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Bulletin issued at 21:02 HKT 19/Nov/2017

At 9 p.m. at the Hong Kong Observatory the air temperature was 20 degrees Celsius and the relative humidity 78 per cent.

The air temperatures at other places were:

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

Here is the information on Tropical Depression Kirogi at 8 p.m.:
Location: 11.3 degrees north, 107.8 degrees east.


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


Climatological Information for 19 Nov

Regional Weather in Hong Kong

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Bulletin updated at 21:30 HKT 19/Nov/2017

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

The northeast monsoon is bringing cooler weather to Guangdong.

Besides, Tropical Depression Kirogi has weakened into an area of low pressure over the southern part of Vietnam.

Weather forecast for tonight and tomorrow

Mainly cloudy. Temperatures will linger around 20 degrees at first. It will be cool tomorrow night and temperatures will fall to about 17 degrees. Moderate to fresh north to northeasterly winds.

Outlook : Cool in the morning and at night in the following few days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 20/11/2017; 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 19/Nov/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, PRATAS, BALINTANG, SCARBOROUGH, PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 190900 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL DEPRESSION KIROGI (1725), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 191300 UTC:

HONG KONG= N TO NE 6-7, OCNL 8. FINE. SEA UP TO 6 M. SWELL NE 2-3 M. TEMP 20-17 C. =
KWANGTUNG= N TO NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3 M. =
TAIWAN STRAIT= N TO NE 7-8, OCNL 9. RAIN PATCHES. SEA UP TO 8 M. SWELL NE 3-5 M. =
BASHI= NE 7-8, OCNL 9. RAIN PATCHES. SEA UP TO 8 M. SWELL NE 3-5 M. =
PRATAS= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 3-5 M. =
BALINTANG= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
SCARBOROUGH= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
PARACEL= N TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-5 M. =
TONKIN= N TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
DANANG= N TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 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 19:30 HKT 19/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 19 November 2017

    Warnings:
    Gale force winds in all areas.

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

    At 7 p.m., Tropical Depression Kirogi with maximum sustained winds of about 45 kilometres per hour near its centre was located near 11.3 degrees north, 108.2 degrees east. It is forecast to move west at about 18 kilometres per hour into the inland areas of Vietnam and dissipate gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    North to northeast force 7 to 8.
    Rough to very rough seas.

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

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

    Waglan Island Wind northeast force 4
      Visibility 17 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 6

    Macau Wind north-northeast force 3
      Visibility 6 Kilometres

    Xisha Wind east-northeast force 3
      Visibility 16 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 17:30 HKT 19/NOV/2017
    (Next update at 01:30 HKT 20/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A NORTHEAST MONSOON IS BRINGING COOLER WEATHER
     TO THE COAST OF GUANGDONG. AT 4 P.M., TROPICAL
     DEPRESSION KIROGI WAS LOCATED NEAR 11.1 DEGREES
     NORTH, 108.8 DEGREES EAST. IT IS FORECAST TO
     MOVE WEST AT ABOUT 10 KNOTS IN THE GENERAL
     DIRECTION OF THE SOUTHERN PART OF VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  050/10-15
       OFFSHORE:  070/20-25 OCNL 30                    21-17
   B.   2000 FT:  080/15-20                            14
   C.   5000 FT:  140/15                               15
   D.  10000 FT:  260/15                               7
   E.  18000 FT:  260/25                               MS5
   F.  24000 FT:  260/30                               MS15
   G.  30000 FT:  260/35                               MS31
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4500-5000 FT
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW RAIN PATCHES.
      LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2000 FT BKN 4000 FT
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN RAIN/MIST.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 9200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS,
     STRONG OFFSHORE. CLOUDY WITH A FEW RAIN PATCHES.=

    ===================================================================
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.

    The latest significant weather information
    issued by the Hong Kong Observatory at 10:00 HKT on 15 Nov 17

    VHHK SIGMET Z99 VALID 150200/150210 VHHH- VHHK HONG KONG FIR THIS IS A TEST SIGMET, PLEASE DISREGARD=

    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 21:30 HKT 19/Nov/2017


    Tropical Cyclone Warning

    At 191200 UTC, Tropical Depression Kirogi (1725) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    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/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.5 C
Minimum Air Temperature                     20.1 C
Grass Minimum Temperature                   21.3 C
Relative Humidity                        68 - 94 Percent
Rainfall                                     1.9 mm 
Total rainfall since 1st January          2570.8 mm
Against an average of                     2359.8 mm

Other Stations                Min                  Max
King's Park                  19.6 C               26.9 C
Wong Chuk Hang               20.6 C               27.9 C
Ta Kwu Ling                  18.7 C               26.3 C
Lau Fau Shan                 19.5 C               26.2 C
Tai Po                       19.6 C               26.3 C
Sha Tin                      19.2 C               26.7 C
Tuen Mun                     20.3 C               26.7 C
Tseung Kwan O                19.1 C               27.0 C
Sai Kung                     19.2 C               26.3 C
Cheung Chau                  20.2 C               27.5 C
Chek Lap Kok                 20.5 C               28.0 C
Tsing Yi                     20.2 C               27.5 C
Shek Kong                    19.0 C               26.6 C
Tsuen Wan Ho Koon            19.9 C               25.1 C
Tsuen Wan Shing Mun Valley   19.9 C               27.1 C
Hong Kong Park               19.6 C               27.0 C
Shau Kei Wan                 19.2 C               27.7 C
Kowloon City                 19.0 C               27.1 C
Happy Valley                 20.0 C               28.7 C
Wong Tai Sin                 19.4 C               27.2 C
Stanley                      20.0 C               27.6 C
Kwun Tong                    18.8 C               27.7 C
Sham Shui Po                 19.5 C               27.3 C
Kai Tak Runway Park          20.0 C               27.7 C
Yuen Long Park               19.4 C               27.3 C
Tai Mei Tuk               19.2 C               26.5 C

Duration of sunshine (King's Park):              3.2 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 4.
Sea surface temperature (Waglan Island):        23.6 C 

Yesterday's (18 Nov 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.15

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 18 Nov
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