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Bulletin issued at 13:02 HKT 12/Aug/2018

At 1 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 90 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 4:30 p.m. today. A few squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 27 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 26 degrees;
Stanley 27 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

Between 11:45 a.m. and 12:45 p.m., the rainfall recorded in various regions were:

Tai Po 1 to 19 mm;
Sha Tin 1 to 14 mm;
Sai Kung 0 to 12 mm;
North District 2 to 12 mm;
Yuen Long 0 to 10 mm;
Tsuen Wan 0 to 5 mm;
Wong Tai Sin 1 to 3 mm;
Kwai Tsing 0 to 1 mm;
Islands District 0 to 1 mm;
Kwun Tong 0 to 1 mm.

Here is the information on Tropical Depression:
Location: 21.1 degrees north, 112.3 degrees east; Maximum sustained wind near its centre: 55 km/h.

Here is the information on Tropical Storm Yagi at noon:
Location: 26.0 degrees north, 123.8 degrees east.


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


Climatological Information for 12 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Local Weather Forecast

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

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Bulletin updated at 12:45 HKT 12/Aug/2018

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

Weather forecast for this afternoon and tonight

Cloudy with occasional squally showers and a few thunderstorms. Showers will be heavy at times. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground.

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


(The above forecast period is valid up to 23:59 HKT today, 12/08/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

Information on Tropical Cyclones

Marine Weather Information and Forecast

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 12/Aug/2018

GALE WARNING AREAS: KWANGTUNG, BASHI, BALINTANG, SCARBOROUGH AND PARACEL.

GENERAL SITUATION AT 112100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE COAST OF WESTERN GUANGDONG, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. TROPICAL STORM YAGI (1814) 990HPA 25N 125E NW 14KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 120100 UTC:

HONG KONG= E TO SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. TEMP 27-26 C. =
KWANGTUNG= S TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S TO SW 3 M. =
TAIWAN STRAIT= S TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M, NE 3 M LATER. =
BASHI= W TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 3 M, NE 3 M LATER. =
PRATAS= S TO SW 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
BALINTANG= W 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, NE UP TO 3 M LATER. =
SCARBOROUGH= SW 6-7, OCNL 8. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 3-4 M. =
PARACEL= SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. 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 SCT 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.


  • 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 12:30 HKT 12/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 12 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 noon, 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 21.1 degrees north, 112.3 degrees east. It is forecast to move slowly, lingering around the seas off the coast of western Guangdong. Meanwhile, Tropical Storm Yagi with maximum sustained winds of about 75 kilometres per hour near its centre was located near 26.0 degrees north, 123.8 degrees east. It is forecast to move northwest at about 30 kilometres per hour across the East China Sea.

    Area forecasts for the next 24 hours

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

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

    Shanwei:
    South force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong:
    South force 6 to 7, becoming force 8 later.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough seas later.

    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
    Cyclonic winds of force 7 to 8. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 5
      Visibility 24 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind west force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 4

    Macau Wind east force 3
      Visibility 11 Kilometres

    Xisha Wind southwest force 4
      Visibility 14 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
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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 12:30 HKT 12/AUG/2018
    (Next update at 17:30 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 NOON, THE TROPICAL DEPRESSION OVER THE
     NORTHERN PART OF THE SOUTH CHINA SEA WAS CENTRED
     NEAR 21.1 DEGREES NORTH 112.3 DEGREES EAST AND
     IS FORECAST TO MOVE SLOWLY, LINGERING AROUND THE
     SEAS OFF THE COAST OF WESTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1300 TO 2300 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/15, OCNL 20
                  TEMPO 120/20G30 IN TS
       OFFSHORE:  110/20-25, OCNL 30                   29-27
   B.   2000 FT:  110/20-25, OCNL 30                   23
   C.   5000 FT:  110/25                               20
   D.  10000 FT:  120/25                               12
   E.  18000 FT:  140/20                               MS2
   F.  24000 FT:  140/15                               MS10
   G.  30000 FT:  140/20                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND A
      FEW THUNDERSTORMS.  SHOWERS WILL BE HEAVY AT
      TIMES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT  BKN 8000 FT.  TEMPO
      FEW 600 FT  SCT CB 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 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 12:47 HKT on 12 Aug 18

