 kilometres east of Ho Chi Minh City. It is forecast to move west at about 22 kilometres per hour towards the vicinity of the southern part of Vietnam and continue to weaken.

Weather forecast for today

Mainly cloudy with one or two light rain patches. The maximum temperature will be about 21 degrees. Moderate to fresh easterly winds.

Outlook : Cloudy with rain in the next couple of days. The weather will become cold early next week.


(The above forecast period is valid up to 23:59 HKT today, 04/01/2018; 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 03/Jan/2018

GALE WARNING AREAS: BASHI AND BALINTANG.

GENERAL SITUATION AT 030900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL STORM BOLAVEN (1801), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 031300 UTC:

HONG KONG= E 5-6. LGT RAIN PATCHES. SEA 2-3 M. SWELL E UP TO 2 M. TEMP 18-21 C. =
KWANGTUNG= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E TO NE 2-3 M. =
TAIWAN STRAIT= NE 5-6, OCNL 7. RAIN PATCHES. SEA UP TO 4 M. SWELL NE 2 M. =
BASHI= E 7-8, 6-7 LATER. RAIN PATCHES. SEA 4-6 M, 3-4 M LATER. SWELL E TO NE 3-4 M. =
PRATAS= E 6-7. RAIN PATCHES. SEA 3-4 M. SWELL E TO NE 2-3 M. =
BALINTANG= E 7-8, 6-7 LATER. RAIN PATCHES. SEA 4-6 M, 3-4 M LATER. SWELL E TO NE 3-4 M. =
SCARBOROUGH= E TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 2-3 M. =
PARACEL= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2-3 M. =
TONKIN= E 5, OCNL 6. RAIN PATCHES. SEA UP TO 3 M. SWELL E UP TO 2 M. =
DANANG= E TO NE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 6:45 a.m. on 04 January 2018

    Warnings:
    Strong winds in all areas.

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

    Tropical Storm Bolaven has weakened into a Tropical Depression. At 5 a.m., Bolaven with maximum sustained winds of about 55 kilometres per hour near its centre was located at 11.5 degrees north, 111.6 degrees east, it is forecast to move west at about 22 kilometres per hour towards the vicinity of the southern part of Vietnam and continue to weaken.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 5 to 6.
    A few light rain patches.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6, force 7 later. Scattered squally showers and thunderstorms later.

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

    Waglan Island Wind east-northeast force 6
      Visibility 13 Kilometres

    Shantou Wind northeast force 1
      Visibility 13 Kilometres

    Dongsha Wind east-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 6

    Macau Wind east force 3
      Visibility 13 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 6 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 06:15 HKT 04/JAN/2018
    (Next update at 9:00-9:30 HKT 04/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.
     TROPICAL STORM BOLAVEN HAS WEAKENED INTO A
     TROPICAL DEPRESSION. 
     AT 5 A.M., BOLAVEN WAS LOCATED AT 11.5 DEGREES
     NORTH, 111.6 DEGREES EAST, IT IS FORECAST TO
     MOVE WEST AT ABOUT 14 KNOTS TOWARDS THE VICINITY
     OF THE SOUTHERN PART OF VIETNAM AND CONTINUE TO
     WEAKEN.
     
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0615 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15
       OFFSHORE:  080/15-20, OCNL 25                   18-23
   B.   2000 FT:  100/20-25, OCNL 30                   16
   C.   5000 FT:  110/20, OCNL 25                      13
   D.  10000 FT:  200/20-25                            10
   E.  18000 FT:  230/30-35                            MS4
   F.  24000 FT:  220/40                               MS16
   G.  30000 FT:  240/45                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1700-1900 FT.
   I. WEATHER       : 
      CLOUDY PERIODS WITH A FEW RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 6400, 10000, 12000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 18 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS.  CLOUDY WITH A
     FEW RAIN PATCHES.=

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

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    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 06:30 HKT 04/Jan/2018


    Tropical Cyclone Warning

    Tropical Storm Bolaven (1801) has weakened into a Tropical Depression with central pressure 1002 hectopascals. At 032100 UTC, it was centred within 90 nautical miles of one one point five degrees north (11.5 N) one one one point five degrees east (111.5 E) and is forecast to move west at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 042100 UTC
    Dissipated over land.



    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 04/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     22.0 C
Minimum Air Temperature                     18.2 C
Grass Minimum Temperature                   15.9 C
Relative Humidity                        65 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January               0 mm
Against an average of                        1.4 mm

Other Stations                Min                  Max
King's Park                  17.9 C               22.8 C
Wong Chuk Hang               18.8 C               22.9 C
Ta Kwu Ling                  16.7 C               24.9 C
Lau Fau Shan                 16.1 C               26.5 C
Tai Po                       17.6 C               22.2 C
Sha Tin                      17.7 C               24.5 C
Tuen Mun                     16.4 C               25.4 C
Tseung Kwan O                17.5 C               23.0 C
Sai Kung                     17.7 C               21.3 C
Cheung Chau                  18.0 C               23.1 C
Chek Lap Kok                 18.7 C               25.4 C
Tsing Yi                     18.2 C               24.3 C
Shek Kong                    17.9 C               25.2 C
Tsuen Wan Ho Koon            16.2 C               24.5 C
Tsuen Wan Shing Mun Valley   18.2 C               24.9 C
Hong Kong Park               18.2 C               23.0 C
Shau Kei Wan                 17.6 C               21.0 C
Kowloon City                 18.0 C               23.8 C
Happy Valley                 18.4 C               23.3 C
Wong Tai Sin                 18.1 C               23.2 C
Stanley                      17.9 C               20.6 C
Kwun Tong                    17.9 C               21.4 C
Sham Shui Po                 18.5 C               25.5 C
Kai Tak Runway Park          18.8 C               21.6 C
Yuen Long Park               15.5 C               25.8 C
Tai Mei Tuk               17.3 C               24.3 C

Duration of sunshine (King's Park):              8.4 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 6.
Sea surface temperature (Waglan Island):        17.9 C 

Yesterday's (03 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 03 Jan
     2003copy right image | Important notices | Privacy policy Last revision date: <04 Jan 2018> 

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