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Bulletin issued at 22:02 HKT 15/Aug/2018

At 10 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 85 per cent.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 26 degrees;
Tai Po 28 degrees;
Sha Tin 28 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 28 degrees;
Stanley 28 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 28 degrees;
Tai Mei Tuk 27 degrees.

Between 8:45 and 9:45 p.m., the rainfall recorded in various regions were:

Sha Tin 0 to 1 mm.

Here is the information on Severe Tropical Storm Bebinca at 8 p.m.:
Location: 20.9 degrees north, 110.8 degrees east.


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


Climatological Information for 15 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 21:45 HKT 15/Aug/2018

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

Showers associated with Tropical Cyclone Bebinca are affecting the coast of Guangdong and the northern part of the South China Sea.

At 8 p.m., Severe Tropical Storm Bebinca was centred about 60 kilometres southeast of Zhanjiang. It is forecast to move west-southwest at about 10 kilometres per hour in the general direction of the vicinity of Leizhou Peninsula. Meanwhile, Tropical Storm Rumbia was centred about 580 kilometres east of Hangzhou. It is forecast to move northwest or west-northwest at about 20 kilometres per hour across the East China Sea.

Weather forecast for tonight and tomorrow

Mainly cloudy with occasional showers. Isolated thunderstorms tomorrow. Temperatures will range between 27 and 30 degrees. Moderate south to southeasterly winds.

Outlook : A few showers in the following couple of days. Sunny intervals during the weekend.


(The above forecast period is valid up to 23:59 HKT tomorrow, 16/08/2018; 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 15/Aug/2018

STORM WARNING AREAS: KWANGTUNG AND TONKIN.
GALE WARNING AREAS: SCARBOROUGH AND PARACEL.

GENERAL SITUATION AT 150900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM BEBINCA (1816), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. TROPICAL STORM RUMBIA (1818) 994HPA 29N 126E NW 10 KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 151300 UTC:

HONG KONG= S TO SE 4-5, OCNL 6. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2-3 M. TEMP 27-30 C. =
KWANGTUNG= S TO SW 6-7, CYCLONIC 9-10 IN W AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 8-10 M IN W. SWELL S TO SW 3 M. =
TAIWAN STRAIT= S TO SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
BASHI= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
PRATAS= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3 M. =
BALINTANG= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
SCARBOROUGH= SW 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3-4 M. =
PARACEL= SW 7-8, 9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 8 M AT FIRST. SWELL SW 3-4 M. =
TONKIN= W TO NW 6-7, CYCLONIC 9-10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 8-10 M LATER. SWELL S TO SW 2-3 M. =
DANANG= W 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO 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 19:30 HKT 15/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 15 August 2018

    Warnings:
    Storm force winds in Shangchuan Dao. Strong winds in Hong Kong adjacent waters, Nan'ao, Shanwei and south of Hong Kong.

    Weather Situation:
    At 7 p.m., Severe Tropical Storm Bebinca with maximum sustained winds of about 90 kilometres per hour near its centre was located at 20.9 degrees north, 110.9 degrees east. It is forecast to move west-southwest at about 10 kilometres per hour generally towards the vicinity of Leizhou Peninsula. Meanwhile, Tropical Storm Rumbia with maximum sustained winds of about 65 kilometres per hour near its centre was located at 29.1 degrees north, 126.1 degrees east. It is forecast to move northwest or west-northwest at about 20 kilometres per hour across the East China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 4 to 5, occasionally force 6.
    Occasional squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    South force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    South to southwest force 5 to 6, occasionally force 7.
    Occasional squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    South to southwest force 8 to 9, force 10 at first.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Outlook for the next 48 hours
    Southerly winds of force 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 3
      Visibility 28 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Macau Wind east force 2
      Visibility 16 Kilometres

