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Bulletin issued at 09:41 HKT 17/Aug/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 96 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.1. The intensity of UV radiation was low.

Widespread heavy rain may affect Hong Kong shortly. Members of the public should be on the alert.


Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until noon today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 26 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 27 degrees.

Between 7:45 and 8:45 a.m., lightning was detected within New Territories East, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Eastern District 8 to 22 mm;
Kowloon City 9 to 22 mm;
Kwun Tong 6 to 21 mm;
Sham Shui Po 5 to 18 mm;
Wong Tai Sin 4 to 16 mm;
Islands District 0 to 15 mm;
Sai Kung 0 to 14 mm;
Southern District 0 to 14 mm;
Tuen Mun 0 to 14 mm;
Wan Chai 9 to 11 mm;
Yau Tsim Mong 6 to 8 mm;
Central & Western District 0 to 6 mm;
Sha Tin 0 to 5 mm;
Kwai Tsing 0 to 3 mm;
Tsuen Wan 0 to 1 mm;
Tai Po 0 to 1 mm.

Between midnight and 9 a.m. the minimum temperature was 26.4 degrees Celsius at the Hong Kong Observatory.

Here is the information on Tropical Storm Bebinca at 9 a.m.:
Location: 19.5 degrees north, 105.9 degrees east.


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


Climatological Information for 17 Aug

Regional Weather in Hong Kong

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Bulletin updated at 09:25 HKT 17/Aug/2018

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

Showers are affecting the coast of Guangdong and the northern part of the South China Sea.

At 8 a.m., Tropical Storm Bebinca was centred about 170 kilometres south of Hanoi. It is forecast to move west at about 10 kilometres per hour across the northern part of Vietnam. Meanwhile, Tropical Storm Rumbia has made landfall over Shanghai. Rumbia was centred about 70 kilometres west of Shanghai. It is forecast to move west-northwest at about 22 kilometres per hour across the vicinity of Zhejiang and Shanghai and move inland.

Weather forecast for today

Mainly cloudy with occasional showers and thunderstorms. Showers will be heavy at times at first. The maximum temperature will be about 30 degrees. Moderate south to southwesterly winds.

Outlook : Still a few showers tomorrow. Sunny periods early next week.


(The above forecast period is valid up to 23:59 HKT today, 17/08/2018; 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 17/Aug/2018

GALE WARNING AREA: TONKIN.

GENERAL SITUATION AT 162100 UTC:
FOR DETAILS ON TROPICAL STORM BEBINCA (1816), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 170100 UTC:

HONG KONG= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. TEMP 30-27 C. =
KWANGTUNG= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S TO SW 2 M. =
TAIWAN STRAIT= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
BASHI= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
PRATAS= S TO SW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2-3 M. =
BALINTANG= SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3 M. =
PARACEL= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 3 M. =
TONKIN= CYCLONIC 8-9, S TO SE 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 3-4 M LATER. SWELL SW 2 M. =
DANANG= S TO SE 6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 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 17/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 17 August 2018

    Warnings:
    Strong winds in Shangchuan Dao.

    Weather Situation:
    At 9 a.m., Tropical Storm Bebinca with maximum sustained winds of about 85 kilometres per hour near its centre was located near 19.5 degrees north, 105.9 degrees east. It is forecast to move west at about 10 kilometres per hour across the northern part of Vietnam.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 4 to 5.
    Scattered squally showers and thunderstorms. Showers will be heavy at times.
    Moderate seas.

    Nan'ao, Shanwei and South of Hong Kong:
    South to southwest force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Shangchuan Dao:
    South to southwest force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

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

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

    Shantou Wind west force 2
      Visibility 30 Kilometres

    Dongsha Wind southwest force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind southwest force 2

