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Bulletin issued at 04:02 HKT 30/Dec/2018

At 4 a.m. at the Hong Kong Observatory the air temperature was 11 degrees Celsius and the relative humidity 72 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 10 degrees;
Wong Chuk Hang 11 degrees;
Ta Kwu Ling 9 degrees;
Lau Fau Shan 9 degrees;
Tai Po 9 degrees;
Sha Tin 10 degrees;
Tuen Mun 10 degrees;
Tseung Kwan O 10 degrees;
Sai Kung 10 degrees;
Cheung Chau 10 degrees;
Chek Lap Kok 11 degrees;
Tsing Yi 11 degrees;
Shek Kong 9 degrees;
Tsuen Wan Ho Koon 8 degrees;
Tsuen Wan Shing Mun Valley 10 degrees;
Hong Kong Park 11 degrees;
Shau Kei Wan 11 degrees;
Kowloon City 10 degrees;
Happy Valley 11 degrees;
Wong Tai Sin 11 degrees;
Stanley 12 degrees;
Kwun Tong 10 degrees;
Sham Shui Po 11 degrees;
Kai Tak Runway Park 11 degrees;
Yuen Long Park 9 degrees;
Tai Mei Tuk 10 degrees.

Here is the information on Tropical Depression at 4 a.m.:
Location: 10.0 degrees north, 120.9 degrees east.


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


Climatological Information for 30 Dec

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 03:45 HKT 30/Dec/2018

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

The winter monsoon is bringing cold weather to Guangdong.

At 4 a.m., the tropical depression over the Philippines was centred about 500 kilometres south of Manila. It is forecast to move west-southwest at about 30 kilometres per hour towards the southern part of the South China Sea.

Weather forecast for today

Mainly cloudy. Cold with one or two light rain patches in the morning and at night. The minimum temperature will be about 11 degrees in the urban areas, and a couple of degrees lower in the New Territories. Bright periods during the day with a maximum temperature of around 15 degrees. Moderate to fresh northerly winds, occasionally strong offshore and on high ground.

Outlook : Cold weather will persist and it will be windier in the following few days. A few rain patches midweek this week.


(The above forecast period is valid up to 23:59 HKT today, 30/12/2018; 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 29/Dec/2018

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

GENERAL SITUATION AT 290900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION OVER THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 291300 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. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 3-4 M. =
TAIWAN STRAIT= N TO NE 8-9. LGT RAIN PATCHES. SEA 6-8 M. SWELL N TO NE 5 M. =
BASHI= N TO NE 8-9. RAIN PATCHES. SEA 6-8 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. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL N TO NE 5 M. =
SCARBOROUGH= N TO NE 8-9, OCNL 10. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 5 M. =
PARACEL= N TO NE 7-8, OCNL 9. RAIN PATCHES. 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. RAIN PATCHES. SEA 4-6 M. SWELL NE 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 03:30 HKT 30/Dec/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.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.

    At 3 a.m., the tropical depression over the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located near 10.2 degrees north, 121.0 degrees east. It is forecast to move west-southwest at about 30 kilometres per hour towards the southern part of the South China Sea.

    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 and 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 6
      Visibility 9 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 25 Kilometres

    Huangmaozhou Wind northeast force 5

    Macau Wind north force 4
      Visibility 8 Kilometres

    Xisha Wind northeast force 3
      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 30/DEC/2018
    (Next update at 9:00-9:30 HKT 30/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.  AT 11 P.M. LAST
     NIGHT, THE TROPICAL DEPRESSION OVER THE
     PHILIPPINES WAS LOCATED NEAR 11.4 DEGREES NORTH,
     121.5 DEGREES EAST. IT IS FORECAST TO MOVE WEST
     AT ABOUT 14 KNOTS ACROSS THE CENTRAL PART OF THE
     PHILIPPINES.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/15-20
       OFFSHORE:  020/20-25                            9-12
   B.   2000 FT:  060/20-25                            6
   C.   5000 FT:  090/20-25                            12
   D.  10000 FT:  250/10                               5
   E.  18000 FT:  240/30                               MS5
   F.  24000 FT:  250/40                               MS13
   G.  30000 FT:  250/50                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4100-5000 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW LIGHT RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT  BKN 8000 FT.
   K. VISIBILITY    : 9 KM. TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : NEAR SURFACE ,4400,6000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 20 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS, OCCASIONALLY
     STRONG OFFSHORE AND ON HIGH GROUND. BRIGHT
     PERIODS.=

    ===================================================================
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 03:30 HKT 30/Dec/2018


    Tropical Cyclone Warning

    At 291800 UTC, the tropical depression over the Philippines with central pressure 1002 hectopascals was centred within 90 nautical miles of one zero point four degrees north (10.4 N) one two one point one degrees east (121.1 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.

    Forecast position and intensity at 301800 UTC
    Eight point two degrees north (8.2 N)
    One one three point seven degrees east (113.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 311800 UTC
    Six point two degrees north (6.2 N)
    One one zero point five degrees east (110.5 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 011800 UTC
    Six point one degrees north (6.1 N)
    One zero eight point one degrees east (108.1 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 021800 UTC
    Six point five degrees north (6.5 N)
    One zero four point nine degrees east (104.9 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 031800 UTC
    Eight point two degrees north (8.2 N)
    One zero one point zero degrees east (101.0 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 30/Dec/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     16.3 C
Minimum Air Temperature                     12.5 C
Grass Minimum Temperature                   13.4 C
Relative Humidity                        60 - 72 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2162.9 mm
Against an average of                     2393.9 mm

Other Stations                Min                  Max
King's Park                  11.5 C               15.3 C
Wong Chuk Hang               12.2 C               16.4 C
Ta Kwu Ling                   9.6 C               14.6 C
Lau Fau Shan                  9.9 C               14.0 C
Tai Po                       10.1 C               16.3 C
Sha Tin                      11.4 C               15.7 C
Tuen Mun                     10.9 C               15.0 C
Tseung Kwan O                11.1 C               15.1 C
Sai Kung                     11.2 C               14.6 C
Cheung Chau                  11.3 C               16.2 C
Chek Lap Kok                 11.4 C               16.0 C
Tsing Yi                     12.1 C               15.9 C
Shek Kong                    10.0 C               14.7 C
Tsuen Wan Ho Koon             9.6 C               14.2 C
Tsuen Wan Shing Mun Valley   11.1 C               16.8 C
Hong Kong Park               12.3 C               16.1 C
Shau Kei Wan                 11.7 C               15.6 C
Kowloon City                 11.1 C               15.0 C
Happy Valley                 12.5 C               16.7 C
Wong Tai Sin                 11.7 C               16.1 C
Stanley                      12.1 C               15.7 C
Kwun Tong                    11.0 C               15.3 C
Sham Shui Po                 11.4 C               16.4 C
Kai Tak Runway Park          12.5 C               16.1 C
Yuen Long Park                9.9 C               14.3 C
Tai Mei Tuk               10.7 C               16.9 C

Duration of sunshine (King's Park):              0.6 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 (29 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                           0.13
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 29 Dec
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