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Bulletin issued at 18:02 HKT 08/Jan/2018

At 6 p.m. at the Hong Kong Observatory the air temperature was 13 degrees Celsius and the relative humidity 89 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.0. The intensity of UV radiation was low.

Please be reminded that:

The Strong Monsoon Signal has been issued.
The Cold Weather Warning is now in force. Cold weather might cause adverse health effects. Members of the public should take care to keep warm.

The air temperatures at other places were:

King's Park 12 degrees;
Wong Chuk Hang 13 degrees;
Ta Kwu Ling 10 degrees;
Lau Fau Shan 11 degrees;
Tai Po 11 degrees;
Sha Tin 11 degrees;
Tuen Mun 12 degrees;
Tseung Kwan O 12 degrees;
Sai Kung 11 degrees;
Cheung Chau 12 degrees;
Chek Lap Kok 12 degrees;
Tsing Yi 12 degrees;
Shek Kong 10 degrees;
Tsuen Wan Ho Koon 10 degrees;
Tsuen Wan Shing Mun Valley 12 degrees;
Hong Kong Park 13 degrees;
Shau Kei Wan 12 degrees;
Kowloon City 11 degrees;
Happy Valley 13 degrees;
Wong Tai Sin 12 degrees;
Stanley 13 degrees;
Kwun Tong 11 degrees;
Sham Shui Po 12 degrees;
Kai Tak Runway Park 13 degrees;
Yuen Long Park 11 degrees;
Tai Mei Tuk 11 degrees.

Between 4:45 and 5:45 p.m., the rainfall recorded in various regions were:

Tuen Mun 0 to 1 mm;
Sham Shui Po 0 to 1 mm.


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


Climatological Information for 8 Jan

Regional Weather in Hong Kong

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Bulletin updated at 17:45 HKT 08/Jan/2018

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

The intense winter monsoon associated with a cold front is affecting Guangdong. Locally, temperatures over the territory in the afternoon were generally four to seven degrees lower than those of yesterday.

Weather forecast for tonight and tomorrow

It will be cold and temperatures dropping further tomorrow. Temperatures will range between 8 and 10 degrees in the urban areas, and a couple of degrees lower in the New Territories. Cloudy to overcast with a few rain patches. Fresh northerly winds, strong offshore and on high ground at first.

Outlook : The cold weather will persist for a few days. Weather will start to improve on Wednesday.


(The above forecast period is valid up to 23:59 HKT tomorrow, 09/01/2018; 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 08/Jan/2018

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH, PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 072100 UTC:
COLD FRONT 23N 110E 24N 115E 29N 125E S 15KT. AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS GRADUALLY.

MARINE FORECAST FOR 24 HOURS FROM 080100 UTC:

HONG KONG= N 7-8, SE 3-4 AT FIRST. RAIN PATCHES. DOWN TO 500 M IN FOG AT FIRST. SEA 4-6 M. SWELL NE 2 M. TEMP 19-8 C. =
KWANGTUNG= N 7-8, SE 4-5 AT FIRST. RAIN PATCHES. DOWN TO 500 M IN FOG PATCHES AT FIRST. SEA 4-6 M, 2 M AT FIRST. SWELL NE 2 M. =
TAIWAN STRAIT= N 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2 M. =
BASHI= SE 5, BEC N 7-8. RAIN PATCHES. DOWN TO 2000 M IN MIST PATCHES AT FIRST. SEA 2 M, BEC 4-6 M. SWELL NE 2 M. =
PRATAS= SE 4-5, BEC N 7-8. RAIN PATCHES. SEA 2 M, BEC 4-6 M. SWELL NE 2 M. =
BALINTANG= SE 5, BEC N 7-8. RAIN PATCHES. DOWN TO 2000 M IN MIST PATCHES AT FIRST. SEA 2 M, BEC 4-6 M. SWELL NE 2 M. =
SCARBOROUGH= SE 4-5, BEC N 7-8. RAIN PATCHES. SEA 2 M, BEC 4-6 M. SWELL NE 2 M. =
PARACEL= SE 4-5, BEC N 7-8. RAIN PATCHES. DOWN TO 2000 M IN MIST PATCHES AT FIRST. SEA 2 M, BEC 4-6 M. SWELL NE 2 M. =
TONKIN= N 7-8, SE 5 AT FIRST. RAIN PATCHES. DOWN TO 500 M IN FOG PATCHES AT FIRST. SEA 4-6 M, 2 M AT FIRST. SWELL NE 2 M. =
DANANG= SE 4-5, BEC N 7-8. RAIN PATCHES. DOWN TO 2000 M IN MIST PATCHES AT FIRST. SEA 2 M, BEC 4-6 M. SWELL 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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    Bulletin issued at 16:30 HKT 08/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 08 January 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    The intense winter monsoon associated with a cold front is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7, occasionally force 8.
    A few rain patches.
    Rough to very rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    North force 7 to 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, occasionally force 8.

