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Bulletin issued at 03:02 HKT 10/Aug/2018

At 3 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 95 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 27 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 27 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 28 degrees;
Stanley 29 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 26 degrees.

Between 1:45 and 2:45 a.m., the rainfall recorded in various regions were:

Kwai Tsing 4 to 14 mm;
North District 0 to 12 mm;
Tai Po 0 to 11 mm;
Tsuen Wan 3 to 10 mm;
Islands District 0 to 8 mm;
Tuen Mun 3 to 7 mm;
Yuen Long 0 to 6 mm;
Kowloon City 0 to 6 mm;
Sham Shui Po 3 to 5 mm;
Sai Kung 0 to 5 mm;
Sha Tin 1 to 5 mm;
Yau Tsim Mong 0 to 4 mm;
Wong Tai Sin 4 mm;
Central & Western District 0 to 1 mm;
Eastern District 0 to 1 mm;
Kwun Tong 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 18.8 degrees north, 111.8 degrees east; Maximum sustained wind near its centre: 45 km/h.


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


Climatological Information for 10 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 02:45 HKT 10/Aug/2018

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

Weather forecast for today

Mainly cloudy with squally showers and isolated thunderstorms. Temperatures will range between 27 and 31 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

Outlook : The weather will be unsettled with squally showers and thunderstorms over the weekend.


(The above forecast period is valid up to 23:59 HKT today, 10/08/2018; 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 09/Aug/2018

N0 WARNING.

GENERAL SITUATION AT 090900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE CENTRAL AND NORTHERN PARTS OF SOUTH CHINA SEA, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 091300 UTC:

HONG KONG= E TO SE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E UP TO 2 M. TEMP 27-31 C. =
KWANGTUNG= E TO SE 5-6, CYCLONIC 6-7 IN W LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 3-4 M IN W LATER. SWELL E 2 M. =
TAIWAN STRAIT= SE 4, OCNL 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
PRATAS= S 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
BALINTANG= W TO SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW 2 M. =
SCARBOROUGH= S TO SW 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2 M. =
PARACEL= CYCLONIC 6-7, SW 6 LATER. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M ,3 M LATER. SWELL S TO SW 2 M. =
TONKIN= N TO NW 4-5, OCNL 6. DOWN TO 500 M IN FREQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= W 5-6, OCNL 7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2 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 03:30 HKT 10/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 10 August 2018

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    At 3 a.m., the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 45 kilometres per hour near its centre was located near 18.8 degrees north, 111.8 degrees east. It is forecast to move north-northwest at about 12 kilometres per hour in the general direction towards the vicinity of the coast of western Guangdong to Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 6 to 7.
    Isolated squally showers and thunderstorms.
    Rough seas.

    Nan'ao:
    East to southeast force 4 to 5, occasionally force 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    Shanwei:
    East to southeast force 5 to 6.
    Isolated squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    East to southeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    South to southwest force 6 to 7, cyclonic force 6 to 7 in south.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 6 to 7, force 5 later. Scattered heavy squally showers and thunderstorms.

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

    Waglan Island Wind southeast force 5
      Visibility 16 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 11 Kilometres

    Huangmaozhou Wind south-southeast force 4

    Macau Wind east force 3
      Visibility 21 Kilometres

    Xisha Wind southwest force 5
      Visibility 11 Kilometres

  • Explanation of Seas or Sea Waves
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  • 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 01:30 HKT 10/AUG/2018
    (Next update at 9:00-9:30 HKT 10/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 MIDNIGHT, THE TROPICAL DEPRESSION OVER THE NORTHERN PART
     OF THE SOUTH CHINA SEA WAS CENTRED NEAR 18.5 DEGREES NORTH
     111.8 DEGREES EAST AND IS FORECAST TO MOVE NORTH-NORTHWEST
     AT ABOUT 6 KNOTS IN THE GENERAL DIRECTION TOWARDS THE VICINITY
     OF THE COAST OF WESTERN GUANGDONG TO HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/15, OCNL 20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  090/25-30                            28-31
   B.   2000 FT:  120/25, OCNL 30                      25
   C.   5000 FT:  120/20-25                            20
   D.  10000 FT:  120/20                               11
   E.  18000 FT:  100/15                               MS2
   F.  24000 FT:  090/15                               MS12
   G.  30000 FT:  120/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SQUALLY SHOWERS AND ISOLATED 
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 3500 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 3500 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10200 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4.0-5.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS, STRONG 
     OFFSHORE AND ON HIGH GROUND.  MAINLY CLOUDY WITH SQUALLY
     SHOWERS AND ISOLATED 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 00:50 HKT on 10 Aug 18

