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Bulletin issued at 09:02 HKT 11/Aug/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 26 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.

Announcement on Localised Heavy Rain: More than 70 millimetres of rainfall were recorded in Kwai Tsing District, Tsuen Wan District and Sham Shui Po District in the past 1 hour ending at 7:55 a.m. and may cause serious flooding.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Amber Rainstorm Warning Signal has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 10:00 a.m. today. Occasional squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 7:45 and 8:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

North District 0 to 44 mm;
Tai Po 4 to 43 mm;
Yuen Long 0 to 40 mm;
Islands District 0 to 26 mm;
Southern District 0 to 26 mm;
Central & Western District 13 to 24 mm;
Tsuen Wan 3 to 22 mm;
Sai Kung 1 to 19 mm;
Wan Chai 5 to 19 mm;
Sha Tin 0 to 17 mm;
Tuen Mun 1 to 15 mm;
Eastern District 0 to 15 mm;
Kowloon City 0 to 12 mm;
Kwai Tsing 1 to 12 mm;
Yau Tsim Mong 5 to 11 mm;
Sham Shui Po 6 to 8 mm.

Between midnight and 9 a.m. the minimum temperature was 25.8 degrees Celsius at the Hong Kong Observatory.

Here is the information on Tropical Depression:
Location: 20.9 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


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Bulletin updated at 08:45 HKT 11/Aug/2018

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

Weather forecast for today

Cloudy with occasional squally showers and thunderstorms. Showers will be heavy at first. The maximum temperature will be about 30 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

Outlook : There will be occasional squally showers and thunderstorms in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 11/08/2018; 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.


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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 11/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.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 9 a.m., the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 55 kilometres per hour near its centre was located near 20.9 degrees north, 111.7 degrees east. It is forecast to move northeast slowly, lingering around the seas off 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 25.1 degrees north, 129.6 degrees east. It is forecast to move northwest at about 22 kilometres per hour across the Western North Pacific.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 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:
    Cyclonic 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, cyclonic winds of force 7 to 8 in west at first. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 3
      Visibility 20 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 29 Kilometres

    Dongsha Wind southwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south-southeast force 3

    Macau Wind east force 2
      Visibility 3800 Metres in rain

    Xisha Wind southwest force 5
      Visibility 12 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 11/AUG/2018
    (Next update at 12:30 HKT 11/AUG/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., THE TROPICAL DEPRESSION OVER THE
     NORTHERN PART OF THE SOUTH CHINA SEA WAS WAS
     LOCATED NEAR 20.9 DEGREES NORTH 111.7 DEGREES
     EAST AND IS FORECAST TO MOVE NORTHEAST SLOWLY,
     LINGERING AROUND THE SEAS OFF THE COAST OF
     WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  120/15-20
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/20-25, OCNL 30                   26-29
   B.   2000 FT:  150/20-25, OCNL 30G40                23
   C.   5000 FT:  160/20-25                            19
   D.  10000 FT:  160/25                               12
   E.  18000 FT:  150/20                               MS3
   F.  24000 FT:  200/20                               MS12
   G.  30000 FT:  150/15                               MS25
   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    : 8 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH TO OCCASIONALLY STRONG 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 08:47 HKT on 11 Aug 18

    VHHK SIGMET 1 VALID 110050/110450 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2142 E11642 - N1906 E11418 - N1948 E11130 - N2130 E11130 - N2336 E11624 - N2142 E11642 TOP FL450 STNR NC= VHHK SIGMET 6 VALID 102050/110050 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2136 E11606 - N1800 E11248 - N1930 E11130 - N2124 E11130 - N2242 E11424 - N2136 E11606 TOP FL450 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 08:45 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 9 a.m., the tropical depression over the northern part of the South China Sea was estimated to be about 300 kilometres west-southwest of Hong Kong (near 20.9 degrees north 111.7 degrees east) and is forecast to move northeast slowly, lingering around the seas off the coast of western Guangdong.
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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 09:30 HKT 11/Aug/2018


    Tropical Cyclone Warning

    At 110000 UTC, the tropical depression over the northern part of South China Sea with central pressure 994 hectopascals was centred within 90 nautical miles of two one point zero degrees north (21.0 N) one one one point eight degrees east (111.8 E) and is forecast to move north-northeast at about 4 knots 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 120000 UTC
    Two one point seven degrees north (21.7 N)
    One one one point seven degrees east (111.7 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 130000 UTC
    Two one point five degrees north (21.5 N)
    One one one point three degrees east (111.3 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 140000 UTC
    Two one point two degrees north (21.2 N)
    One one zero point one degrees east (110.1 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 150000 UTC
    Two zero point two degrees north (20.2 N)
    One zero seven point four degrees east (107.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 160000 UTC
    One nine point six degrees north (19.6 N)
    One zero six point one degrees east (106.1 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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