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Bulletin issued at 10:02 HKT 18/Nov/2019

At 10 a.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 68 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 24 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 25 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 24 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 28 degrees;
Stanley 26 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Tropical Storm Kalmaegi at 10 a.m.:
Location: 17.7 degrees north, 123.4 degrees east.


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


Climatological Information for 18 Nov

Regional Weather in Hong Kong

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Bulletin updated at 09:45 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 10 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

Fine. Dry during the day apart from some haze. 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 09:00 HKT 18/Nov/2019

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS AND BALINTANG.

GENERAL SITUATION AT 172100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. COLD FRONT 23N 110E 25N 115E 28N 120E 28N 123E S SLOWLY

MARINE FORECAST FOR 24 HOURS FROM 180100 UTC:

HONG KONG= N TO NE 4-5, OCNL 6 LATER. FINE. SEA UP TO 2 M, UP TO 3 M LATER. SWELL NE UP TO 2 M. TEMP 28-17 C. =
KWANGTUNG= N TO NE 5-6, UP TO 8 IN E LATER. FINE. SEA 2-3 M, UP TO 6 M IN E LATER. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 6-7, 8-9 LATER. CLD. SEA 3-4 M, 6-8 M LATER. SWELL NE 3-5 M. =
BASHI= NE 6-7, OCNL 8, UP TO 9 LATER. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M, UP TO 8 M LATER. SWELL E TO NE 3-5 M. =
PRATAS= NE 5-6, OCNL 7, UP TO 8 LATER. CLD. SEA UP TO 4 M, UP TO 6 M LATER. SWELL NE 2-3 M. =
BALINTANG= NE 7-8, BEC CYCLONIC 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 6-8 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= NE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= NE 4-5, OCNL 6, UP TO 7 LATER. ISOL SHOWERS. SEA UP TO 3 M, UP TO 4 M LATER. SWELL NE 2-3 M. =
TONKIN= N TO NE 4-5, OCNL 6. CLD. SEA UP TO 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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    South China Coastal Waters

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    Bulletin issued at 10:00 HKT 18/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:00 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.

    At 10 a.m., Tropical Storm Kalmaegi with maximum sustained winds of about 85 kilometres per hour near its centre was located at 17.7 degrees north, 123.4 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.
    Some haze.
    Moderate seas, becoming moderate to rough later.

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

    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:
    Northeast force 4 to 5. Becoming 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 southeast force 1
      Visibility 15 Kilometres

    Shantou Wind northeast force 1
      Visibility 10 Kilometres

    Dongsha Wind north-northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 2

    Macau Wind north force 1
      Visibility 4500 Metres in mist

    Xisha Wind northeast force 2
      Visibility 21 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 18/NOV/2019
    (Next update at 12:30 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 9 A.M., TROPICAL STORM KALMAEGI WAS CENTRED
     AT 17.7 DEGREES NORTH, 123.4 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTHWEST AT ABOUT 5 KNOT
     TOWARDS LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/5-10 BECMG 15G25
       OFFSHORE:  360/5-10 BECMG 20-25                 28-20
   B.   2000 FT:  010/15-20 BECMG 25                   22
   C.   5000 FT:  010/15                               18
   D.  10000 FT:  040/20                               6
   E.  18000 FT:  260/25                               MS2
   F.  24000 FT:  290/25                               MS15
   G.  30000 FT:  280/35                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE. LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 6 KM TEMPO 3000 M IN HAZE.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 8400, 11200, 13200 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.5-3.0 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS, OCCASIONALLY
     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.

    There is no Significant Weather Information (SIGMET)

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    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 09:30 HKT 18/Nov/2019


    Tropical Cyclone Warning

    At 180000 UTC, Tropical Storm Kalmaegi (1926) with central pressure 990 hectopascals was centred within 60 nautical miles of one seven point six degrees north (17.6 N) one two three point five degrees east (123.5 E) and is forecast to move northwest at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 190000 UTC
    One eight point eight degrees north (18.8 N)
    One two two point one degrees east (122.1 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 200000 UTC
    One six point six degrees north (16.6 N)
    One one nine point one degrees east (119.1 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 210000 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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