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Bulletin issued at 00:02 HKT 19/Nov/2019

At midnight at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 65 per cent.

The air temperatures at other places were:

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

Here is the information on Severe Tropical Storm Kalmaegi at 11:00 p.m. yesterday:
Location: 18.9 degrees north, 122.6 degrees east.


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


Climatological Information for 19 Nov

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Bulletin updated at 00:00 HKT 19/Nov/2019

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

Locally, the weather was fine yesterday. It was dry during the day apart from some haze. A cold front moved across the south China coast last night. The associated intense northeast monsoon will bring cool weather to southern China today and tomorrow.

Besides, Tropical Storm Kalmaegi intensified into a severe tropical storm yesterday. At 11 p.m. last night, Kalmaegi was centred about 510 kilometres north-northeast of Manila. It is forecast to move west at about 10 kilometres per hour towards the vicinity of Luzon Strait.

Weather forecast for Hong Kong (Tuesday, 19 Nov 2019)

Mainly fine and dry. Cool in the morning with a minimum temperature of around 17 degrees in the urban areas, and a couple of degrees lower in the New Territories. The maximum temperature will be about 23 degrees during the day. Moderate to fresh northerly winds, occasionally strong offshore.

Outlook : Dry with sunny periods in the following couple of days. Cooler on Wednesday morning.


(The above forecast period is valid up to 23:59 HKT today, 19/11/2019; 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 18/Nov/2019

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

GENERAL SITUATION AT 180900 UTC:
COLD FRONT 21N 109E 24N 118E 25N 125E S SLOWLY FOR DETAILS ON SEVERE TROPICAL STORM KALMAEGI (1926), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 181300 UTC:

HONG KONG= N TO NE 6-7. FINE. SEA 3-4 M. SWELL NE UP TO 2 M. TEMP 17-23 C. =
KWANGTUNG= N TO NE 6-7, UP TO 8 IN E. FINE. SEA 3-4 M, UP TO 6 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 8-9. CLD. SEA 6-8 M. SWELL NE 3-5 M. =
BASHI= NE 7-8, OCNL 9. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL E TO NE 3-5 M. =
PRATAS= NE 6-7, UP TO 8 LATER. ISOL SHOWERS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2-3 M. =
BALINTANG= CYCLONIC 9-10, NE 9-10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= NE 7-8, CYCLONIC 9-10 LATER. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 8-10 M LATER. SWELL NE 3-5 M. =
PARACEL= NE 6-7. ISOL SHOWERS. SEA 3-4 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 4-5, OCNL 6. CLD. SEA UP TO 3 M. =
DANANG= NE 5-6. CLD. SEA 2-3 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 23:30 HKT 18/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.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 intense northeast monsoon associated with a cold front is affecting the coastal waters of Guangdong.

    At 11 p.m., Severe Tropical Storm Kalmaegi with maximum sustained winds of about 105 kilometres per hour near its centre was located at 18.9 degrees north, 122.6 degrees east. It is forecast to move west at about 10 kilometres per hour towards the vicinity of Luzon Strait.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 6 to 7.
    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 to northeast force 6 to 7.
    Rough seas.

    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 5
      Visibility 20 Kilometres

    Shantou Wind east force 2
      Visibility 15 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 4

    Xisha Wind north-northeast force 2
      Visibility 24 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 18/NOV/2019
    (Next update at 01:30 HKT 19/NOV/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A COLD FRONT IS MOVING ACROSS THE COASTAL AREAS
     OF GUANGDONG. THE ASSOCIATED INTENSE NORTHEAST
     MONSOON WILL AFFECT THE REGION GRADUALLY.
     TROPICAL STORM KALMAEGI HAS INTENSIFIED INTO A
     SEVERE TROPICAL STORM. 
     AT 4 P.M., KALMAEGI WAS CENTRED AT 18.3 DEGREES
     NORTH, 123.1 DEGREES EAST. IT IS FORECAST TO
     MOVE NORTHWEST AT ABOUT 5 KNOT TOWARDS LUZON.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15G25
       OFFSHORE:  360/20-25                            26-16
   B.   2000 FT:  360/20-25                            21
   C.   5000 FT:  010/15                               18
   D.  10000 FT:  040/20                               6
   E.  18000 FT:  260/25                               MS2
   F.  24000 FT:  290/30                               MS15
   G.  30000 FT:  280/35                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 7 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 8400, 11200, 13200 FT
   M. TURBULENCE    : MOD TO SEV AT LOW LEVELS.
   N. SEA STATE     : 2.5-3.0 M     SEA TEMPERATURE    : 25 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.

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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 00:30 HKT 19/Nov/2019


    Tropical Cyclone Warning

    At 181500 UTC, Severe Tropical Storm Kalmaegi (1926) with central pressure 980 hectopascals was centred within 60 nautical miles of one eight point nine degrees north (18.9 N) one two two point six degrees east (122.6 E) and is forecast to move west at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 55 knots.

    Radius of over 33 knot winds 120 nautical miles.
    Radius of over 47 knot winds 90 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 191500 UTC
    One seven point five degrees north (17.5 N)
    One two zero point two degrees east (120.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 201500 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 19/Nov/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.4 C
Minimum Air Temperature                     20.6 C
Grass Minimum Temperature                   18.8 C
Relative Humidity                        57 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2359.8 mm

Other Stations                Min                  Max
King's Park                  19.6 C               28.9 C
Wong Chuk Hang               18.7 C               27.9 C
Ta Kwu Ling                  16.1 C               29.8 C
Lau Fau Shan                 18.1 C               28.4 C
Tai Po                       18.8 C               28.7 C
Sha Tin                      18.4 C               29.3 C
Tseung Kwan O                18.6 C               30.4 C
Sai Kung                     19.0 C               27.9 C
Cheung Chau                  19.1 C               30.7 C
Chek Lap Kok                 20.1 C               28.7 C
Tsing Yi                     19.7 C               29.5 C
Shek Kong                    17.8 C               29.7 C
Tsuen Wan Ho Koon            17.9 C               27.3 C
Tsuen Wan Shing Mun Valley   18.3 C               29.6 C
Hong Kong Park               20.2 C               30.1 C
Shau Kei Wan                 19.8 C               29.1 C
Kowloon City                 19.1 C               29.9 C
Happy Valley                 18.8 C               29.9 C
Wong Tai Sin                 19.7 C               30.7 C
Stanley                      19.8 C               28.5 C
Kwun Tong                    19.8 C               28.8 C
Sham Shui Po                 19.4 C               30.9 C
Kai Tak Runway Park          20.5 C               30.1 C
Yuen Long Park               18.4 C               29.9 C
Tai Mei Tuk               18.1 C               30.0 C

Duration of sunshine (King's Park):              9.9 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 (18 Nov 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
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 18 Nov
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