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Bulletin issued at 23:02 HKT 13/Aug/2018

At 11 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 83 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 28 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Tsuen Wan Ho Koon 27 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 28 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.

Here is the information on Tropical Storm Bebinca:
Location: 20.6 degrees north, 113.3 degrees east; Maximum sustained wind near its centre: 85 km/h.


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


Climatological Information for 13 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 23:15 HKT 13/Aug/2018

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

The tropical storm over the northern part of the South China Sea was named Bebinca today, and brought unsettled weather to the region. Locally, it was mainly cloudy with sunny intervals and a few showers. A few millimetres of rainfall were recorded over most parts of the territory. Bebinca is expected to linger around the seas off the coast of western Guangdong tomorrow, bringing heavy squally showers and thunderstorms to the region. It will then move towards the vicinity of Leizhou Peninsula and Beibu Wan. Showers will ease off gradually over the coast of Guangdong in the middle and latter parts of this week.

Weather forecast for Hong Kong (Tuesday, 14 Aug 2018)

Mainly cloudy with a few squally showers and thunderstorms. Showers will be heavier at times. Temperatures will range between 26 and 30 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground. There will be rough seas and swells.

Outlook : There will still be squally showers and thunderstorms on Wednesday. Showers will ease off in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 14/08/2018; 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 13/Aug/2018

STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREA: PARACEL.

GENERAL SITUATION AT 130900 UTC:
FOR DETAILS ON TROPICAL STORM BEBINCA (1816), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 131300 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 1000 M IN HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. TEMP 26-30 C. =
KWANGTUNG= CYCLONIC 8-9, BEC UP TO 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 10 M. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S TO SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 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 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 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 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3-4 M. =
PARACEL= SW 6-7, 8-9 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M IN N. SWELL SW 3-4 M. =
TONKIN= W TO SW 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
DANANG= W TO SW 6-7. DOWN TO 2000 M IN SCT 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 23:30 HKT 13/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 13 August 2018

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

    Weather Situation:
    At 11 p.m., Tropical Storm Bebinca with maximum sustained winds of about 85 kilometres per hour near its centre was located near 20.6 degrees north, 113.3 degrees east. It is forecast to move slowly, lingering around the seas off the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, occasionally force 7.
    Heavy squally showers and thunderstorms.
    Rough seas.

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

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

    South of Hong Kong:
    Cyclonic force 8 to 9, becoming south up to force 10.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shangchuan Dao:
    West to southwest force 8 to 9, becoming cyclonic up to force 10.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Outlook for the next 48 hours
    Southerly winds of force 6 to 7, cyclonic winds of force 9 to 10 in west. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 17 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 5

    Macau Wind east force 3
      Visibility 23 Kilometres

    Xisha Wind west force 4
      Visibility 11 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 13/AUG/2018
    (Next update at 01:30 HKT 14/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 :
     AT 5 P.M., TROPICAL STORM BEBINCA WAS CENTRED
     NEAR 20.6 DEGREES NORTH 113.3 DEGREES EAST AND
     IS FORECAST TO MOVE SLOWLY, LINGERING AROUND THE
     SEAS OFF THE COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/15-20
                  TEMPO 100/20G30 IN TS
       OFFSHORE:  110/20-25, OCNL 30                   31-26
   B.   2000 FT:  100/20-25, OCNL 30                   23
   C.   5000 FT:  100/25                               20
   D.  10000 FT:  100/25                               12
   E.  18000 FT:  100/20                               0
   F.  24000 FT:  090/20                               MS10
   G.  30000 FT:  090/30                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      3800 - 4000 FT.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS AND SQUALLY
      THUNDERSTORMS.  SHOWERS WILL BE HEAVIER AT
      TIMES LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 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: 18000 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 EAST TO SOUTHEASTERLY WINDS, STRONG
     OFFSHORE AND ON HIGH GROUND.  CLOUDY WITH
     OCCASIONAL SHOWERS AND SQUALLY THUNDERSTORMS.
     SHOWERS WILL BE HEAVIER AT TIMES.=

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

    sigmet
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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 21:25 HKT on 13 Aug 18

    VHHK SIGMET 7 VALID 131022/131500 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2036 E11318 CB OBS AT 0900Z WI 240NM OF TC CENTRE TOP FL500 NC FCST AT 1500Z TC CENTRE PSN N2042 E11330= VHHK SIGMET 9 VALID 131325/131800 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2036 E11318 CB OBS AT 1200Z WI 180NM OF TC CENTRE TOP FL500 NC FCST AT 1800Z TC CENTRE PSN N2048 E11324=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 22:45 HKT 13/Aug/2018

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 11 p.m., Tropical Storm Bebinca was estimated to be about 210 kilometres south-southwest of Hong Kong (near 20.6 degrees north 113.3 degrees east) and is forecast to move slowly, lingering around the seas off the coast of western Guangdong.

