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Bulletin issued at 07:02 HKT 21/Nov/2018

At 7 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 86 per cent.

The air temperatures at other places were:

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

Here is the information on Tropical Depression at 5 a.m.:
Location: 10.9 degrees north, 124.9 degrees east.


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


Climatological Information for 21 Nov

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 06:45 HKT 21/Nov/2018

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

The northeast monsoon is affecting southern China. Meanwhile, pressure over northern China is rising. A replenishment of the monsoon is expected to reach the south China coastal areas tonight.

At 5 a.m., the tropical depression over the central to southern parts of the Philippines was centred about 580 kilometres southeast of Manila. It is forecast to move west at about 20 kilometres per hour across the central to southern parts of the Philippines.

Weather forecast for today

Mainly cloudy. One or two rain patches in the morning and at night. Sunny intervals during the day. The maximum temperature will be about 25 degrees. Relatively low visibility later. Moderate easterly winds, becoming northerlies tonight with temperatures falling to around 21 degrees at midnight.

Outlook : Becoming cool appreciably tomorrow morning. Dry with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 21/11/2018; 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 20/Nov/2018

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

GENERAL SITUATION AT 200900 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. TROPICAL DEPRESSION 1002 HPA 11N 127E W 14KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= E 6-7, N UP TO 8 LATER. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 3-4 M, UP TO 6 M LATER. SWELL E 2 M. TEMP 25-21 C. =
KWANGTUNG= E 6-7, N 7-8 LATER. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 3-4 M, UP TO 6 M LATER. SWELL E TO NE 2 M. =
TAIWAN STRAIT= N TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= NE 7-8. ISOL SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
PRATAS= E 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL E 2 M. =
BALINTANG= E TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
SCARBOROUGH= E TO NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
PARACEL= E 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA 3-4 M. SWELL NE 2 M. =
TONKIN= E TO SE 4-5, N 7-8 LATER. DOWN TO 4000 M IN MIST OR RAIN PATCHES. SEA 2 M, 4-6 M LATER. SWELL E UP TO 2 M. =
DANANG= E 5-6, N 7 LATER. LGT RAIN PATCHES. SEA 2-3 M, 4 M LATER. SWELL E UP TO 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 05:30 HKT 21/Nov/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 21 November 2018

    Warnings:
    Gale force winds in all areas.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters. A replenishment of the monsoon is expected to reach the region tonight.

    At 5 a.m., the tropical depression over the central to southern parts of the Philippines with maximum sustained winds of about 45 kilometres per hour near its centre was located at 10.9 degrees north, 124.9 degrees east. It is forecast to move west at about 20 kilometres per hour across the central to southern parts of the Philippines.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 6 to 7, becoming north up to force 8 later.
    Misty and a few rain patches.
    Rough seas, becoming very rough later.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East force 6 to 7, becoming north force 7 to 8 later.
    Rough seas, becoming very rough later.

    Outlook for the next 48 hours
    Northerly winds of force 7 to 8.

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

    Waglan Island Wind northeast force 5
      Visibility 8 Kilometres

    Shantou Wind east force 1
      Visibility 13 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Macau Wind east force 3
      Visibility 8 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 24 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 21/NOV/2018
    (Next update at 9:00-9:30 HKT 21/NOV/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
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:  080/10-15
       OFFSHORE:  090/15-20 OCNL 25                    22-26
   B.   2000 FT:  120/15-20 OCNL 25                    18
   C.   5000 FT:  170/10                               15
   D.  10000 FT:  250/15                               8
   E.  18000 FT:  270/30                               MS3
   F.  24000 FT:  280/40                               MS16
   G.  30000 FT:  270/45                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY AT FIRST, SUNNY INTERVALS DURING
      THE DAY.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 8000 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-3.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS, BECOMING FRESH
     NORTHERLY WINDS, OCCASIONALLY STRONG OFFSHORE
     LATER. SUNNY INTERVALS AT FIRST, MAINLY CLOUDY
     WITH A FEW RAIN AND MIST PATCHES LATER.=

    ===================================================================
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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    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 21/Nov/2018


    Tropical Cyclone Warning

    The tropical depression over the central to southern parts of the Philippines has entered the area of responsibility of the Hong Kong Observatory.

    At 202100 UTC, the tropical depression with central pressure 1002 hectopascals was centred within 90 nautical miles of one zero point nine degrees north (10.9 N) one two four point four degrees east (124.4 E) and is forecast to move west at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 212100 UTC
    One zero point nine degrees north (10.9 N)
    One one nine point four degrees east (119.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 222100 UTC
    One zero point eight degrees north (10.8 N)
    One one four point five degrees east (114.5 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 232100 UTC
    One zero point eight degrees north (10.8 N)
    One one one point two degrees east (111.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 242100 UTC
    One one point four degrees north (11.4 N)
    One zero nine point zero degrees east (109.0 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 252100 UTC
    One two point nine degrees north (12.9 N)
    One zero seven point six degrees east (107.6 E)
    Maximum winds 25 knots.



    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 21/Nov/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     24.0 C
Minimum Air Temperature                     22.0 C
Grass Minimum Temperature                   21.6 C
Relative Humidity                        74 - 87 Percent
Rainfall                                     0.1 mm 
Total rainfall since 1st January          2087.7 mm
Against an average of                     2361.0 mm

Other Stations                Min                  Max
King's Park                  21.6 C               24.0 C
Wong Chuk Hang               21.4 C               24.7 C
Ta Kwu Ling                  19.4 C               26.5 C
Lau Fau Shan                 19.9 C               29.6 C
Tai Po                       20.2 C               23.0 C
Sha Tin                      20.8 C               24.0 C
Tuen Mun                     21.7 C               25.4 C
Tseung Kwan O                21.2 C               23.6 C
Sai Kung                     21.8 C               23.4 C
Cheung Chau                  21.6 C               25.0 C
Chek Lap Kok                 22.2 C               26.4 C
Tsing Yi                     22.3 C               25.5 C
Shek Kong                    21.2 C               26.6 C
Tsuen Wan Ho Koon            20.7 C               25.3 C
Tsuen Wan Shing Mun Valley   21.6 C               25.6 C
Hong Kong Park               21.5 C               24.5 C
Shau Kei Wan                 21.0 C               23.0 C
Kowloon City                 21.4 C               25.3 C
Happy Valley                 21.6 C               25.4 C
Wong Tai Sin                 21.5 C               24.7 C
Stanley                      21.2 C               23.5 C
Kwun Tong                    21.0 C               23.9 C
Sham Shui Po                 22.1 C               25.7 C
Kai Tak Runway Park          21.8 C               23.6 C
Tai Mei Tuk               20.5 C               24.1 C

Duration of sunshine (King's Park):              2.9 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.
 

Yesterday's (20 Nov 2018) 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                               0.10
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                         0.15
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 20 Nov
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