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Bulletin issued at 21:02 HKT 17/Aug/2016

At 9 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 97 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 26 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 26 degrees;
Tai Po 26 degrees;
Sha Tin 27 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 27 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 26 degrees;
Stanley 26 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 27 degrees.

Between 7:45 and 8:45 p.m., the rainfall recorded in various regions were:

Tsuen Wan 0 to 10 mm;
Tuen Mun 4 to 9 mm;
Tai Po 0 to 6 mm;
Yuen Long 0 to 6 mm;
Sha Tin 0 to 4 mm;
North District 0 to 2 mm;
Eastern District 0 to 2 mm;
Southern District 0 to 2 mm;
Sai Kung 0 to 2 mm;
Kwai Tsing 0 to 2 mm.

Here is the information on Tropical Depression:
Location: 20.7 degrees north, 112.6 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 17 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 20:45 HKT 17/Aug/2016

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

Weather forecast for tonight and tomorrow

Cloudy with squally showers. Showers will be heavy at times tonight and tomorrow morning. Moderate to fresh south to southeasterly winds, occasionally strong offshore and on high ground. Winds will strengthen gradually. There will be swells. Temperatures will range between 26 and 29 degrees.

Outlook : Still showery on Friday. Showers will ease off over the weekend.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/08/2016; 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 17/Aug/2016

GALE WARNING AREAS: KWANGTUNG, PRATAS, SCARBOROUGH, PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 170900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER THE COASTAL WATERS OF WESTERN GUANGDONG, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 171300 UTC:

HONG KONG= S TO SE 6-7. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2 M, UP TO 3 M LATER. TEMP 26-29 C. =
KWANGTUNG= S TO SE 6-7, CYCLONIC UP TO 8 IN W. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M, UP TO 3 M LATER. =
BASHI= S TO SW 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= 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 2-3 M. =
BALINTANG= S TO SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
SCARBOROUGH= S TO SW 6-7, OCNL 8. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S TO SW 2-3 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 2-3 M. =
TONKIN= W TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL S 2 M. =
DANANG= W TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 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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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 19:30 HKT 17/Aug/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 17 August 2016

    Warnings:
    Gale force winds in Shanwei, south of Hong Kong and Shangchuan Dao. Strong winds in Hong Kong adjacent waters and Nan'ao.

    Weather Situation:
    At 7 p.m., the tropical depression over the coastal waters of western Guangdong with maximum sustained winds of about 55 kilometres per hour near its centre was located at 20.7 degrees north, 112.6 degrees east, it is forecast to move west slowly towards the vicinity of Leizhou and intensify gradually.

    Area forecasts for the next 24 hours

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

    Nan'ao:
    South to southeast force 6 to 7.
    Occasional heavy squally showers and thunderstorms.
    Rough seas.

    Shanwei and South of Hong Kong:
    South to southeast force 6 to 7, occasionally force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very 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 5 to 6, force 7 to 8 at first. Occasional heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 4
      Visibility 16 Kilometres

    Shantou Wind east force 3
      Visibility 30 Kilometres

    Dongsha Wind south force 4
      Visibility 8 Kilometres in rain

    Huangmaozhou Wind southeast force 5

    Macau Wind northeast force 3
      Visibility 15 Kilometres

    Xisha Wind southwest force 6
      Visibility 15 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
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 17/AUG/2016
    (Next update at 01:30 HKT 18/AUG/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.
     CUNIM/TS AND ASSOCIATED HAZARDS.

II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., THE TROPICAL DEPRESSION OVER THE
     COASTAL WATERS OF WESTERN GUANGDONG WAS CENTRED
     NEAR 20.8 DEGREES NORTH 112.7 DEGREES EAST.  IT
     IS FORECAST TO MOVE WEST SLOWLY IN THE GENERAL
     DIRECTION OF LEIZHOU AND INTENSIFY GRADUALLY.