    Xisha Wind southwest force 4
      Visibility 8 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 15/AUG/2018
    (Next update at 01:30 HKT 16/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. ISOL CUNIM/TS AND
     ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ASSOCIATED WITH TROPICAL CYCLONE BEBINCA
     ARE AFFECTING THE COAST OF GUANGDONG AND THE
     NORTHERN PART OF THE SOUTH CHINA SEA.
     AT 4 P.M., SEVERE TROPICAL STORM BEBINCA WAS
     CENTRED NEAR 21.0 DEGREES NORTH, 111.3 DEGREES
     EAST AND IS FORECAST TO MOVE WEST AT ABOUT 5
     KNOTS GENERALLY TOWARDS THE VICINITY OF LEIZHOU
     PENINSULA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  120/20-25                            30-27
   B.   2000 FT:  140/20-25                            23
   C.   5000 FT:  150/20                               19
   D.  10000 FT:  140/20                               12
   E.  18000 FT:  150/15                               1
   F.  24000 FT:  160/15                               MS10
   G.  30000 FT:  140/15                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL SQUALLY SHOWERS
      AND ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT.  
      TEMPO FEW CB 800 FT SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 18500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTH TO SOUTHEASTERLY WINDS.
     MAINLY CLOUDY WITH OCCASIONAL SHOWERS AND
     ISOLATED THUNDERSTORMS.=

    ===================================================================
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 19:00 HKT on 15 Aug 18

    VHHK SIGMET 5 VALID 150700/151100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1906 E11248 - N1906 E11154 - N1930 E11130 - N2130 E11130 - N2206 E11254 - N1906 E11248 TOP FL450 MOV W 10KT NC= = VHHK SIGMET 6 VALID 151100/151500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1906 E11248 - N1906 E11154 - N1930 E11130 - N2130 E11130 - N2206 E11254 - N1906 E11248 TOP FL450 MOV W 10KT NC=

    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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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 15/Aug/2018


    Tropical Cyclone Warning

    At 151200 UTC, Severe Tropical Storm Bebinca (1816) with central pressure 980 hectopascals was centred within 60 nautical miles of two zero point nine degrees north (20.9 N) one one zero point eight degrees east (110.8 E) and is forecast to move west-southwest 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 over southern semicircle, 90 nautical miles elsewhere.

    Forecast position and intensity at 161200 UTC
    Two zero point five degrees north (20.5 N)
    One zero eight point nine degrees east (108.9 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 171200 UTC
    Two zero point zero degrees north (20.0 N)
    One zero five point four degrees east (105.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 181200 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 15/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.9 C
Minimum Air Temperature                     26.4 C
Grass Minimum Temperature                   25.8 C
Relative Humidity                        80 - 97 Percent
Rainfall                                    32.9 mm 
Total rainfall since 1st January          1141.4 mm
Against an average of                     1665.1 mm

Other Stations                Min                  Max
King's Park                  26.1 C               30.2 C
Wong Chuk Hang               25.8 C               29.8 C
Ta Kwu Ling                  26.0 C               30.9 C
Lau Fau Shan                 25.6 C               30.2 C
Tai Po                       26.1 C               28.7 C
Sha Tin                      26.4 C               29.9 C
Tuen Mun                     26.0 C               29.8 C
Tseung Kwan O                25.8 C               29.8 C
Sai Kung                     26.5 C               29.9 C
Cheung Chau                  25.6 C               28.2 C
Chek Lap Kok                 26.5 C               31.9 C
Tsing Yi                     26.5 C               30.2 C
Tsuen Wan Ho Koon            25.1 C               28.4 C
Tsuen Wan Shing Mun Valley   25.9 C               29.5 C
Hong Kong Park               25.8 C               29.6 C
Shau Kei Wan                 25.6 C               29.5 C
Kowloon City                 25.9 C               30.2 C
Happy Valley                 26.4 C               30.7 C
Wong Tai Sin                 26.3 C               30.3 C
Stanley                      25.9 C               29.6 C
Kwun Tong                    26.0 C               29.7 C
Sham Shui Po                 26.4 C               31.2 C
Kai Tak Runway Park          26.3 C               29.6 C
Yuen Long Park               26.0 C               30.8 C
Tai Mei Tuk               25.9 C               29.4 C

Duration of sunshine (King's Park):              2.5 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 11.
 

Yesterday's (14 Aug 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 to
0.14 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                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

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 14 Aug
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