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Bulletin issued at 21:02 HKT 17/Nov/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 24 degrees Celsius and the relative humidity 87 per cent.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 23 degrees;
Ta Kwu Ling 23 degrees;
Lau Fau Shan 24 degrees;
Tai Po 23 degrees;
Sha Tin 23 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 22 degrees;
Sai Kung 24 degrees;
Cheung Chau 23 degrees;
Chek Lap Kok 25 degrees;
Tsing Yi 24 degrees;
Shek Kong 24 degrees;
Tsuen Wan Ho Koon 22 degrees;
Tsuen Wan Shing Mun Valley 23 degrees;
Hong Kong Park 24 degrees;
Shau Kei Wan 23 degrees;
Kowloon City 23 degrees;
Happy Valley 24 degrees;
Wong Tai Sin 24 degrees;
Stanley 23 degrees;
Kwun Tong 23 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 24 degrees;
Tai Mei Tuk 23 degrees.

Here is the information on Tropical Depression at 8 p.m.:
Location: 10.1 degrees north, 116.5 degrees east.


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


Climatological Information for 17 Nov

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 20:45 HKT 17/Nov/2017

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

A cold front has formed over central China and is moving southwards gradually. The associated northeast monsoon will reach the south China coast tomorrow.

At 8 p.m., the tropical depression near the Philippines was centred about 240 kilometres east of Nansha Dao. It is forecast to move west-northwest at about 18 kilometres per hour across the southern part of the South China Sea.

Weather forecast for tonight and tomorrow

Mainly fine. Light winds. Visibility relatively low tomorrow morning. The maximum temperature will be around 25 degrees. Becoming cloudy with a few rain patches in the afternoon, winds strengthening from the north. Temperatures falling appreciably to around 19 degrees tomorrow night.

Outlook : Windy with light rain on Sunday. Cool early next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/11/2017; 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 21:25 HKT 17/Nov/2017

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND TONKIN.

GENERAL SITUATION AT 170900 UTC:
THE NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS. COLD FRONT 28N 110E 30N 116E S 12KT. FOR DETAILS ON TROPICAL DEPRESSION NEAR THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 171325 UTC:

HONG KONG= E 4-5, BEC N 6. DOWN TO 4000 M IN MIST, RAIN PATCHES LATER. SEA UP TO 2 M, BEC 3 M. SWELL NE UP TO 2 M. TEMP 19-25 C. =
KWANGTUNG= E TO NE 4-5, BEC N TO NE 6-7. RAIN PATCHES. SEA UP TO 2 M, BEC 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= E TO NE 4-5, BEC N TO NE 8-9. RAIN PATCHES. SEA UP TO 2 M, BEC 6-8 M. SWELL NE 2 M, UP TO 3 M LATER. =
BASHI= E 4-5, N TO NE 7-8 LATER. RAIN PATCHES. SEA UP TO 2 M, 4-6 M LATER. SWELL NE 2 M, UP TO 3 M LATER. =
PRATAS= E TO NE 4-5, N TO NE 6 LATER. RAIN PATCHES. SEA UP TO 2 M, 3 M LATER. SWELL NE 2 M. =
BALINTANG= E 4-5, N TO NE 6-7 LATER. RAIN PATCHES. SEA UP TO 2 M, 3-4 M LATER. SWELL NE 2 M, UP TO 3 M LATER. =
SCARBOROUGH= E TO NE 4-5, N TO NE 5-6 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M, 2-3 M LATER. SWELL NE 2 M. =
PARACEL= E TO NE 4-5, N TO NE 6 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M, 3 M LATER. SWELL NE 2 M. =
TONKIN= E TO SE 4-5, N TO NE 7-8 LATER. RAIN PATCHES. SEA UP TO 2 M, 4-6 M LATER. SWELL E UP TO 2 M. =
DANANG= E TO SE 4-5, N TO NE 6-7 LATER. ISOL SHOWERS AND TS IN S. SEA UP TO 2 M, 3-4 M LATER. 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.


  • 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 17/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 17 November 2017

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

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters. Meanwhile, a cold front has formed over central China and is moving southwards gradually. The associated northeast monsoon will reach the south China coast tomorrow.