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

    Waglan Island Wind north force 6
      Visibility 48 Kilometres

    Shantou Wind southeast force 2
      Visibility 12 Kilometres in rain

    Dongsha Wind west-southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northwest force 8

    Macau Wind north force 4
      Visibility 10 Kilometres in rain

    Xisha Wind south-southwest force 1
      Visibility 20 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 08/JAN/2018
    (Next update at 01:30 HKT 09/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.  GALE FORCE WINDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE INTENSE WINTER MONSOON ASSOCIATED WITH A
     COLD FRONT IS AFFECTING GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15-20
       OFFSHORE:  360/20-25                            12-8
   B.   2000 FT:  010/30-35                            10
   C.   5000 FT:  290/35                               12
   D.  10000 FT:  250/40                               9
   E.  18000 FT:  250/50                               MS7
   F.  24000 FT:  260/50                               MS15
   G.  30000 FT:  260/65                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      300-1300 FT
   I. WEATHER       : 
      CLOUDY WITH A FEW RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 9400 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 17 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG NORTHERLY 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=

    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 08/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     17.6 C
Minimum Air Temperature                     15.7 C
Grass Minimum Temperature                   15.6 C
Relative Humidity                        89 - 98 Percent
Rainfall                                    16.2 mm 
Total rainfall since 1st January            20.3 mm
Against an average of                        5.8 mm

Other Stations                Min                  Max
King's Park                  15.4 C               17.8 C
Wong Chuk Hang               16.1 C               18.9 C
Ta Kwu Ling                  14.1 C               19.0 C
Lau Fau Shan                 14.3 C               19.9 C
Tai Po                       15.0 C               18.3 C
Sha Tin                      15.3 C               18.4 C
Tuen Mun                     14.8 C               19.4 C
Tseung Kwan O                15.2 C               17.1 C
Sai Kung                     15.5 C               17.7 C
Cheung Chau                  15.3 C               17.5 C
Chek Lap Kok                 15.4 C               19.6 C
Tsing Yi                     15.8 C               19.2 C
Shek Kong                    14.8 C               20.3 C
Tsuen Wan Ho Koon            14.9 C               18.4 C
Tsuen Wan Shing Mun Valley   15.6 C               19.2 C
Hong Kong Park               15.5 C               17.8 C
Shau Kei Wan                 15.0 C               17.1 C
Kowloon City                 15.4 C               18.0 C
Happy Valley                 16.0 C               18.2 C
Stanley                      15.4 C               17.3 C
Kwun Tong                    15.4 C               17.4 C
Sham Shui Po                 15.8 C               19.5 C
Kai Tak Runway Park          16.2 C               18.0 C
Yuen Long Park               14.3 C               20.6 C
Tai Mei Tuk               14.8 C               17.8 C

Duration of sunshine (King's Park):              0 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 3.
Sea surface temperature (Waglan Island):        17.7 C 

Yesterday's (07 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                         0.11
Kwun Tong                           0.12
Sai Wan Ho                          0.10
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 07 Jan
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