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Bulletin issued at 10:02 HKT 15/Aug/2018

At 10 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 87 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 28 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 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 28 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 28 degrees.

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

North District 0 to 4 mm;
Central & Western District 0 to 1 mm;
Islands District 0 to 1 mm;
Southern District 0 to 1 mm.

Here is the information on Severe Tropical Storm Bebinca at 10 a.m.:
Location: 20.8 degrees north, 111.9 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

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Hong Kong Climatology


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Bulletin updated at 09:45 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. The area of low pressure near the Ryukyu Islands is intensifying. A tropical cyclone appears to be forming.

At 10 a.m., Severe Tropical Storm Bebinca was centred about 160 kilometres east-southeast of Zhanjiang. It is forecast to move west at about 10 kilometres per hour skirting the coastal waters of western Guangdong, generally towards the vicinity of Leizhou Peninsula. Tropical Storm Leepi has weakened into a tropical depression. At 10 a.m., Leepi was centred about 160 kilometres north of Nagasaki. It is forecast to move north-northwest at about 25 kilometres per hour towards the southern part of Korean Peninsula.

Weather forecast for today

Mainly cloudy with occasional showers. Moderate southeasterly winds, occasionally fresh at first. There will be swells.

Outlook : There will still be showers in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 15/08/2018; 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 09:00 HKT 15/Aug/2018

STORM WARNING AREAS: KWANGTUNG, PARACEL AND TONKIN.
GALE WARNING AREAS: BASHI, BALINTANG AND SCARBOROUGH.

GENERAL SITUATION AT 142100 UTC:
FOR DETAILS ON TROPICAL STORM BEBINCA (1816), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 150100 UTC:

HONG KONG= E TO SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. TEMP 31-27 C. =
KWANGTUNG= S TO SW 7-8, CYCLONIC 9-10 IN W. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 8-10 M IN W. SWELL S TO SW 3 M. =
TAIWAN STRAIT= S 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 3 M. =
BASHI= SW 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3 M. =
PRATAS= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
BALINTANG= SW 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 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 8-9, OCNL 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL SW 3-4 M. =
TONKIN= W TO SW 6-7, UP TO 10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 10 M LATER. SWELL S TO SW 2-3 M. =
DANANG= SW 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 09:30 HKT 15/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 15 August 2018

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

    Weather Situation:
    Tropical Storm Bebinca has intensified into a severe tropical storm. At 9 a.m., Bebinca with maximum sustained winds of about 90 kilometres per hour near its centre was located near 20.8 degrees north, 111.9 degrees east. It is forecast to move west at about 10 kilometres per hour skirting the coastal waters of western Guangdong, generally towards the vicinity of Leizhou Peninsula. The area of low pressure near the Ryukyu Islands is intensifying. A tropical cyclone appears to be forming.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Nan'ao:
    South force 5 to 6.
    Occasional squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    South force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong:
    South to southwest force 7 to 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Cyclonic force 9 to 10, becoming southwest force 9 to 10.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Outlook for the next 48 hours
    Southerly winds of force 5 to 6, up to force 8 in west. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 4
      Visibility 16 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Huangmaozhou Wind south-southeast force 5

    Macau Wind south-southeast force 2
      Visibility 13 Kilometres

    Xisha Wind southwest force 5
      Visibility 9 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 09:30 HKT 15/AUG/2018
    (Next update at 12:30 HKT 15/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL STORM BEBINCA HAS INTENSIFIED INTO A
     SEVERE TROPICAL STORM. 
     AT 9 A.M., BEBINCA WAS CENTRED NEAR 20.8 DEGREES
     NORTH 111.9 DEGREES EAST.  IT IS FORECAST TO
     MOVE WEST AT ABOUT 5 KNOTS SKIRTING THE COASTAL
     WATERS OF WESTERN GUANGDONG, GENERALLY TOWARDS
     THE VICINITY OF LEIZHOU PENINSULA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/10-15
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  120/20-25                            27-31
   B.   2000 FT:  120/20-25 OCNL 30                    23
   C.   5000 FT:  140/20                               18
   D.  10000 FT:  130/20                               12
   E.  18000 FT:  130/15                               1
   F.  24000 FT:  140/15                               MS9
   G.  30000 FT:  090/15                               MS22
   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: 
     FRESH TO STRONG 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 09:39 HKT on 15 Aug 18

    VHHK SIGMET 1 VALID 150139/150600 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2048 E11154 CB OBS AT 0000Z WI 150NM OF TC CENTRE TOP FL520 NC FCST AT 0600Z TC CENTRE PSN N2048 E11130= VHHK SIGMET 15 VALID 142230/150300 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2100 E11236 CB OBS AT 2100Z WI 150NM OF TC CENTRE TOP FL520 NC FCST AT 0300Z TC CENTRE PSN N2054 E11200=

    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 09:30 HKT 15/Aug/2018


    Tropical Cyclone Warning

    Tropical Storm Bebinca (1816) has intensified into a Severe Tropical Storm with central pressure 980 hectopascals. At 150000 UTC, it was centred within 60 nautical miles of two zero point eight degrees north (20.8 N) one one one point nine degrees east (111.9 E) and is forecast to move west 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 160000 UTC
    Two zero point four degrees north (20.4 N)
    One one zero point two degrees east (110.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 170000 UTC
    Two zero point zero degrees north (20.0 N)
    One zero six point eight degrees east (106.8 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 180000 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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