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Bulletin issued at 00:02 HKT 31/Dec/2018

At midnight at the Hong Kong Observatory the air temperature was 12 degrees Celsius and the relative humidity 67 per cent.

Please be reminded that:

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


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


Climatological Information for 31 Dec

Regional Weather in Hong Kong

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Bulletin updated at 00:00 HKT 31/Dec/2018

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

The winter monsoon brought cold weather to Guangdong yesterday. Locally, it was mainly cloudy. The weather was cold in the morning. The minimum temperature recorded at the Observatory was 10.3 degrees, the lowest so far this winter. There were sunny periods during the day and one or two light rain patches at night. Under the influence of an intense winter monsoon, cold weather will persist over Guangdong in the next couple of days. It will also be windier with a few rain patches.

Besides, the tropical depression over the central part of the Philippines weakened into an area of low pressure yesterday morning.

Weather forecast for Hong Kong (Monday, 31 Dec 2018)

Mainly cloudy. One or two light rain patches in the morning. It will be cold. The minimum temperature will be about 10 degrees in the urban areas, and a couple of degrees lower in the New Territories. Bright periods during the day tomorrow. The maximum temperature will be around 15 degrees. Moderate to fresh northerly winds, occasionally strong offshore.

Outlook : Cold weather will persist and it will be windier with a few rain patches on New Year's Day and the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 31/12/2018; 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 30/Dec/2018

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

GENERAL SITUATION AT 300900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 301300 UTC:

HONG KONG= N TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. TEMP 11-15 C. =
KWANGTUNG= N TO NE 7-8, OCNL 9 IN E. LGT RAIN PATCHES. SEA 4-6 M, UP TO 8 M IN E. SWELL NE 3-5 M. =
TAIWAN STRAIT= N TO NE 8-9, OCNL 10. LGT RAIN PATCHES. SEA UP TO 10 M. SWELL N TO NE 5 M. =
BASHI= N TO NE 8-9, OCNL 10. ISOL SHOWERS. SEA UP TO 10 M. SWELL N TO NE 5 M. =
PRATAS= N TO NE 8, OCNL 9. RAIN PATCHES. SEA UP TO 8 M. SWELL NE 5 M. =
BALINTANG= N TO NE 8-9, OCNL 10. ISOL SHOWERS. SEA UP TO 10 M. SWELL N TO NE 5 M. =
SCARBOROUGH= N TO NE 8-9, OCNL 10. ISOL SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 5 M. =
PARACEL= N TO NE 7-8, OCNL 9. ISOL SHOWERS. SEA UP TO 8 M. SWELL NE 3-5 M. =
TONKIN= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
DANANG= N TO NE 7-8, OCNL 9. ISOL SHOWERS. SEA UP TO 8 M. SWELL NE 3-5 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 23:30 HKT 30/Dec/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 30 December 2018

    Warnings:
    Gale force winds in all areas.

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

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 7 to 8.
    A few light rain patches.
    Rough to very rough seas.

    Nan'ao:
    North to northeast force 8, occasionally force 9.
    Very rough to high seas.

    Shanwei:
    North to northeast force 8.
    Very rough seas.

    South of Hong Kong and Shangchuan Dao:
    North to northeast force 7 to 8.
    Rough to very rough seas.

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

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

    Waglan Island Wind north force 5

    Shantou Wind south force 1
      Visibility 26 Kilometres

    Huangmaozhou Wind north-northeast force 5

    Xisha Wind east-northeast force 3
      Visibility 15 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 30/DEC/2018
    (Next update at 01:30 HKT 31/DEC/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE 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:  020/15, OCNL 20
       OFFSHORE:  020/20-25                            12-9
   B.   2000 FT:  060/20-25                            8
   C.   5000 FT:  150/10                               7
   D.  10000 FT:  270/20                               7
   E.  18000 FT:  260/40                               MS9
   F.  24000 FT:  240/50                               MS16
   G.  30000 FT:  250/55                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2500-4400 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW LIGHT RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3000 FT  BKN 6000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : NEAR SURFACE,7000,7600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 21 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, OCCASIONALLY FRESH TO
     STRONG OFFSHORE AND ON HIGH GROUND. MAINLY
     CLOUDY WITH ONE OR TWO LIGHT 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.

    There is no Significant Weather Information (SIGMET)

    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 06:30 HKT 30/Dec/2018


    Tropical Cyclone Warning

    At 292100 UTC, the tropical depression over the Philippines with central pressure 1002 hectopascals was centred within 90 nautical miles of nine point four degrees north (9.4 N) one one nine point two degrees east (119.2 E) and is forecast to move west-southwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    No further warnings on this Tropical Depression will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 302100 UTC
    Seven point six degrees north (7.6 N)
    One one three point zero degrees east (113.0 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 312100 UTC
    Six point one degrees north (6.1 N)
    One one zero point one degrees east (110.1 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 012100 UTC
    Six point zero degrees north (6.0 N)
    One zero seven point six degrees east (107.6 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 022100 UTC
    Six point six degrees north (6.6 N)
    One zero four point four degrees east (104.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 032100 UTC
    Eight point four degrees north (8.4 N)
    One zero zero point five degrees east (100.5 E)
    Maximum winds 35 knots.



    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 31/Dec/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     15.4 C
Minimum Air Temperature                     10.3 C
Grass Minimum Temperature                   12.2 C
Relative Humidity                        61 - 73 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2162.9 mm
Against an average of                     2396.8 mm

Other Stations                Min                  Max
King's Park                   9.2 C               15.2 C
Wong Chuk Hang               10.2 C               17.5 C
Ta Kwu Ling                   7.7 C               13.3 C
Lau Fau Shan                  8.5 C               13.1 C
Tai Po                        8.3 C               13.5 C
Sha Tin                       8.9 C               13.9 C
Tuen Mun                      9.3 C               13.9 C
Tseung Kwan O                 9.4 C               16.6 C
Sai Kung                      8.9 C               14.2 C
Cheung Chau                   9.5 C               16.6 C
Chek Lap Kok                  9.4 C               13.9 C
Tsing Yi                      9.8 C               16.0 C
Shek Kong                     8.3 C               14.3 C
Tsuen Wan Ho Koon             7.1 C               13.7 C
Tsuen Wan Shing Mun Valley    9.5 C               16.4 C
Hong Kong Park               10.2 C               17.1 C
Shau Kei Wan                  9.9 C               17.8 C
Kowloon City                  8.8 C               15.2 C
Happy Valley                 10.5 C               17.1 C
Wong Tai Sin                  9.5 C               15.5 C
Stanley                      10.8 C               17.8 C
Kwun Tong                     9.5 C               17.1 C
Sham Shui Po                  9.6 C               17.2 C
Kai Tak Runway Park           9.9 C               16.8 C
Yuen Long Park                8.4 C               14.0 C
Tai Mei Tuk                8.4 C               15.7 C

Duration of sunshine (King's Park):              5.6 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.
 

Yesterday's (30 Dec 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                         0.10
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 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 30 Dec
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