    At 7 p.m., the tropical depression near the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located near 10.1 degrees north, 116.6 degrees east. It is forecast to move west-northwest at about 18 kilometres per hour across the southern part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, becoming north force 6.
    Visibility relatively low in some areas tomorrow morning. A few rain patches later tomorrow.
    Moderate seas, becoming rough seas.

    Nan'ao:
    East force 4 to 5, becoming north to northeast force 7 to 8.
    Moderate seas, becoming rough to very rough.

    Shanwei:
    East force 4 to 5, becoming north to northeast force 6 to 7.
    Moderate seas, becoming rough.

    South of Hong Kong and Shangchuan Dao:
    East force 4 to 5, becoming north to northeast force 6.
    Moderate seas, becoming rough.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, force 8 in east. Isolated showers and thunderstorms.

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

    Waglan Island Wind northeast force 2
      Visibility 5000 Metres

    Shantou Wind east force 2
      Visibility 30 Kilometres

    Dongsha Wind east force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 3

    Macau Wind east-southeast force 1
      Visibility 6 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 22 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 17/NOV/2017
    (Next update at 01:30 HKT 18/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM 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:  080/5-10                             27-22
   B.   2000 FT:  180/10                               19
   C.   5000 FT:  280/10                               18
   D.  10000 FT:  250/20                               11
   E.  18000 FT:  280/20                               MS2
   F.  24000 FT:  300/20                               MS16
   G.  30000 FT:  290/30                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1200-1600 FT
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT
   K. VISIBILITY    : 8 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 0.5-1.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHEASTERLY WINDS. MAINLY
     CLOUDY.=

    ===================================================================
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 10:00 HKT on 15 Nov 17

    VHHK SIGMET Z99 VALID 150200/150210 VHHH- VHHK HONG KONG FIR THIS IS A TEST SIGMET, PLEASE DISREGARD=

    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 21:30 HKT 17/Nov/2017


    Tropical Cyclone Warning

    At 171200 UTC, Tropical Depression near the Philippines with central pressure 1000 hectopascals was centred within 90 nautical miles of one zero point two degrees north (10.2 N) one one six point six degrees east (116.6 E) and is forecast to move west-northwest at about 10 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 181200 UTC
    One one point two degrees north (11.2 N)
    One one two point nine degrees east (112.9 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 191200 UTC
    Dissipated over land.



    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 17/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.2 C
Minimum Air Temperature                     22.2 C
Grass Minimum Temperature                   21.2 C
Relative Humidity                        70 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2568.9 mm
Against an average of                     2358.1 mm

Other Stations                Min                  Max
King's Park                  21.8 C               26.3 C
Wong Chuk Hang               22.6 C               26.7 C
Ta Kwu Ling                  21.8 C               26.8 C
Lau Fau Shan                 20.4 C               28.4 C
Tai Po                       22.5 C               24.8 C
Sha Tin                      22.6 C               26.4 C
Tuen Mun                     21.7 C               27.6 C
Tseung Kwan O                21.8 C               25.7 C
Sai Kung                     22.7 C               25.0 C
Cheung Chau                  21.8 C               26.0 C
Chek Lap Kok                 23.0 C               28.9 C
Tsing Yi                     22.8 C               27.7 C
Shek Kong                    20.9 C               27.9 C
Tsuen Wan Ho Koon            20.7 C               26.6 C
Tsuen Wan Shing Mun Valley   22.2 C               27.6 C
Hong Kong Park               22.2 C               26.4 C
Shau Kei Wan                 22.0 C               25.2 C
Kowloon City                 21.9 C               27.1 C
Happy Valley                 22.3 C               27.0 C
Wong Tai Sin                 21.9 C               26.4 C
Stanley                      22.1 C               25.2 C
Kwun Tong                    21.8 C               25.1 C
Sham Shui Po                 22.6 C               27.9 C
Kai Tak Runway Park          22.8 C               25.4 C
Yuen Long Park               20.4 C               28.6 C
Tai Mei Tuk               21.9 C               26.2 C

Duration of sunshine (King's Park):              7.9 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 6.
Sea surface temperature (Waglan Island):        23.7 C 

Yesterday's (16 Nov 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                               0.09
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                        0.14

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 16 Nov
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