    Macau Wind west-southwest force 1
      Visibility 14 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 12 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 17/AUG/2018
    (Next update at 12:30 HKT 17/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS ARE AFFECTING THE COAST OF GUANGDONG AND
     THE NORTHERN PART OF THE SOUTH CHINA SEA.
     AT 9 A.M., TROPICAL STORM BEBINCA WAS CENTRED
     NEAR 19.5 DEGREES NORTH, 105.9 DEGREES EAST.  IT
     IS FORECAST TO MOVE WEST AT ABOUT 5 KNOTS ACROSS
     THE NORTHERN PART OF VIETNAM.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  200/5-10
                  TEMPO VRB/15G25 IN TS                26-30
   B.   2000 FT:  200/10                               23
   C.   5000 FT:  200/10                               20
   D.  10000 FT:  180/10                               13
   E.  18000 FT:  290/10                               MS1
   F.  24000 FT:  010/10                               MS11
   G.  30000 FT:  090/10                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT  BKN 10000 FT.  TEMPO
      FEW CB 600 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     LIGHT TO MODERATE SOUTH TO SOUTHWESTERLY WINDS.
     MAINLY CLOUDY WITH ISOLATED SHOWERS AND
     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 07:25 HKT on 17 Aug 18

    VHHK SIGMET 3 VALID 161930/162330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2212 E11730 - N2154 E11730 - N2006 E11518 - N2000 E11354 - N2142 E11412 - N2254 E11730 - N2212 E11730 TOP FL430 MOV NE 10KT NC= VHHK SIGMET 4 VALID 162330/170330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2206 E11730 - N2042 E11506 - N2136 E11406 - N2242 E11424 - N2300 E11500 - N2336 E11730 - N2206 E11730 TOP FL420 MOV NE 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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    Bulletin issued at 09:30 HKT 17/Aug/2018


    Tropical Cyclone Warning

    At 170000 UTC, Tropical Storm Bebinca (1816) with central pressure 986 hectopascals was centred within 60 nautical miles of one nine point five degrees north (19.5 N) one zero five point seven degrees east (105.7 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 40 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 180000 UTC
    Dissipated over land.

    Bulletin issued at 18:31 HKT 16/Aug/2018


    Tropical Cyclone Warning

    At 160900 UTC, Tropical Storm Rumbia (1818) with central pressure 988 hectopascals was centred within 60 nautical miles of three zero point three degrees north (30.3 N) one two three point nine degrees east (123.9 E) and is forecast to move west-northwest at about 10 knots for the next 24 hours.

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

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 180 nautical miles over eastern semicircle, 90 nautical miles elsewhere.

    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 170900 UTC
    Three one point four degrees north (31.4 N)
    One one seven point six degrees east (117.6 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 180900 UTC
    Three two point three degrees north (32.3 N)
    One one three point seven degrees east (113.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 190900 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 17/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.0 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   26.5 C
Relative Humidity                        84 - 95 Percent
Rainfall                                     3.2 mm 
Total rainfall since 1st January          1146.8 mm
Against an average of                     1707.4 mm

Other Stations                Min                  Max
King's Park                  26.4 C               29.6 C
Wong Chuk Hang               26.3 C               29.5 C
Ta Kwu Ling                  25.5 C               29.8 C
Lau Fau Shan                 25.4 C               29.8 C
Tai Po                       26.0 C               28.6 C
Sha Tin                      26.1 C               30.6 C
Tuen Mun                     26.0 C               30.0 C
Tseung Kwan O                25.6 C               28.5 C
Sai Kung                     26.1 C               29.2 C
Cheung Chau                  25.5 C               29.4 C
Chek Lap Kok                 27.1 C               31.6 C
Tsing Yi                     26.5 C               30.3 C
Tsuen Wan Ho Koon            25.1 C               27.5 C
Tsuen Wan Shing Mun Valley   25.8 C               28.8 C
Hong Kong Park               25.9 C               30.2 C
Shau Kei Wan                 25.6 C               29.4 C
Kowloon City                 25.9 C               29.3 C
Happy Valley                 26.9 C               30.9 C
Wong Tai Sin                 26.1 C               29.2 C
Stanley                      25.9 C               29.3 C
Kwun Tong                    26.3 C               29.4 C
Sham Shui Po                 26.3 C               30.5 C
Kai Tak Runway Park          26.4 C               29.1 C
Yuen Long Park               25.9 C               30.9 C
Tai Mei Tuk               25.4 C               28.3 C

Duration of sunshine (King's Park):              0.8 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 (16 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 16 Aug
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