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Bulletin issued at 04:02 HKT 15/Aug/2018

At 4 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 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 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 25 degrees;
Tai Po 27 degrees;
Sha Tin 26 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 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 27 degrees;
Kowloon City 27 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

Between 2:45 and 3:45 a.m., the rainfall recorded in various regions were:

North District 0 to 4 mm;
Tuen Mun 0 to 4 mm;
Yuen Long 0 to 2 mm;
Tai Po 0 to 1 mm;
Tsuen Wan 0 to 1 mm.

Here is the information on Tropical Storm Bebinca:
Location: 21.1 degrees north, 112.7 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 15 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 03:45 HKT 15/Aug/2018

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

Weather forecast for today

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

Outlook : There will still be showers in the following 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 21:00 HKT 14/Aug/2018

STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREAS: HONG KONG, BASHI, PRATAS, BALINTANG, SCARBOROUGH AND PARACEL.

GENERAL SITUATION AT 140900 UTC:
FOR DETAILS ON TROPICAL STORM BEBINCA (1816), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 141300 UTC:

HONG KONG= E TO SE 6-7, UP TO 8 IN S. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN S. SWELL S TO SW 2-3 M. TEMP 26-30 C. =
KWANGTUNG= CYCLONIC 8-9, BEC 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 10 M. 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, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 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 7-8, UP TO 9 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 8 M AT FIRST. SWELL SW 3-4 M. =
TONKIN= W TO 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. =
DANANG= SW 6-7. DOWN TO 1000 M IN OCNL 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 03:30 HKT 15/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 15 August 2018

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

    Weather Situation:
    At 3 a.m., Tropical Storm Bebinca with maximum sustained winds of about 85 kilometres per hour near its centre was located near 21.1 degrees north, 112.8 degrees east. It is forecast to move northwest or west-northwest at about 8 kilometres per hour gradually edging closer to the vicinity of the coast of western Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, up to force 7 in south.
    Occasional heavy squally showers and thunderstorms.
    Rough seas.

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

    South of Hong Kong:
    South to southwest force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shangchuan Dao:
    Cyclonic force 8 to 9.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Outlook for the next 48 hours
    Southerly winds of force 6 to 7, up to force 8 in west. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 4
      Visibility 17 Kilometres

    Shantou Wind southeast force 2
      Visibility 5000 Metres

    Huangmaozhou Wind south-southeast force 6

    Macau Wind southeast force 2
      Visibility 9 Kilometres

    Xisha Wind southwest force 5
      Visibility 9 Kilometres

  • Explanation of Seas or Sea Waves
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  • Visibility Readings in Hong Kong Waters
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 15/AUG/2018
    (Next update at 9:00-9:30 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 :
     AT 1 A.M., TROPICAL STORM BEBINCA WAS CENTRED
     NEAR 21.1 DEGREES NORTH 113.0 DEGREES EAST AND
     IS FORECAST TO MOVE NORTHWEST AT ABOUT 5 KNOTS,
     GRADUALLY EDGING CLOSER TO THE VICINITY OF THE
     COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/15-20, OCNL 25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  120/25-30G40                         26-29
   B.   2000 FT:  140/25-30G40                         23
   C.   5000 FT:  130/30                               19
   D.  10000 FT:  120/30                               13
   E.  18000 FT:  100/25                               0
   F.  24000 FT:  100/25                               MS10
   G.  30000 FT:  100/20                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL SQUALLY SHOWERS
      AND A FEW 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: 18000 FT      10 DEG. C LEVEL(S) : 12200 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-5.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO STRONG EAST TO SOUTHEASTERLY WINDS.
     MAINLY CLOUDY WITH OCCASIONAL SQUALLY SHOWERS
     AND A FEW 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.

    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 03:40 HKT on 15 Aug 18

    VHHK SIGMET 11 VALID 141640/142100 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2100 E11312 CB OBS AT 1500Z WI 150NM OF TC CENTRE TOP FL520 INTSF FCST AT 2100Z TC CENTRE PSN N2100 E11236= VHHK SIGMET 13 VALID 141940/150000 VHHH- VHHK HONG KONG FIR TC BEBINCA PSN N2106 E11254 CB OBS AT 1800Z WI 150NM OF TC CENTRE TOP FL520 NC FCST AT 0000Z TC CENTRE PSN N2106 E11218=

    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 03:45 HKT 15/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.

    At 4 a.m., Tropical Storm Bebinca was estimated to be about 200 kilometres southwest of Hong Kong (near 21.1 degrees north 112.7 degrees east) and is forecast to move west at about 8 kilometres per hour skirting the coastal waters of western Guangdong, generally towards the vicinity of Leizhou Peninsula.
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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 03:30 HKT 15/Aug/2018


    Tropical Cyclone Warning

    At 141800 UTC, Tropical Storm Bebinca (1816) with central pressure 984 hectopascals was centred within 90 nautical miles of two one point one degrees north (21.1 N) one one two point nine degrees east (112.9 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 45 knots.

    Radius of over 33 knot winds 60 nautical miles over southern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 120 nautical miles over southern semicircle, 90 nautical miles elsewhere.

    Forecast position and intensity at 151800 UTC
    Two zero point seven degrees north (20.7 N)
    One one zero point six degrees east (110.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 161800 UTC
    Two zero point zero degrees north (20.0 N)
    One zero seven point six degrees east (107.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 171800 UTC
    One nine point eight degrees north (19.8 N)
    One zero two point four degrees east (102.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 181800 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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