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Bulletin issued at 23:02 HKT 12/Aug/2018

At 11 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 90 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 28 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 28 degrees;
Stanley 28 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 27 degrees.

Here is the information on Tropical Storm:
Location: 20.5 degrees north, 112.4 degrees east; Maximum sustained wind near its centre: 65 km/h.

Here is the information on Tropical Storm Yagi at 11 p.m.:
Location: 28.0 degrees north, 121.3 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

Information on Tropical Cyclones

Hong Kong Climatology


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

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Bulletin updated at 23:15 HKT 12/Aug/2018

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

The tropical depression over the northern part of the South China Sea intensified into a tropical storm and brought heavy squally showers and thunderstorms to the region today. Locally, it was cloudy with occasional heavy squally showers and thunderstorms. More than 40 millimetres of rainfall were recorded over most parts of the territory, and rainfall even exceeded 70 millimetres over Tai Po and Sha Tin. The tropical cyclone will continue to bring heavy squally showers and thunderstorms to the northern part of the South China Sea in the next couple of days.

Weather forecast for Hong Kong (Monday, 13 Aug 2018)

Mainly cloudy with occasional squally showers. A few thunderstorms later. Temperatures will range between 26 and 29 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore and on high ground. There will be swells.

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


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/08/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

Information on Tropical Cyclones

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 12/Aug/2018

GALE WARNING AREAS: KWANGTUNG AND PARACEL.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON TROPICAL STORM OVER THE NORTHERN PART OF THE SOUTH CHINA SEA AND TROPICAL STORM YAGI (1814), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= E TO SE 5-6, OCNL 7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. TEMP 26-29 C. =
KWANGTUNG= S 6-7, CYCLONIC 8 IN W. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M IN W. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S TO SW 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M, NE 3 M. =
BASHI= W TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M, NE UP TO 3 M. =
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. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M, NE UP TO 3 M. =
SCARBOROUGH= SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3-4 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 5-6. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
DANANG= W TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 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
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 12/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 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 11 p.m., the tropical storm over the northern part of the South China Sea with maximum sustained winds of about 65 kilometres per hour near its centre was located near 20.5 degrees north, 112.4 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 85 kilometres per hour near its centre was located near 28.0 degrees north, 121.3 degrees east. It is forecast to move northwest at about 34 kilometres per hour across Zhejian.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6, occasionally force 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 cyclonic force 8 later.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough seas later.

    Shangchuan Dao:
    Cyclonic force 8, becoming north to northwest up to force 8 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas.

    Outlook for the next 48 hours
    Cyclonic winds of force 8 to 9 in west. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 3
      Visibility 29 Kilometres

    Shantou Wind southeast force 1
      Visibility 30 Kilometres

    Dongsha Wind west-southwest force 3
      Visibility 9 Kilometres in rain

    Huangmaozhou Wind southeast force 5

    Macau Wind east-northeast force 4
      Visibility 28 Kilometres

    Xisha Wind southwest force 4
      Visibility 2500 Metres in showers

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 12/AUG/2018
    (Next update at 01:30 HKT 13/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 STORM OVER THE NORTHERN
     PART OF THE SOUTH CHINA SEA WAS CENTRED 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 WAS LOCATED NEAR
     27.1 DEGREES NORTH, 123.3 DEGREES  IT IS
     FORECAST TO MOVE NORTHWEST AT ABOUT 18 KNOTS
     ACROSS THE EAST CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/15, OCNL 20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  090/20-25, OCNL 30                   27-26
   B.   2000 FT:  120/20-25, OCNL 30                   24
   C.   5000 FT:  090/25                               20
   D.  10000 FT:  090/25                               12
   E.  18000 FT:  120/20                               MS1
   F.  24000 FT:  130/20                               MS11
   G.  30000 FT:  140/25                               MS25
   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 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: 17500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.5 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 21:19 HKT on 12 Aug 18

    VHHK SIGMET 5 VALID 121019/121500 VHHH- VHHK HONG KONG FIR TC NN PSN N2100 E11212 CB OBS AT 0900Z WI 240NM OF TC CENTRE TOP FL450 NC FCST AT 1500Z TC CENTRE PSN N2054 E11230= VHHK SIGMET 7 VALID 121319/121800 VHHH- VHHK HONG KONG FIR TC NN PSN N2042 E11212 CB OBS AT 1200Z WI 240NM OF TC CENTRE TOP FL450 NC FCST AT 1800Z TC CENTRE PSN N2042 E11230=

    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 22:45 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 11 p.m., the tropical storm over the northern part of the South China Sea was estimated to be about 270 kilometres southwest of Hong Kong (near 20.5 degrees north 112.4 degrees east) and is forecast to move slowly, lingering around the seas off the coast of western Guangdong.

    In the past few hours, the tropical storm maintained a distance of over 200 kilometres from Hong Kong. Unless the tropical storm rapidly intensifies or moves closer to the Pearl River Delta region, the chance of issuing the Strong Wind Signal, No. 3 before 6 a.m. on Monday morning is not high. The public is advised to take note of the latest weather information before leaving home on Monday morning.

    The track of the tropical storm will still be relatively erratic. The Observatory will take into consideration the variation in local wind strength and movement of the tropical storm to consider whether or not to issue the Strong Wind Signal, No. 3 during the day on Monday.

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

    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. Fishing vessels and low power vessels in open sea should seek shelter as soon as possible and be secured properly with moorings.

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

    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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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 21:31 HKT 12/Aug/2018


    Tropical Cyclone Warning

    At 121200 UTC, the tropical storm Yagi (1814) with central pressure 988 hectopascals was centred within 60 nautical miles of two seven point eight degrees north (27.8 N) one two two point one degrees east (122.1 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 45 knots.

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

    Forecast position and intensity at 131200 UTC
    Three three point one degrees north (33.1 N)
    One one six point seven degrees east (116.7 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 141200 UTC
    Dissipated over land.

    Bulletin issued at 21:30 HKT 12/Aug/2018


    Tropical Cyclone Warning

    At 121200 UTC, the tropical storm over the northern part of South China Sea with central pressure 990 hectopascals was centred within 60 nautical miles of two zero point seven degrees north (20.7 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 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 90 nautical miles.

    Forecast position and intensity at 131200 UTC
    Two zero point eight degrees north (20.8 N)
    One one three point three degrees east (113.3 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 141200 UTC
    Two one point two degrees north (21.2 N)
    One one two point three degrees east (112.3 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 151200 UTC
    Two one point four degrees north (21.4 N)
    One zero nine point seven degrees east (109.7 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 161200 UTC
    Two zero point six degrees north (20.6 N)
    One zero six point eight degrees east (106.8 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 171200 UTC
    One nine point eight degrees north (19.8 N)
    One zero five point six degrees east (105.6 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 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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