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Bulletin issued at 18:02 HKT 24/Nov/2018

At 6 p.m. at the Hong Kong Observatory the air temperature was 21 degrees Celsius and the relative humidity 74 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.0. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 21 degrees;
Lau Fau Shan 21 degrees;
Tai Po 20 degrees;
Sha Tin 21 degrees;
Tuen Mun 21 degrees;
Tseung Kwan O 19 degrees;
Sai Kung 21 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 22 degrees;
Tsuen Wan Ho Koon 19 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 21 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 20 degrees;
Happy Valley 21 degrees;
Wong Tai Sin 21 degrees;
Stanley 21 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 21 degrees;
Kai Tak Runway Park 22 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 20 degrees.

Here is the information on Severe Tropical Storm Usagi at 4 p.m.:
Location: 9.8 degrees north, 108.6 degrees east.


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


Climatological Information for 24 Nov

Regional Weather in Hong Kong

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Bulletin updated at 17:45 HKT 24/Nov/2018

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

The northeast monsoon is bringing mainly fine weather to Guangdong.

At 4 p.m., Severe Tropical Storm Usagi was centred about 240 kilometres east-southeast of Ho Chi Minh City. It is forecast to move west or west-northwest at about 10 kilometres per hour towards the southern part of Vietnam. Meanwhile, Typhoon Man-yi was centred about 920 kilometres southwest of Iwo Jima. It is forecast to move slowly across the western North Pacific.

Weather forecast for tonight and tomorrow

Mainly fine at first. Becoming cloudy with rain later tomorrow. Temperatures will range between 20 and 23 degrees. Moderate easterly winds, becoming northeasterlies tomorrow.

Outlook : Cloudy with a few rain patches in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 25/11/2018; 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 09:00 HKT 24/Nov/2018

GALE WARNING AREAS: TAIWAN STRAIT, BASHI, BALINTANG, SCARBOROUGH, PARACEL AND DANANG.

GENERAL SITUATION AT 232100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON TROPICAL STORM USAGI (1829), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 240100 UTC:

HONG KONG= E TO NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE 2-3 M. TEMP 24-20 C. =
KWANGTUNG= E TO NE 6-7. FINE. RAIN PATCHES LATER. SEA 3-4 M. SWELL NE 2-3 M. =
TAIWAN STRAIT= NE 7-8. FINE. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= E TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
PRATAS= E TO NE 6-7. FINE. RAIN PATCHES LATER. SEA 3-4 M. SWELL NE 2-3 M. =
BALINTANG= E TO NE 7-8. LGT RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
SCARBOROUGH= NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3 M. =
PARACEL= NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 2-3 M. =
TONKIN= NE 6-7. ISOL SHOWERS LATER. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NE 7-8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 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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    Bulletin issued at 16:30 HKT 24/Nov/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 24 November 2018

    Warnings:
    Strong winds in all areas.

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

    At 4 p.m., Severe Tropical Storm Usagi with maximum sustained winds of about 90 kilometres per hour near its centre was located at 9.8 degrees north, 108.6 degrees east. It is forecast to move west or west-northwest at about 10 kilometres per hour towards the southern part of Vietnam.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 5 to 6, occasionally force 7.
    A few rain patches tomorrow.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    East to northeast force 6 to 7.
    Isolated squally showers and thunderstorms later tomorrow.
    Rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 6 to 7. Isolated squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 3
      Visibility 17 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 2
      Visibility 11 Kilometres

    Xisha Wind east-northeast force 4
      Visibility 13 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 24/NOV/2018
    (Next update at 01:30 HKT 25/NOV/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     AT 4 P.M., SEVERE TROPICAL STORM USAGI WAS
     CENTRED NEAR 9.8 DEGREES NORTH, 108.6 DEGREES
     EAST.  IT IS FORECAST TO MOVE WEST OR
     WEST-NORTHWEST AT ABOUT 5 KNOTS TOWARDS 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:  090/10
                  BECMG 040/10
       OFFSHORE:  090/15-20
                  BECMG 040/15-20                      23-20
   B.   2000 FT:  040/10-15 OCNL 20 LATER              16
   C.   5000 FT:  340/10                               14
   D.  10000 FT:  200/20                               8
   E.  18000 FT:  260/35                               MS3
   F.  24000 FT:  260/35                               MS15
   G.  30000 FT:  270/55                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3500-4300 FT
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT.
   K. VISIBILITY    : 9 KM.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 7000 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS, FRESH AT
     TIMES. MAINLY FINE AT FIRST. BECOMING CLOUDY
     WITH RAIN 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.

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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 18:30 HKT 24/Nov/2018


    Tropical Cyclone Warning

    At 240900 UTC, Severe Tropical Storm Usagi (1829) with central pressure 984 hectopascals was centred within 60 nautical miles of nine point eight degrees north (9.8 N) one zero eight point five degrees east (108.5 E) and is forecast to move west or west-northwest at about 5 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 50 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 250900 UTC
    One zero point six degrees north (10.6 N)
    One zero seven point zero degrees east (107.0 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 260900 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 24/Nov/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     23.4 C
Minimum Air Temperature                     18.1 C
Grass Minimum Temperature                   16.4 C
Relative Humidity                        53 - 76 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2090.3 mm
Against an average of                     2365.1 mm

Other Stations                Min                  Max
King's Park                  17.2 C               24.4 C
Wong Chuk Hang               17.4 C               24.4 C
Ta Kwu Ling                  13.7 C               24.7 C
Lau Fau Shan                 16.0 C               24.0 C
Tai Po                       15.4 C               23.3 C
Sha Tin                      15.5 C               24.2 C
Tuen Mun                     17.8 C               25.2 C
Tseung Kwan O                15.2 C               25.3 C
Sai Kung                     17.3 C               23.3 C
Cheung Chau                  16.7 C               26.6 C
Chek Lap Kok                 18.8 C               23.7 C
Tsing Yi                     17.3 C               24.6 C
Shek Kong                    15.7 C               25.3 C
Tsuen Wan Ho Koon            15.3 C               23.4 C
Tsuen Wan Shing Mun Valley   16.9 C               26.5 C
Hong Kong Park               17.7 C               24.5 C
Shau Kei Wan                 17.1 C               25.0 C
Kowloon City                 17.1 C               26.3 C
Happy Valley                 17.3 C               25.3 C
Wong Tai Sin                 17.3 C               26.5 C
Stanley                      18.1 C               23.6 C
Kwun Tong                    16.7 C               25.4 C
Sham Shui Po                 17.1 C               26.3 C
Kai Tak Runway Park          17.3 C               25.6 C
Yuen Long Park               16.7 C               25.5 C
Tai Mei Tuk               15.9 C               25.7 C

Duration of sunshine (King's Park):              9.3 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 (23 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 23 Nov
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