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Bulletin issued at 22:02 HKT 17/Nov/2019

At 10 p.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 81 per cent.

The air temperatures at other places were:

King's Park 22 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 20 degrees;
Lau Fau Shan 22 degrees;
Tai Po 21 degrees;
Sha Tin 21 degrees;
Tseung Kwan O 20 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 24 degrees;
Tsing Yi 21 degrees;
Shek Kong 21 degrees;
Tsuen Wan Ho Koon 20 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 22 degrees;
Kowloon City 22 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 22 degrees;
Stanley 21 degrees;
Kwun Tong 22 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 22 degrees.

Here is the information on Tropical Storm Kalmaegi at 8 p.m.:
Location: 16.8 degrees north, 124.2 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

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Bulletin updated at 21:45 HKT 17/Nov/2019

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

The northeast monsoon is bringing generally fine weather to southern China. Besides, a cold front has formed over central China, and is moving southwards gradually. It is expected to move across the coastal areas tomorrow night.

At 8 p.m., Tropical Storm Kalmaegi was centred about 430 kilometres northeast of Manila. It is forecast to move northwest at about 12 kilometres per hour towards Luzon.

Weather forecast for tonight and tomorrow

Mainly fine. The minimum temperature will be about 22 degrees in the morning. Dry during the day with a maximum temperature of around 28 degrees. Appreciably cooler tomorrow night with temperatures falling to around 19 degrees. Light winds, becoming moderate northerlies tomorrow, strengthening gradually later.

Outlook : Cooler in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/11/2019; 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 17/Nov/2019

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND BALINTANG.

GENERAL SITUATION AT 170900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= E 4, BEC N TO NE 4-5. FINE. SEA UP TO 2 M. SWELL NE UP TO 2 M. TEMP 19-28 C. =
KWANGTUNG= NE 4-5, BEC N TO NE 5-6. FINE. SEA UP TO 2 M, BEC 2-3 M. SWELL NE 2 M. =
TAIWAN STRAIT= NE 4-5, 7-8 LATER. CLD. SEA UP TO 2 M, 4-6 M LATER. SWELL NE 3 M. =
BASHI= NE 6-7, 7-8 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, 4-6 M LATER. SWELL E TO NE 3-5 M. =
PRATAS= NE 5-6, OCNL 7. CLD. SEA UP TO 4 M. SWELL NE 2-3 M. =
BALINTANG= NE 6-7, 7-8 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, 4-6 M LATER. SWELL E TO NE 3-5 M. =
SCARBOROUGH= NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL NE 2-3 M. =
TONKIN= E 4-5, BEC N TO NE 5-6. CLD. SEA UP TO 2 M, BEC 2-3 M. =
DANANG= E TO NE 4-5. CLD. SEA UP TO 2 M. 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.


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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 19:30 HKT 17/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 17 November 2019

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

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters. Besides, a cold front has formed over central China, and is moving southwards gradually. It is expected to move across the coastal areas tomorrow night.

    At 7 p.m., Tropical Storm Kalmaegi with maximum sustained winds of about 75 kilometres per hour near its centre was located at 16.8 degrees north, 124.4 degrees east. It is forecast to move northwest at about 12 kilometres per hour towards Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4, becoming north to northeast force 4 to 5.
    Moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    Northeast force 4 to 5, becoming north to northeast force 5 to 6.
    Moderate seas, becoming moderate to rough.

    Shangchuan Dao:
    East to northeast force 4 to 5, becoming north to northeast force 5 to 6.
    Moderate seas, becoming moderate to rough.

    Outlook for the next 48 hours
    North to northeasterly winds of force 6 to 7, occasionally force 8.

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

    Waglan Island Wind east-southeast force 1
      Visibility 25 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 4

    Macau Wind south-southeast force 2
      Visibility 12 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 22 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 17/NOV/2019
    (Next update at 01:30 HKT 18/NOV/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS BRINGING GENERALLY FINE
     WEATHER TO SOUTHERN CHINA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10
                  BECMG 360/5
       OFFSHORE:  090/15-20
                  BECMG 360/10                         26-20
   B.   2000 FT:  200/5
                  BECMG 360/5-10                       20
   C.   5000 FT:  200/5
                  BECMG 360/5-10                       16
   D.  10000 FT:  270/15                               5
   E.  18000 FT:  270/25                               MS3
   F.  24000 FT:  300/35                               MS17
   G.  30000 FT:  300/30                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 8 KM.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 8400, 11000, 13200 FT
   M. TURBULENCE    : MOD OFFSHORE
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS. MAINLY
     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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    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.

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    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 21:30 HKT 17/Nov/2019


    Tropical Cyclone Warning

    At 171200 UTC, Tropical Storm Kalmaegi (1926) with central pressure 995 hectopascals was centred within 60 nautical miles of one six point eight degrees north (16.8 N) one two four point zero degrees east (124.0 E) and is forecast to move northwest at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 120 nautical miles over southern semicircle, 180 nautical miles elsewhere.

    Forecast position and intensity at 181200 UTC
    One eight point six degrees north (18.6 N)
    One two three point zero degrees east (123.0 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 191200 UTC
    One eight point four degrees north (18.4 N)
    One two one point six degrees east (121.6 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 201200 UTC
    Dissipated over sea.



    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/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.6 C
Minimum Air Temperature                     21.5 C
Grass Minimum Temperature                   19.1 C
Relative Humidity                        66 - 84 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2358.1 mm

Other Stations                Min                  Max
King's Park                  20.4 C               25.5 C
Wong Chuk Hang               19.6 C               25.8 C
Ta Kwu Ling                  17.9 C               27.5 C
Lau Fau Shan                 18.3 C               26.8 C
Tai Po                       19.7 C               24.9 C
Sha Tin                      19.1 C               25.9 C
Tseung Kwan O                19.0 C               25.5 C
Sai Kung                     20.0 C               23.8 C
Cheung Chau                  19.2 C               27.6 C
Chek Lap Kok                 20.9 C               27.7 C
Tsing Yi                     20.1 C               26.7 C
Shek Kong                    17.9 C               27.3 C
Tsuen Wan Ho Koon            17.8 C               25.8 C
Tsuen Wan Shing Mun Valley   18.8 C               27.9 C
Hong Kong Park               20.3 C               26.2 C
Shau Kei Wan                 20.6 C               24.6 C
Kowloon City                 20.2 C               26.9 C
Happy Valley                 19.6 C               26.7 C
Wong Tai Sin                 20.6 C               26.6 C
Stanley                      21.3 C               24.2 C
Kwun Tong                    20.1 C               25.6 C
Sham Shui Po                 20.2 C               28.0 C
Kai Tak Runway Park          21.7 C               24.8 C
Yuen Long Park               17.2 C               28.0 C
Tai Mei Tuk               19.7 C               27.0 C

Duration of sunshine (King's Park):              6.8 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 (16 Nov 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
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 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 16 Nov
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