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Bulletin issued at 04:02 HKT 29/Jan/2018

At 4 a.m. at the Hong Kong Observatory the air temperature was 11 degrees Celsius and the relative humidity 75 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 8 degrees;
Lau Fau Shan 9 degrees;
Tai Po 8 degrees;
Sha Tin 9 degrees;
Tuen Mun 9 degrees;
Tseung Kwan O 10 degrees;
Sai Kung 9 degrees;
Cheung Chau 9 degrees;
Chek Lap Kok 10 degrees;
Tsing Yi 10 degrees;
Shek Kong 8 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 9 degrees;
Happy Valley 11 degrees;
Wong Tai Sin 9 degrees;
Stanley 11 degrees;
Kwun Tong 10 degrees;
Sham Shui Po 10 degrees;
Kai Tak Runway Park 11 degrees;
Yuen Long Park 8 degrees;
Tai Mei Tuk 8 degrees.

Between 2:45 and 3:45 a.m., the rainfall recorded in various regions were:

Tai Po 0 to 1 mm;
Tuen Mun 0 to 1 mm;
Yuen Long 0 to 1 mm.


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


Climatological Information for 29 Jan

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 03:45 HKT 29/Jan/2018

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

An intense winter monsoon is affecting the coast of Guangdong.

Weather forecast for today

Cloudy to overcast with one or two rain patches. It will be cold. The minimum temperature will be around 9 degrees in the urban areas, and a couple of degrees lower in the New Territories. Temperatures will linger around 10 degrees during the day. Moderate to fresh northerly winds, occasionally strong offshore and on high ground.

Outlook : Cold weather will persist this week. The minimum temperature will be generally 9 degrees or below. Sunny periods in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT today, 29/01/2018; 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 28/Jan/2018

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

GENERAL SITUATION AT 280900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS GRADUALLY. COLD FRONT 19N 109E 21N 115E 23N 120E S 15KT.

MARINE FORECAST FOR 24 HOURS FROM 281300 UTC:

HONG KONG= N 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2 M. TEMP 9-12 C. =
KWANGTUNG= N 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= N TO NE 7-8, SE 4-5 AT FIRST. RAIN PATCHES. SEA 4-6 M, UP TO 2 M AT FIRST. SWELL NE 2-3 M. =
PRATAS= N TO NE 6-7, OCNL 8, NE 4-5 AT FIRST. RAIN PATCHES. SEA UP TO 6 M, UP TO 2 M AT FIRST. SWELL NE 2-3 M. =
BALINTANG= N TO NE 7-8, SE 4-5 AT FIRST. RAIN PATCHES. SEA 4-6 M, UP TO 2 M AT FIRST. SWELL NE 2-3 M. =
SCARBOROUGH= NE 4-5, 6-7 LATER. RAIN PATCHES. SEA UP TO 2 M, 3-4 M LATER. SWELL NE 2-3 M. =
PARACEL= N TO NE 6-7, OCNL 8, NE 4-5 AT FIRST. RAIN PATCHES. SEA UP TO 6 M, UP TO 2 M AT FIRST. SWELL E TO NE 2-3 M. =
TONKIN= N 6-7, OCNL 8. RAIN PATCHES. SEA UP TO 6 M. SWELL NE 2-3 M. =
DANANG= N 6-7, E 4-5 AT FIRST. RAIN PATCHES. SEA 3-4 M, UP TO 2 M AT FIRST. SWELL E TO 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.


  • 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 03:30 HKT 29/Jan/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 29 January 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    An intense winter monsoon 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:
    North to northeast force 7 to 8.
    Rough to very rough seas.

    Shanwei, South of Hong Kong and Shangchuan Dao:
    North force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7, occasionally force 8 in east.

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

    Waglan Island Wind north force 5
      Visibility 47 Kilometres

    Shantou Wind west-southwest force 2
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 5

    Macau Wind north force 3
      Visibility 20 Kilometres

    Xisha Wind northeast force 2
      Visibility 19 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 29/JAN/2018
    (Next update at 9:00-9:30 HKT 29/JAN/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN INTENSE WINTER MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL WATERS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/10-15, OCNL 20 AT FIRST
       OFFSHORE:  360/20-25, OCNL 30 AT FIRST          8-10
   B.   2000 FT:  010/20-25, OCNL 30 AT FIRST          7
   C.   5000 FT:  250/10                               9
   D.  10000 FT:  270/35                               4
   E.  18000 FT:  280/55                               MS4
   F.  24000 FT:  280/60                               MS15
   G.  30000 FT:  270/70                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1700-4500 FT
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH ONE OR TWO RAIN
      PATCHES. LOCALISED MIST AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2000 FT. BKN 5000 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN RAIN/MIST.
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : NEAR THE SURFACE, 6800 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.5-4.0 M     SEA TEMPERATURE    : 17 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, FRESH OFFSHORE. CLOUDY
     TO OVERCAST WITH ONE OR TWO 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.

    sigmet
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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 29/Jan/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     18.4 C
Minimum Air Temperature                     12.6 C
Grass Minimum Temperature                   14.1 C
Relative Humidity                        73 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January            42.6 mm
Against an average of                       22.9 mm

Other Stations                Min                  Max
King's Park                  11.8 C               18.7 C
Wong Chuk Hang               12.8 C               18.8 C
Ta Kwu Ling                   8.8 C               17.2 C
Lau Fau Shan                  9.4 C               18.5 C
Tai Po                       10.1 C               17.2 C
Sha Tin                      10.1 C               17.9 C
Tuen Mun                     10.9 C               18.3 C
Tseung Kwan O                12.0 C               19.0 C
Sai Kung                     10.9 C               17.8 C
Cheung Chau                  11.3 C               18.3 C
Chek Lap Kok                 10.4 C               18.7 C
Tsing Yi                     11.0 C               18.8 C
Shek Kong                    10.3 C               17.7 C
Tsuen Wan Ho Koon             8.9 C               17.0 C
Tsuen Wan Shing Mun Valley   11.4 C               18.4 C
Hong Kong Park               12.7 C               18.9 C
Shau Kei Wan                 12.0 C               19.2 C
Kowloon City                 10.8 C               18.4 C
Happy Valley                 12.9 C               19.7 C
Wong Tai Sin                 10.6 C               18.5 C
Stanley                      13.4 C               19.0 C
Kwun Tong                    12.2 C               19.2 C
Sham Shui Po                 11.7 C               19.0 C
Kai Tak Runway Park          12.8 C               19.3 C
Yuen Long Park               10.2 C               17.9 C
Tai Mei Tuk               10.6 C               18.2 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.9,
the UV intensity was Low.
The maximum UV index for yesterday was 2.
Sea surface temperature (Waglan Island):        17.0 C 

Yesterday's (28 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 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 28 Jan
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