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Bulletin issued at 05:02 HKT 18/Nov/2019

At 5 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 83 per cent.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 19 degrees;
Ta Kwu Ling 17 degrees;
Lau Fau Shan 20 degrees;
Tai Po 20 degrees;
Sha Tin 19 degrees;
Tseung Kwan O 19 degrees;
Sai Kung 20 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 22 degrees;
Tsing Yi 20 degrees;
Shek Kong 18 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 19 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 21 degrees;
Happy Valley 19 degrees;
Wong Tai Sin 20 degrees;
Stanley 20 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 21 degrees;
Kai Tak Runway Park 21 degrees;
Yuen Long Park 18 degrees;
Tai Mei Tuk 20 degrees.

Here is the information on Tropical Storm Kalmaegi at 5 a.m.:
Location: 17.6 degrees north, 123.6 degrees east.


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


Climatological Information for 18 Nov

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Bulletin updated at 04:45 HKT 18/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 over the northern part of southern China is moving southwards gradually. It is expected to move across the coastal areas tonight.

At 5 a.m., Tropical Storm Kalmaegi was centred about 440 kilometres northeast of Manila. It is forecast to move northwest at about 10 kilometres per hour towards Luzon.

Weather forecast for today

Mainly fine. Dry during the day. The maximum temperature will be about 28 degrees. Moderate northerly winds, strengthening later. The weather will be appreciably cooler with temperatures falling to around 19 degrees at midnight.

Outlook : Cooler in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 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 05:30 HKT 18/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 18 November 2019

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

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters. Besides, a cold front over the northern part of southern China is moving southwards gradually. It is expected to move across the coastal areas tonight.

    At 5 a.m., Tropical Storm Kalmaegi with maximum sustained winds of about 75 kilometres per hour near its centre was located at 17.6 degrees north, 123.6 degrees east. It is forecast to move northwest at about 10 kilometres per hour towards Luzon.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 4 to 5, occasionally force 6 later.
    Moderate seas, becoming moderate to rough later.

    Nan'ao:
    North to northeast force 5 to 6, force 7 to 8 later.
    Moderate to rough seas, becoming rough to very rough later.

    Shanwei and South of Hong Kong:
    North to northeast force 4 to 5, force 6 to 7 later.
    Moderate seas, becoming rough later.

    Shangchuan Dao:
    East to northeast force 4 to 5, becoming north to northeast force 5 to 6, occasionally up to force 7.
    Moderate seas, becoming moderate to rough.

    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 1
      Visibility 18 Kilometres

    Shantou Wind east force 1
      Visibility 6 Kilometres in mist

    Dongsha Wind north-northeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 1

    Macau Wind west-southwest force 2
      Visibility 6 Kilometres

    Xisha Wind northeast force 1
      Visibility 24 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 18/NOV/2019
    (Next update at 9:00-9:30 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. 
     AT 11 P.M. LAST NIGHT, TROPICAL STORM KALMAEGI
     WAS CENTRED AT 17.0 DEGREES NORTH, 123.9 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTHWEST OR
     NORTH-NORTHWEST AT ABOUT 5 KNOT TOWARDS LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5
                  BECMG  360/10
       OFFSHORE:  080/5-10
                  BECMG 360/10                         21-28
   B.   2000 FT:  020/15-20                            20
   C.   5000 FT:  020/10-15                            16
   D.  10000 FT:  350/10                               7
   E.  18000 FT:  270/25                               MS1
   F.  24000 FT:  300/25                               MS15
   G.  30000 FT:  300/30                               MS26
   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: 17500 FT      10 DEG. C LEVEL(S) : 8400, 11000, 13200 FT
   M. TURBULENCE    : MOD NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS, OCCASIOANLLY
     STRONG OFFSHORE. 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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    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.

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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 18/Nov/2019


    Tropical Cyclone Warning

    At 171800 UTC, Tropical Storm Kalmaegi (1926) with central pressure 995 hectopascals was centred within 60 nautical miles of one seven point three degrees north (17.3 N) one two three point nine degrees east (123.9 E) and is forecast to move north-northwest at about 5 knots for the next 24 hours.

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

    Radius of over 33 knot winds 90 nautical miles over northern semicircle, 60 nautical miles elsewhere.
    Radius of over 2 metre waves 180 nautical miles over northern semicircle, 120 nautical miles elsewhere.

    Forecast position and intensity at 181800 UTC
    One eight point eight degrees north (18.8 N)
    One two two point five degrees east (122.5 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 191800 UTC
    One seven point five degrees north (17.5 N)
    One two zero point four degrees east (120.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 201800 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 18/Nov/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.5 C
Minimum Air Temperature                     21.4 C
Grass Minimum Temperature                   18.9 C
Relative Humidity                        66 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2358.4 mm

Other Stations                Min                  Max
King's Park                  20.6 C               27.3 C
Wong Chuk Hang               19.8 C               27.0 C
Ta Kwu Ling                  16.2 C               29.0 C
Lau Fau Shan                 18.3 C               26.5 C
Tai Po                       19.3 C               26.6 C
Sha Tin                      18.5 C               27.4 C
Tseung Kwan O                19.5 C               27.7 C
Sai Kung                     20.3 C               25.6 C
Cheung Chau                  19.9 C               29.4 C
Chek Lap Kok                 21.7 C               27.8 C
Tsing Yi                     20.1 C               28.2 C
Shek Kong                    16.9 C               28.4 C
Tsuen Wan Ho Koon            18.3 C               27.2 C
Tsuen Wan Shing Mun Valley   18.9 C               29.7 C
Hong Kong Park               20.5 C               27.6 C
Shau Kei Wan                 20.7 C               25.5 C
Kowloon City                 20.3 C               28.5 C
Happy Valley                 20.0 C               27.6 C
Wong Tai Sin                 20.4 C               29.0 C
Stanley                      20.8 C               26.2 C
Kwun Tong                    20.6 C               27.5 C
Sham Shui Po                 20.2 C               29.5 C
Kai Tak Runway Park          21.9 C               25.8 C
Yuen Long Park               16.7 C               29.4 C
Tai Mei Tuk               20.3 C               28.7 C

Duration of sunshine (King's Park):              9.8 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.
 

Yesterday's (17 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 17 Nov
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