    VHHK SIGMET 1 VALID 120050/120450 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2024 E11700 - N1642 E11400 - N1930 E11130 - N2130 E11130 - N2224 E11348 - N2300 E11524 - N2024 E11700 TOP FL450 STNR NC= VHHK SIGMET 2 VALID 120450/120850 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2030 E11706 - N1836 E11536 - N1824 E11230 - N1930 E11130 - N2130 E11130 - N2330 E11624 - N2030 E11706 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 12:45 HKT 12/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 1 p.m., the tropical depression over the northern part of the South China Sea was estimated to be about 240 kilometres southwest of Hong Kong (near 21.1 degrees north 112.3 degrees east) and is forecast to move 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 12:31 HKT 12/Aug/2018


    Tropical Cyclone Warning

    At 120300 UTC, Tropical Storm Yagi (1814) with central pressure 990 hectopascals was centred within 60 nautical miles of two five point nine degrees north (25.9 N) one two four point two degrees east (124.2 E) and is forecast to move northwest at about 18 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 300 nautical miles.

    Forecast position and intensity at 130300 UTC
    Three one point two degrees north (31.2 N)
    One one eight point three degrees east (118.3 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 140300 UTC
    Dissipated over land.

    Bulletin issued at 12:30 HKT 12/Aug/2018


    Tropical Cyclone Warning

    At 120300 UTC, the tropical depression over the northern part of South China Sea with central pressure 994 hectopascals was centred within 60 nautical miles of two one point one degrees north (21.1 N) one one two point two degrees east (112.2 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 130300 UTC
    Two zero point eight degrees north (20.8 N)
    One one two point eight degrees east (112.8 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 140300 UTC
    Two one point two degrees north (21.2 N)
    One one three point one degrees east (113.1 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 150300 UTC
    Two one point two degrees north (21.2 N)
    One one one point one degrees east (111.1 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 160300 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 170300 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 12/Aug/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.2 C
Minimum Air Temperature                     25.8 C
Grass Minimum Temperature                   24.9 C
Relative Humidity                        88 - 98 Percent
Rainfall                                    51.9 mm 
Total rainfall since 1st January          1089.5 mm
Against an average of                     1622.6 mm

Other Stations                Min                  Max
King's Park                  25.3 C               27.8 C
Wong Chuk Hang               25.1 C               28.1 C
Ta Kwu Ling                  25.6 C               28.1 C
Lau Fau Shan                 24.3 C               27.1 C
Tai Po                       25.7 C               28.1 C
Sha Tin                      25.9 C               28.6 C
Tuen Mun                     25.3 C               27.9 C
Tseung Kwan O                25.8 C               27.8 C
Sai Kung                     26.2 C               28.7 C
Cheung Chau                  24.7 C               27.0 C
Chek Lap Kok                 25.8 C               29.4 C
Tsing Yi                     25.3 C               28.4 C
Tsuen Wan Ho Koon            24.5 C               26.3 C
Tsuen Wan Shing Mun Valley   25.1 C               27.7 C
Hong Kong Park               24.8 C               27.2 C
Shau Kei Wan                 25.7 C               28.1 C
Kowloon City                 25.2 C               27.8 C
Happy Valley                 25.7 C               28.9 C
Wong Tai Sin                 25.8 C               28.2 C
Stanley                      25.3 C               28.0 C
Kwun Tong                    25.9 C               28.0 C
Sham Shui Po                 25.4 C               28.3 C
Kai Tak Runway Park          25.8 C               28.6 C
Yuen Long Park               24.6 C               28.0 C
Tai Mei Tuk               25.5 C               27.3 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 3.
 

Yesterday's (11 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                        0.13

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 11 Aug
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