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Bulletin issued at 01:02 HKT 12/Nov/2019

At 1 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 74 per cent.

The air temperatures at other places were:

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


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


Climatological Information for 12 Nov

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Bulletin updated at 00:45 HKT 12/Nov/2019

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

A dry northeast monsoon continued to bring fine weather to southern China yesterday. Locally, it was fine and dry during the day. The relative humidity over the territory fell to 60 per cent or below. With the monsoon moderating slightly today and tomorrow, temperatures over the coast of Guangdong will rise slightly.

Besides, Tropical Cyclone Nakri weakened into an area of low pressure over the central part of Vietnam yesterday morning.

Weather forecast for Hong Kong

Mainly cloudy in the morning and at night. The minimum temperature will be about 22 degrees in the urban areas, and a couple of degrees lower in the New Territories. Sunny periods during the day with a maximum temperature of around 26 degrees. Moderate easterly winds, fresh at times.

Outlook : Northerlies will strengthen on Wednesday night. Fine and dry in the following few days. It will be cooler in the morning and at night.


(The above forecast period is valid up to 23:59 HKT today, 12/11/2019; 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 11/Nov/2019

N0 WARNING.

GENERAL SITUATION AT 110900 UTC:
THE NORTHEAST MONSOON IS GENERALLY AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= E 4-5, OCNL 6. FINE. SEA UP TO 3 M. TEMP 22-26 C. =
KWANGTUNG= E TO NE 4-5, OCNL 6. FINE. SEA UP TO 3 M. =
TAIWAN STRAIT= NE 5-6. RAIN PATCHES. SEA 2-3 M. =
BASHI= E TO NE 5-6, OCNL 7. ISOL SHOWERS. SEA UP TO 4 M. SWELL NE 2 M. =
PRATAS= E TO NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 2 M. =
BALINTANG= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. =
SCARBOROUGH= E TO NE 5-6. ISOL SHOWERS AND SQUALLY TS. SEA 2-3 M. SWELL NE 2 M. =
PARACEL= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL SW 2-3 M. =
TONKIN= NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= E 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL SW 2-3 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 11/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 11 November 2019

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East to northeast force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    Shangchuan Dao:
    East force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 4 to 5, becoming northerly winds of force 6 to 7 later, up to force 8 in east.

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

    Waglan Island Wind east force 5
      Visibility 27 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 22 Kilometres

    Dongsha Wind east-northeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 3
      Visibility 11 Kilometres

    Xisha Wind east force 3
      Visibility 14 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 01:30 HKT 12/NOV/2019
    (Next update at 9:00-9:30 HKT 12/NOV/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10-15
       OFFSHORE:  100/15-20, OCNL 25                   22-27
   B.   2000 FT:  100/20-25, OCNL 30                   18
   C.   5000 FT:  120/20                               18
   D.  10000 FT:  330/10                               11
   E.  18000 FT:  240/15                               MS1
   F.  24000 FT:  260/20                               MS14
   G.  30000 FT:  240/30                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4200-4700 FT
   I. WEATHER       : 
      MAINLY CLOUDY. SUNNY PERIODS DURING THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV NEAR HILLS. MOD OFFSHORE.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, FRESH AT TIMES. SUNNY
     PERIODS DURING THE DAY. MAINLY CLOUDY AT NIGHT.=

    ===================================================================
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)

    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

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    Bulletin issued at 06:30 HKT 11/Nov/2019


    Tropical Cyclone Warning

    Tropical Storm Nakri (1924) has weakened into a Tropical Depression with central pressure 998 hectopascals. At 102100 UTC, it was centred within 90 nautical miles of one two point eight degrees north (12.8 N) one zero eight point nine degrees east (108.9 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 30 knots.

    Radius of over 2 metre waves 180 nautical miles.

    No further warnings on this Tropical Depression will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 112100 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 12/Nov/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.8 C
Minimum Air Temperature                     20.9 C
Grass Minimum Temperature                   18.3 C
Relative Humidity                        55 - 82 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2349.5 mm

Other Stations                Min                  Max
King's Park                  19.3 C               26.5 C
Wong Chuk Hang               17.4 C               26.7 C
Ta Kwu Ling                  14.1 C               28.1 C
Lau Fau Shan                 17.8 C               27.2 C
Tai Po                       17.5 C               25.7 C
Sha Tin                      16.5 C               27.2 C
Tseung Kwan O                17.4 C               26.5 C
Sai Kung                     18.5 C               25.7 C
Cheung Chau                  18.4 C               28.8 C
Chek Lap Kok                 19.7 C               28.2 C
Tsing Yi                     18.1 C               28.8 C
Shek Kong                    15.4 C               28.0 C
Tsuen Wan Ho Koon            16.6 C               27.4 C
Tsuen Wan Shing Mun Valley   16.2 C               28.4 C
Hong Kong Park               19.2 C               27.1 C
Shau Kei Wan                 19.4 C               25.8 C
Kowloon City                 19.2 C               28.0 C
Happy Valley                 18.0 C               26.7 C
Wong Tai Sin                 18.2 C               26.7 C
Stanley                      19.9 C               24.8 C
Kwun Tong                    19.6 C               26.2 C
Sham Shui Po                 19.0 C               28.8 C
Kai Tak Runway Park          21.1 C               25.6 C
Yuen Long Park               16.0 C               29.3 C
Tai Mei Tuk               18.7 C               27.9 C

Duration of sunshine (King's Park):              10.2 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 (11 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                          0.09
King's Park                         0.14
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 11 Nov
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