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Bulletin issued at 19:02 HKT 12/Jan/2018

At 7 p.m. at the Hong Kong Observatory the air temperature was 13 degrees Celsius and the relative humidity 57 per cent.

Please be reminded that:

The Fire Danger Warning is Red and the fire risk is extreme.
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 13 degrees;
Wong Chuk Hang 12 degrees;
Ta Kwu Ling 10 degrees;
Lau Fau Shan 12 degrees;
Tai Po 12 degrees;
Sha Tin 12 degrees;
Tuen Mun 12 degrees;
Tseung Kwan O 9 degrees;
Sai Kung 12 degrees;
Cheung Chau 13 degrees;
Chek Lap Kok 14 degrees;
Tsing Yi 14 degrees;
Shek Kong 11 degrees;
Tsuen Wan Ho Koon 10 degrees;
Tsuen Wan Shing Mun Valley 12 degrees;
Hong Kong Park 12 degrees;
Shau Kei Wan 12 degrees;
Kowloon City 12 degrees;
Happy Valley 11 degrees;
Wong Tai Sin 13 degrees;
Stanley 13 degrees;
Kwun Tong 12 degrees;
Sham Shui Po 13 degrees;
Kai Tak Runway Park 14 degrees;
Yuen Long Park 12 degrees;
Tai Mei Tuk 11 degrees.


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


Climatological Information for 12 Jan

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 18:45 HKT 12/Jan/2018

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

A dry winter monsoon is affecting southern China. Locally, the relative humidity over the territory stayed below 40 per cent.

Weather forecast for tonight and tomorrow

Fine and dry. Cold tomorrow morning with a minimum temperature of around 12 degrees in the urban areas, and a few degrees lower in the New Territories. The maximum temperature will be about 15 degrees during the day. Moderate to fresh east to northeasterly winds, occasionally strong offshore tomorrow.

Outlook : Mainly fine in the following few days. Rather cool on Sunday morning. Temperatures will rise gradually next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/01/2018; 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 12/Jan/2018

GALE WARNING AREAS: TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH, PARACEL AND DANANG.

GENERAL SITUATION AT 112100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= N TO NE 5-6. FINE. SEA 2-3 M. SWELL NE UP TO 2 M. TEMP 15-12 C. =
KWANGTUNG= NE 6-7. FINE. SEA 3-4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. FINE. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 M. =
PRATAS= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 M. =
BALINTANG= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 M. =
SCARBOROUGH= NE 7-8. FINE. SEA 4-6 M. SWELL NE 3 M. =
PARACEL= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
TONKIN= NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
DANANG= NE 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL 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.


  • Map showing the 10 forecast areas
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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 12/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 12 January 2018

    Warnings:
    Gale force winds in Nan'ao. Strong winds in Hong Kong adjacent waters, Shanwei, south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 6 to 7.
    Rough seas.

    Nan'ao:
    East to northeast force 7 to 8.
    Rough to very rough seas.

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

    Outlook for the next 48 hours
    Easterly winds of force 5 to 6.

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

    Waglan Island Wind east-northeast force 3
      Visibility 23 Kilometres

    Shantou Wind east-northeast force 3
      Visibility 26 Kilometres

    Dongsha Wind northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 6

    Macau Wind north force 3
      Visibility 22 Kilometres

    Xisha Wind northeast force 4
      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 17:30 HKT 12/JAN/2018
    (Next update at 01:30 HKT 13/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  070/10-15
       OFFSHORE:  070/15-20 OCNL 25                    15-12
   B.   2000 FT:  080/15-20 OCNL 25                    6
   C.   5000 FT:  080/15                               6
   D.  10000 FT:  290/10                               MS2
   E.  18000 FT:  270/45                               MS6
   F.  24000 FT:  310/55                               MS18
   G.  30000 FT:  310/75                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3200-5000 FT
   I. WEATHER       : 
      FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10000 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 8500 FT       10 DEG. C LEVEL(S) : 1500 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-3.5 M     SEA TEMPERATURE    : 17 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY
     WINDS,OCCASIONALLY STRONG OFFSHORE. FINE.=

    ===================================================================
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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    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 12/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     16.1 C
Minimum Air Temperature                     12.1 C
Grass Minimum Temperature                   10.0 C
Relative Humidity                        33 - 48 Percent
Rainfall                                      Trace 
Total rainfall since 1st January            41.8 mm
Against an average of                        7.5 mm

Other Stations                Min                  Max
King's Park                  11.7 C               16.8 C
Wong Chuk Hang               12.6 C               19.2 C
Ta Kwu Ling                   9.6 C               17.2 C
Lau Fau Shan                 10.1 C               17.9 C
Tai Po                       10.2 C               16.5 C
Sha Tin                      12.2 C               17.3 C
Tuen Mun                     11.5 C               17.7 C
Sai Kung                     11.6 C               16.2 C
Cheung Chau                  10.9 C               16.5 C
Chek Lap Kok                 12.4 C               17.7 C
Tsing Yi                     11.7 C               17.9 C
Shek Kong                    11.1 C               18.1 C
Tsuen Wan Ho Koon             9.2 C               16.4 C
Tsuen Wan Shing Mun Valley   11.4 C               18.0 C
Hong Kong Park               12.1 C               18.0 C
Shau Kei Wan                 11.6 C               17.6 C
Kowloon City                 11.4 C               17.2 C
Happy Valley                 12.7 C               18.7 C
Wong Tai Sin                 11.7 C               18.1 C
Stanley                      12.2 C               17.3 C
Kwun Tong                    11.4 C               17.2 C
Sham Shui Po                 12.2 C               18.8 C
Kai Tak Runway Park          12.6 C               17.5 C
Yuen Long Park               10.7 C               18.2 C
Tai Mei Tuk               11.2 C               16.3 C

Duration of sunshine (King's Park):              9.3 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):        16.7 C 

Yesterday's (11 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                         0.14
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 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 11 Jan
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