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Bulletin issued at 17:02 HKT 11/Aug/2018

At 5 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 91 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 26 degrees;
Tai Po 28 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 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 26 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 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 3:45 and 4:45 p.m., the rainfall recorded in various regions were:

Tai Po 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 22.1 degrees north, 111.7 degrees east; Maximum sustained wind near its centre: 55 km/h.


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


Climatological Information for 11 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 16:45 HKT 11/Aug/2018

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

Weather forecast for tonight and tomorrow

Cloudy with occasional squally showers and a few thunderstorms. Temperatures will range between 26 and 29 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

Outlook : There will still be showers and thunderstorms in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 12/08/2018; 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 11/Aug/2018

GALE WARNING AREAS: KWANGTUNG AND SCARBOROUGH.

GENERAL SITUATION AT 102100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE NORTHERN PART OF THE SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 110100 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2 M. TEMP 30-26 C. =
KWANGTUNG= CYCLONIC 6-7, OCNL 8. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 2 M. =
BASHI= W 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
PRATAS= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
BALINTANG= W 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 6-7, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
PARACEL= 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. =
TONKIN= W TO NW 5-6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 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 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.


  • Map showing the 10 forecast areas
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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 11/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 11 August 2018

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

    Weather Situation:
    At 4 p.m., the tropical depression over the coast of western Guangdong with maximum sustained winds of about 55 kilometres per hour near its centre was located near 22.1 degrees north, 111.9 degrees east. It is forecast to move slowly, lingering over the coast of western Guangdong. Meanwhile, Tropical Storm Yagi with maximum sustained winds of about 65 kilometres per hour near its centre was located near 25.4 degrees north, 127.5 degrees east. It is forecast to move northwest at about 25 kilometres per hour across the vicinity of the Ryukyu Islands.

    Area forecasts for the next 24 hours

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

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

    South of Hong Kong:
    South force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    South to southwest force 6 to 7, occasionally force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    South to southwesterly winds of force 6 to 7. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 30 Kilometres

    Shantou Wind east-southeast force 3
      Visibility 30 Kilometres

    Dongsha Wind west force 2
      Visibility 9 Kilometres in rain

    Huangmaozhou Wind east force 5

    Macau Wind east force 3
      Visibility 23 Kilometres in thunderstorms

    Xisha Wind west-southwest force 5
      Visibility 12 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • 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 17:30 HKT 11/AUG/2018
    (Next update at 01:30 HKT 12/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 4 P.M., THE TROPICAL DEPRESSION OVER THE
     COAST OF WESTERN GUANGDONG  WAS LOCATED NEAR
     22.1 DEGREES NORTH 111.9 DEGREES EAST. IT IS
     FORECAST TO MOVE SLOWLY, LINGERING OVER 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:  120/15-20
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/20-25, OCNL 30                   28-26
   B.   2000 FT:  150/20-25, OCNL 30                   23
   C.   5000 FT:  120/20                               19
   D.  10000 FT:  160/25                               12
   E.  18000 FT:  160/20                               MS2
   F.  24000 FT:  190/15                               MS11
   G.  30000 FT:  180/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 800 FT  SCT 2000 FT  BKN 5000 FT. TEMPO FEW
      CB 700 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: 17500 FT      10 DEG. C LEVEL(S) : 10800 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EAST TO SOUTHEASTERLY WINDS, STRONG
     OFFSHORE AND ON HIGH GROUND. CLOUDY WITH
     OCCASIONAL SQUALLY 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.

    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 16:44 HKT on 11 Aug 18

    VHHK SIGMET 2 VALID 110450/110850 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2124 E11654 - N1824 E11230 - N1930 E11130 - N2130 E11130 - N2336 E11636 - N2124 E11654 TOP FL450 STNR NC= VHHK SIGMET 3 VALID 110850/111250 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1906 E11554 - N1836 E11218 - N1930 E11130 - N2130 E11130 - N2324 E11600 - N2100 E11730 TOP FL430 STNR NC=

    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 16:45 HKT 11/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 5 p.m., the tropical depression over the coast of western Guangdong was estimated to be about 260 kilometres west of Hong Kong (near 22.1 degrees north 111.7 degrees east) and is forecast to move slowly, lingering over the coast of western Guangdong.

    The rainbands associated with the tropical depression are expected to bring occasional showers and squalls to the territory in the next couple of days.

    The tropical depression is expected to linger over the coast of western Guangdong. The Standby Signal, No. 1 will be in effect for a period of time.

    (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. Drains should be cleared of leaves and rubbish. People in low-lying areas should take precautions against flooding.

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

    5. Construction and property management practitioners should make sure that overhanging facilities and temporary structures outdoors are securely fastened, and should take precautionary measures.

    6. 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 15:30 HKT 11/Aug/2018


    Tropical Cyclone Warning

    At 110600 UTC, the tropical depression over the coast of western Guangdong with central pressure 994 hectopascals was centred within 60 nautical miles of two two point zero degrees north (22.0 N) one one two point one degrees east (112.1 E) and is forecast to be slow moving for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 120600 UTC
    Two two point one degrees north (22.1 N)
    One one one point seven degrees east (111.7 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 130600 UTC
    Two one point eight degrees north (21.8 N)
    One one one point four degrees east (111.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 140600 UTC
    Two one point one degrees north (21.1 N)
    One one zero point four degrees east (110.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 150600 UTC
    Two zero point seven degrees north (20.7 N)
    One zero eight point four degrees east (108.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 160600 UTC
    Two zero point two degrees north (20.2 N)
    One zero six point two degrees east (106.2 E)
    Maximum winds 30 knots.



    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 11/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     29.5 C
Minimum Air Temperature                     26.0 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        79 - 97 Percent
Rainfall                                    47.9 mm 
Total rainfall since 1st January          1037.6 mm
Against an average of                     1603.7 mm

Other Stations                Min                  Max
King's Park                  25.5 C               29.1 C
Wong Chuk Hang               25.2 C               29.0 C
Ta Kwu Ling                  25.5 C               30.9 C
Lau Fau Shan                 24.8 C               29.2 C
Tai Po                       25.7 C               29.2 C
Sha Tin                      25.7 C               30.0 C
Tuen Mun                     25.0 C               29.4 C
Tseung Kwan O                24.9 C               29.1 C
Sai Kung                     25.6 C               29.5 C
Cheung Chau                  24.8 C               28.5 C
Chek Lap Kok                 25.6 C               30.5 C
Tsing Yi                     25.5 C               30.5 C
Tsuen Wan Ho Koon            24.5 C               27.6 C
Tsuen Wan Shing Mun Valley   25.0 C               29.1 C
Hong Kong Park               24.9 C               29.0 C
Shau Kei Wan                 24.3 C               28.7 C
Kowloon City                 25.2 C               29.2 C
Happy Valley                 25.7 C               30.1 C
Wong Tai Sin                 25.5 C               29.6 C
Stanley                      25.1 C               28.9 C
Kwun Tong                    25.1 C               29.2 C
Sham Shui Po                 25.6 C               30.1 C
Kai Tak Runway Park          25.3 C               29.4 C
Yuen Long Park               25.3 C               30.2 C
Tai Mei Tuk               25.1 C               30.1 C

Duration of sunshine (King's Park):              0.6 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 6.
 

Yesterday's (10 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 10 Aug
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