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Bulletin issued at 11:16 HKT 18/Aug/2016

At 11 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 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 was issued at 11:15 a.m.

The air temperatures at other places were:

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

Between 9:45 and 10:45 a.m., the rainfall recorded in various regions were:

Islands District 0 to 8 mm;
North District 0 to 2 mm;
Tai Po 0 to 2 mm;
Tuen Mun 0 to 2 mm;
Tsuen Wan 0 to 1 mm.

Here is the information on Tropical Storm Dianmu:
Location: 21.1 degrees north, 111.5 degrees east; Maximum sustained wind near its centre: 65 km/h.


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


Climatological Information for 18 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 11:20 HKT 18/Aug/2016

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

Weather forecast for today

Cloudy with squally showers. There will be swells. Moderate to fresh south to southeasterly winds, occasionally strong offshore and on high ground at first.

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


(The above forecast period is valid up to 23:59 HKT today, 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 09:00 HKT 18/Aug/2016

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

GENERAL SITUATION AT 172100 UTC:
FOR DETAILS ON TROPICAL STORM OVER THE COASTAL WATERS OF WESTERN GUANGDONG, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 180100 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 2-3 M. TEMP 29-27 C. =
KWANGTUNG= CYCLONIC 8-9, BEC S TO SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 8 M AT FIRST. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M. SWELL SW 2 M. =
BASHI= S TO SW 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL SW 2-3 M. =
PRATAS= S TO SW 6-7, OCNL 8 AT FIRST. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL S TO SW 2-3 M. =
BALINTANG= S TO SW 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M AT FIRST. SWELL SW 2-3 M. =
SCARBOROUGH= S TO SW 6-7, OCNL 8 AT FIRST. DOWN TO 1000 M IN OCNL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL S TO SW 2-3 M. =
PARACEL= SW 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 2-3 M. =
TONKIN= W TO NW 7-8, BEC CYCLONIC 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 8 M LATER. SWELL S 2 M. =
DANANG= W TO SW 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-6 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • 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 10:00 HKT 18/Aug/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:00 a.m. on 18 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:
    The tropical storm over the coastal waters of western Guangdong was named Dianmu. At 10 a.m., Dianmu with maximum sustained winds of about 65 kilometres per hour near its centre was located at 21.1 degrees north, 111.7 degrees east, it is forecast to move west at about 15 kilometres per hour towards the vicinity of Beibu Wan.

    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.
    Scattered 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 7 to 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, up to force 8 in west at first. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind south-southeast force 4
      Visibility 11 Kilometres

    Shantou Wind northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 4
      Visibility 8 Kilometres in rain

    Huangmaozhou Wind south-southeast force 5

    Macau Wind south-southeast force 3
      Visibility 11 Kilometres

    Xisha Wind south-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 10:00 HKT 18/AUG/2016
    (Next update at 17:30 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 :
     THE TROPICAL STORM OVER THE COASTAL WATERS OF
     WESTERN GUANGDONG WAS NAMED DIANMU. AT 10 A.M.,
     DIANMU WAS CENTRED NEAR 21.1 DEGREES NORTH 111.7
     DEGREES EAST. IT IS FORECAST TO MOVE WEST AT
     ABOUT 8 KNOTS IN THE GENERAL DIRECTION OF BEIBU
     WAN..
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/20-25
                  140/15 LATER
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/25-30                            26-29
   B.   2000 FT:  150/25-30                            24
   C.   5000 FT:  160/30-35                            20
   D.  10000 FT:  160/35-40                            13
   E.  18000 FT:  140/45
                  BECMG 140/30                         0
   F.  24000 FT:  100/60
                  BECMG 100/45                         MS7
   G.  30000 FT:  100/40                               MS21
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SQUALLY SHOWERS AND A FEW ISOLATED
      THUNDERSTORMS. SHOWERS WILL BE HEAVY AT TIMES
      AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT  BKN 8000 FT.  
      TEMPO FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 2500 M IN SHOWERS.  
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND AT LOW LEVELS.
   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
     AT FIRST.  CLOUDY WITH SQUALLY SHOWERS AND A FEW
     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 10:35 HKT on 18 Aug 16

    VHHK SIGMET 5 VALID 180235/180635 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N1800 AND S OF N2200 TOP FL450 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 11:20 HKT 18/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 11 a.m., Tropical Storm Dianmu was estimated to be about 310 kilometres west-southwest of Hong Kong (near 21.1 degrees north 111.5 degrees east) and is forecast to move west at about 15 kilometres per hour in the general direction of Beibu Wan.

    As Dianmu moves progressively away from Hong Kong, local winds will moderate gradually. However, winds will remain strong offshore and on high ground at first. When local winds subside further in the afternoon, the Observatory will cancel all Tropical Cyclone Warning Signals. As there are swells, members of the public should stay away from the shoreline and not to engage in water sports.

    In the past hour, the maximum sustained winds recorded at Ngong Ping were 49 kilometres per hour.

    (Precautionary Announcements with No. 1 Signal)

    1. 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
    Current Weather |  Local Weather Forecast |  9-day Weather Forecast
    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 10:45 HKT 18/Aug/2016


    Tropical Cyclone Warning

    At 180000 UTC, the tropical storm Dianmu (1608) with central pressure 985 hectopascals was centred within 90 nautical miles of two one point zero degrees north (21.0 N) one one one point eight degrees east (111.8 E) and is forecast to move west at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 60 nautical miles over southern semicircle, 30 nautical miles elsewhere.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 190000 UTC
    Two zero point six degrees north (20.6 N)
    One zero seven point eight degrees east (107.8 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 200000 UTC
    Two zero point five degrees north (20.5 N)
    One zero three point zero degrees east (103.0 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 210000 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 18/Aug/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.0 C
Minimum Air Temperature                     25.3 C
Grass Minimum Temperature                   25.5 C
Relative Humidity                        91 - 98 Percent
Rainfall                                    40.9 mm 
Total rainfall since 1st January          1823.9 mm
Against an average of                     1719.2 mm

Other Stations                Min                  Max
King's Park                  24.6 C               28.6 C
Wong Chuk Hang               25.5 C               28.6 C
Ta Kwu Ling                  25.7 C               28.9 C
Lau Fau Shan                 24.9 C               29.7 C
Tai Po                       25.0 C               27.8 C
Sha Tin                      25.5 C               29.6 C
Tuen Mun                     25.6 C               29.2 C
Tseung Kwan O                25.0 C               27.9 C
Sai Kung                     25.2 C               28.3 C
Cheung Chau                  24.8 C               27.2 C
Chek Lap Kok                 25.9 C               30.4 C
Tsing Yi                     25.4 C               29.8 C
Shek Kong                    25.8 C               28.6 C
Tsuen Wan Ho Koon            24.5 C               27.6 C
Tsuen Wan Shing Mun Valley   25.3 C               28.8 C
Hong Kong Park               24.8 C               27.3 C
Shau Kei Wan                 24.7 C               27.5 C
Kowloon City                 24.8 C               28.9 C
Happy Valley                 25.7 C               28.6 C
Wong Tai Sin                 25.1 C               28.4 C
Stanley                      25.0 C               27.9 C
Kwun Tong                    25.3 C               28.6 C
Sham Shui Po                 25.5 C               30.3 C
Kai Tak Runway Park          25.8 C               28.6 C
Yuen Long Park               25.5 C               29.9 C

Duration of sunshine (King's Park):              0.8 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 6.
Sea surface temperature (Waglan Island):        26.2 C 

Yesterday's (17 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 17 Aug
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