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Bulletin issued at 07:41 HKT 12/Aug/2018

At 7 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 97 per cent.

Though rainstorm warning has been cancelled, people should stay alert to the danger that may be brought about by river flooding.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 9:00 a.m. today. A few squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 5:45 and 6:45 a.m., the rainfall recorded in various regions were:

Yuen Long 1 to 26 mm;
Tai Po 0 to 23 mm;
Sha Tin 1 to 23 mm;
Sai Kung 1 to 18 mm;
Tsuen Wan 1 to 8 mm;
Southern District 0 to 8 mm;
Tuen Mun 1 to 6 mm;
Islands District 0 to 5 mm;
Kwai Tsing 2 to 4 mm;
Central & Western District 3 to 4 mm;
Kwun Tong 1 to 4 mm;
North District 0 to 4 mm;
Kowloon City 3 mm;
Yau Tsim Mong 1 to 3 mm;
Eastern District 1 to 3 mm;
Sham Shui Po 2 to 3 mm;
Wong Tai Sin 1 to 2 mm;
Wan Chai 2 mm.

Here is the information on Tropical Depression:
Location: 21.1 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 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 06:45 HKT 12/Aug/2018

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

Weather forecast for today

Cloudy with occasional squally showers and a few thunderstorms. Showers will be heavy at times. The maximum temperature will be about 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 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 21:00 HKT 11/Aug/2018

GALE WARNING AREAS: KWANGTUNG, SCARBOROUGH AND PARACEL.

GENERAL SITUATION AT 110900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE COAST OF WESTERN GUANGDONG, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. TROPICAL STORM YAGI (1814) 992HPA 25N 127E NW 14KT INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 111300 UTC:

HONG KONG= E TO SE 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 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 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 3 M. =
BASHI= W TO SW 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 3 M. =
PRATAS= S TO SW 6-7. DOWN TO 1000 M IN SCT HEAVY 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. =
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= W TO 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 05:30 HKT 12/Aug/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 12 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 5 a.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 21.2 degrees north, 111.5 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 25.4 degrees north, 125.2 degrees east. It is forecast to move northwest at about 25 kilometres per hour across the East China Sea.

    Area forecasts for the next 24 hours

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

    Nan'ao and Shanwei:
    South force 5 to 6.
    Occasional 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:
    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
    Southwesterly winds of force 6 to 7, up to force 8 in west. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 4
      Visibility 2400 Metres

    Shantou Wind northeast force 1
      Visibility 29 Kilometres

    Huangmaozhou Wind east-southeast force 4

    Macau Wind east force 4
      Visibility 6 Kilometres in showers

    Xisha Wind southwest force 4
      Visibility 12 Kilometres

  • 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 01:30 HKT 12/AUG/2018
    (Next update at 9:00-9:30 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 11 P.M. LAST NIGHT, THE TROPICAL DEPRESSION
     OVER THE COAST OF WESTERN GUANGDONG WAS LOCATED
     NEAR 21.5 DEGREES NORTH 111.3 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 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/15-20
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  110/20-25, OCNL 30                   28-26
   B.   2000 FT:  120/20-25, OCNL 30                   23
   C.   5000 FT:  120/25                               18
   D.  10000 FT:  160/20                               13
   E.  18000 FT:  160/20                               MS1
   F.  24000 FT:  180/15                               MS10
   G.  30000 FT:  180/15                               MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND A
      FEW 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: 17000 FT      10 DEG. C LEVEL(S) : 12200 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS,
     STRONG OFFSHORE AND ON HIGH GROUND. CLOUDY WITH
     OCCASIONAL SQUALLY SHOWERS AND A FEW
     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 04:45 HKT on 12 Aug 18

    VHHK SIGMET 5 VALID 111650/112050 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1930 E11612 - N1642 E11400 - N1930 E11130 - N2130 E11130 - N2236 E11412 - N1930 E11612 TOP FL480 STNR NC= VHHK SIGMET 6 VALID 112050/120050 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2006 E11648 - N1642 E11400 - N1930 E11130 - N2130 E11130 - N2248 E11430 - N2006 E11648 TOP FL480 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 06:50 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 7 a.m., the tropical depression over the coastal waters of western Guangdong was estimated to be about 290 kilometres west-southwest of Hong Kong (near 21.1 degrees north 111.7 degrees east) and is forecast to move slowly, lingering around the seas off the coast of western Guangdong.

    The tropical depression over western Guangdong has moved from inland to the coastal waters during the overnight period. It is expected that the tropical depression will linger over the sea areas today. The Standby Signal, No. 1 will be in effect this morning.

    The track of the tropical depression is relatively erratic. The Observatory will continue to closely monitor its development and movement. Members of the public please take note of the latest information.

    The rainbands associated with the tropical depression will bring occasional heavy showers and squalls to Hong Kong today.

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

    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 06:30 HKT 12/Aug/2018


    Tropical Cyclone Warning

    At 112100 UTC, the tropical depression over the coastal waters of western Guangdong with central pressure 992 hectopascals was centred within 60 nautical miles of two one point two degrees north (21.2 N) one one one point five degrees east (111.5 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 122100 UTC
    Two zero point seven degrees north (20.7 N)
    One one two point six degrees east (112.6 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 132100 UTC
    Two one point two degrees north (21.2 N)
    One one three point zero degrees east (113.0 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 142100 UTC
    Two one point three degrees north (21.3 N)
    One one one point eight degrees east (111.8 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 152100 UTC
    Two zero point seven degrees north (20.7 N)
    One zero nine point zero degrees east (109.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 162100 UTC
    Two zero point five degrees north (20.5 N)
    One zero six point five degrees east (106.5 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 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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