    In the past few hours, Bebinca has slightly intensified. According to the present forecast track, Bebinca is expected to be slow moving and will still be relatively erratic. The Observatory will take into consideration the variation of local wind strength and Bebincas movement to consider whether or not to issue the Strong Wind Signal, No. 3 before 6 a.m. on Tuesday morning. The public should stay on the alert and take note of the latest weather information before leaving home on Tuesday.

    (Precautionary Announcements with No. 1 Signal)

    1. Every precaution should be taken. Objects likely to be blown away should be secured or taken indoors. Check if all windows and doors can be securely locked.

    2. There may be swells, you are advised to stay away from the shoreline.

    3. People planning to visit Guangdong, Macau, outlying islands or remote parts of Hong Kong should note that changes in weather may affect your trips.

    4. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest information on the tropical cyclone.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 13/Aug/2018


    Tropical Cyclone Warning

    At 131200 UTC, the tropical storm Bebinca (1816) with central pressure 984 hectopascals was centred within 60 nautical miles of two zero point six degrees north (20.6 N) one one three point three degrees east (113.3 E) and is forecast to be slow moving for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 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 141200 UTC
    Two one point two degrees north (21.2 N)
    One one two point seven degrees east (112.7 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 151200 UTC
    Two one point four degrees north (21.4 N)
    One one zero point six degrees east (110.6 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 161200 UTC
    Two zero point eight degrees north (20.8 N)
    One zero seven point eight degrees east (107.8 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 171200 UTC
    Dissipated over land.

    Bulletin issued at 06:31 HKT 13/Aug/2018


    Tropical Cyclone Warning

    At 122100 UTC, Tropical Storm Yagi (1814) with central pressure 990 hectopascals was centred within 60 nautical miles of three zero point one degrees north (30.1 N) one two zero point one degrees east (120.1 E) and is forecast to move northwest at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 132100 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 13/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.1 C
Minimum Air Temperature                     25.8 C
Grass Minimum Temperature                   25.9 C
Relative Humidity                        90 - 97 Percent
Rainfall                                    18.9 mm 
Total rainfall since 1st January          1108.4 mm
Against an average of                     1640.1 mm

Other Stations                Min                  Max
King's Park                  25.6 C               28.4 C
Wong Chuk Hang               25.7 C               28.5 C
Ta Kwu Ling                  25.3 C               27.5 C
Lau Fau Shan                 24.7 C               27.4 C
Tai Po                       25.2 C               27.9 C
Sha Tin                      25.6 C               28.7 C
Tuen Mun                     25.2 C               27.8 C
Tseung Kwan O                25.4 C               27.9 C
Sai Kung                     25.8 C               28.7 C
Cheung Chau                  24.3 C               26.5 C
Chek Lap Kok                 26.1 C               29.4 C
Tsing Yi                     25.9 C               29.7 C
Tsuen Wan Ho Koon            24.8 C               26.8 C
Tsuen Wan Shing Mun Valley   25.3 C               28.6 C
Hong Kong Park               25.1 C               27.3 C
Shau Kei Wan                 25.0 C               28.0 C
Kowloon City                 25.5 C               28.9 C
Happy Valley                 26.3 C               29.5 C
Wong Tai Sin                 25.8 C               29.0 C
Stanley                      25.0 C               28.1 C
Kwun Tong                    25.8 C               28.8 C
Sham Shui Po                 26.1 C               29.9 C
Kai Tak Runway Park          25.9 C               29.2 C
Yuen Long Park               25.2 C               27.8 C
Tai Mei Tuk               25.2 C               27.3 C

Duration of sunshine (King's Park):              0.2 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 (12 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                        0.13

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 12 Aug
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