    VHHK SIGMET 4 VALID 091250/091650 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2230 E11730 - N2100 E11130 - N1900 E11200 - N1900 E11548 - N2100 E11730 - N2230 E11730 TOP FL420 MOV NW 10KT NC= VHHK SIGMET 5 VALID 091650/092050 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N1850 TOP FL420 MOV NW 10KT 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 02:45 HKT 10/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 3 a.m., the tropical depression over the northern part of the South China Sea was estimated to be about 460 kilometres south-southwest of Hong Kong (near 18.8 degrees north 111.8 degrees east) and is forecast to move north-northwest at about 12 kilometres per hour in the general direction towards the vicinity of the coast of western Guangdong to Hainan Island.
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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 03:30 HKT 10/Aug/2018


    Tropical Cyclone Warning

    At 091800 UTC, the tropical depression over the South China Sea with central pressure 998 hectopascals was centred within 90 nautical miles of one eight point seven degrees north (18.7 N) one one one point eight degrees east (111.8 E) and is forecast to move north-northwest at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 101800 UTC
    Two zero point six degrees north (20.6 N)
    One one one point four degrees east (111.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 111800 UTC
    Two one point one degrees north (21.1 N)
    One one one point three degrees east (111.3 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 121800 UTC
    Two one point three degrees north (21.3 N)
    One one zero point two degrees east (110.2 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 131800 UTC
    Two one point two degrees north (21.2 N)
    One zero eight point four degrees east (108.4 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 141800 UTC
    Two zero point six degrees north (20.6 N)
    One zero five point five degrees east (105.5 E)
    Maximum winds 25 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 10/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.6 C
Minimum Air Temperature                     29.2 C
Grass Minimum Temperature                   27.4 C
Relative Humidity                        60 - 82 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           989.7 mm
Against an average of                     1584.4 mm

Other Stations                Min                  Max
King's Park                  28.3 C               32.7 C
Wong Chuk Hang               28.5 C               33.0 C
Ta Kwu Ling                  26.3 C               34.7 C
Lau Fau Shan                 26.5 C               33.4 C
Tai Po                       28.3 C               31.9 C
Sha Tin                      28.5 C               33.1 C
Tuen Mun                     27.5 C               32.9 C
Tseung Kwan O                27.9 C               33.1 C
Sai Kung                     28.8 C               31.5 C
Cheung Chau                  28.1 C               31.9 C
Chek Lap Kok                 29.0 C               35.9 C
Tsing Yi                     28.9 C               33.5 C
Tsuen Wan Ho Koon            26.1 C               32.3 C
Tsuen Wan Shing Mun Valley   27.8 C               32.4 C
Hong Kong Park               28.2 C               32.9 C
Shau Kei Wan                 28.0 C               31.1 C
Kowloon City                 28.1 C               32.8 C
Happy Valley                 28.8 C               33.3 C
Wong Tai Sin                 28.3 C               32.6 C
Stanley                      27.9 C               32.3 C
Kwun Tong                    27.9 C               32.1 C
Sham Shui Po                 28.5 C               34.2 C
Kai Tak Runway Park          28.6 C               31.7 C
Yuen Long Park               27.3 C               33.9 C
Tai Mei Tuk               26.5 C               32.6 C

Duration of sunshine (King's Park):              7.8 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
 

Yesterday's (09 Aug 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 09 Aug
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