III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/15 BEC 140/20-25
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  100/20-25 BEC 160/25-30              29-25
   B.   2000 FT:  080/20-25 BEC 140/25-30              23
   C.   5000 FT:  140/30                               20
   D.  10000 FT:  140/30                               13
   E.  18000 FT:  110/30                               0
   F.  24000 FT:  100/40                               MS8
   G.  30000 FT:  090/40                               MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND A FEW
      THUNDERSTORMS.  SHOWERS WILL BE HEAVY AT TIMES
      LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT  BKN 8000 FT.  TEMPO
      FEW CB 800 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: 18000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 26 DEG

IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTH TO SOUTHEASTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND.
     CLOUDY WITH SQUALLY SHOWERS AND A FEW
     THUNDERSTORMS.  SHOWERS WILL BE HEAVY AT TIMES
     AT FIRST.=

    ===================================================================
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 19:15 HKT on 17 Aug 16

    VHHK SIGMET 5 VALID 171115/171515 VHHH- VHHK HONG KONG FIR EMBD TS FCST S OF LINE N2100 E11130 - N2230 E11730 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 20:45 HKT 17/Aug/2016

    Tropical Cyclone Bulletin

    Here is the latest Tropical Cyclone 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 p.m., the tropical depression over the coastal waters of western Guangdong was estimated to be about 240 kilometres southwest of Hong Kong (near 20.7 degrees north 112.6 degrees east). It is forecast to move west slowly in the general direction of Leizhou and intensify gradually.

    The Tropical Depression is expected to intensify gradually, and winds over Hong Kong will strengthen progressively overnight. The Observatory will issue the Strong Wind Signal No. 3 before midnight.

    (Precautionary Announcements with No. 1 Signal)

    1. Since there are swells, you are advised to stay away from the shoreline and not to engage in water sports.

    2. People living in wooden huts and in low-lying areas should take necessary precautions against strong winds and flooding.

    3. If you are planning to visit Guangdong, Macau, any of the off-shore islands or remote parts of Hong Kong, you are reminded that changes in weather may affect your plans.

    4. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for 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 21:30 HKT 17/Aug/2016


    Tropical Cyclone Warning

    At 171200 UTC, the tropical depression over the coastal waters of western Guangdong with central pressure 990 hectopascals was centred within 90 nautical miles of two zero point seven degrees north (20.7 N) one one two point six degrees east (112.6 E) and is forecast to move west slowly 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 181200 UTC
    Two zero point eight degrees north (20.8 N)
    One zero nine point seven degrees east (109.7 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 191200 UTC
    Two zero point five degrees north (20.5 N)
    One zero five point six degrees east (105.6 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 201200 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 17/Aug/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.9 C
Minimum Air Temperature                     25.5 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        89 - 98 Percent
Rainfall                                    49.9 mm 
Total rainfall since 1st January          1783.0 mm
Against an average of                     1707.4 mm

Other Stations                Min                  Max
King's Park                  25.0 C               26.9 C
Wong Chuk Hang               25.4 C               28.2 C
Ta Kwu Ling                  25.1 C               29.0 C
Lau Fau Shan                 25.0 C               28.0 C
Tai Po                       25.1 C               26.9 C
Sha Tin                      25.2 C               27.8 C
Tuen Mun                     25.3 C               27.6 C
Tseung Kwan O                25.0 C               26.4 C
Sai Kung                     25.3 C               27.0 C
Cheung Chau                  24.9 C               26.5 C
Chek Lap Kok                 25.7 C               28.6 C
Tsing Yi                     25.3 C               28.0 C
Shek Kong                    25.2 C               27.5 C
Tsuen Wan Ho Koon            24.7 C               27.0 C
Tsuen Wan Shing Mun Valley   25.0 C               27.9 C
Hong Kong Park               25.0 C               26.3 C
Shau Kei Wan                 24.9 C               26.8 C
Kowloon City                 25.0 C               27.5 C
Happy Valley                 25.4 C               28.1 C
Wong Tai Sin                 25.3 C               27.2 C
Stanley                      25.1 C               26.6 C
Kwun Tong                    25.2 C               27.5 C
Sham Shui Po                 25.4 C               27.8 C
Kai Tak Runway Park          25.4 C               27.6 C
Yuen Long Park               25.4 C               27.7 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.
Sea surface temperature (Waglan Island):        26.5 C 

Yesterday's (16 Aug 2016) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                           0.08
Tap Mun                             0.09
Kat O                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.10
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2015, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 16 Aug
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