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Bulletin issued at 04:02 HKT 19/Aug/2016

At 4 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 90 per cent.

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 27 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 28 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 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees.

Here is the information on Tropical Storm Dianmu at 3 a.m.:
Location: 20.1 degrees north, 108.7 degrees east.


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


Climatological Information for 19 Aug

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 03:45 HKT 19/Aug/2016

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

The outer rainbands of Tropical Storm Dianmu are bringing squally showers to the vicinity of Pearl River Estuary and the northern part of the South China Sea.

At 2 a.m., Dianmu was centred about 330 kilometres east-southeast of Hanoi. It is forecast to move west at about 20 kilometres per hour crossing Beibu Wan.

Weather forecast for today

Mainly cloudy with occasional showers and squalls. Showers will ease off later. Temperatures will range between 26 and 30 degrees. Moderate to fresh southeasterly winds, occasionally strong offshore and on high ground at first. There will be swells.

Outlook : Sunny periods and isolated showers in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 19/08/2016; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 18/Aug/2016

GALE WARNING AREAS: KWANGTUNG AND TONKIN.

GENERAL SITUATION AT 180900 UTC:
FOR DETAILS ON TROPICAL STORM DIANMU (1608), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 181300 UTC:

HONG KONG= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-4 M. SWELL S TO SW 2 M. TEMP 26-30 C. =
KWANGTUNG= S TO SE 6-7, OCNL 8 IN W AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M IN W AT FIRST. SWELL S TO SW 2-3 M. =
TAIWAN STRAIT= S TO SE 4-5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SW 2 M. =
BASHI= S TO SW 5, OCNL 6 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
PRATAS= S 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. =
BALINTANG= S TO SW 5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
SCARBOROUGH= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
PARACEL= S TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
TONKIN= CYCLONIC 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL S 2 M. =
DANANG= W TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 03:30 HKT 19/Aug/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 19 August 2016

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 3 a.m., Tropical Storm Dianmu with maximum sustained winds of about 65 kilometres per hour near its centre was located near 20.1 degrees north, 108.7 degrees east. It is forecast to move west at about 20 kilometres per hour across Beibu Wan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 5 to 6, occasionally force 7 at first.
    Occasional squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    South to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong:
    South to southeast force 5 to 6, occasionally force 7 at first.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    South to southeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    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 southeast force 4
      Visibility 13 Kilometres

    Shantou Wind northeast force 1
      Visibility 15 Kilometres

    Dongsha Wind south force 1
      Visibility 10 Kilometres

    Huangmaozhou Wind southeast force 5

    Macau Wind south force 2
      Visibility 17 Kilometres

    Xisha Wind south force 4
      Visibility 10 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 01:30 HKT 19/AUG/2016
    (Next update at 9:00-9:30 HKT 19/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 OUTER RAINBANDS OF TROPICAL STORM DIANMU ARE
     BRINGING SQUALLY SHOWERS TO THE SOUTH CHINA
     COAST AND THE NORTHERN PART OF THE SOUTH CHINA
     SEA TODAY.
     AT 11 P.M. LAST NIGHT, DIANMU WAS CENTRED NEAR
     20.3 DEGREES NORTH, 109.4 DEGREES EAST, IT IS
     FORECAST TO MOVE WEST AT ABOUT 10 KNOTS ACROSS
     BEIBU WAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  140/15, OCNL 20
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  140/20-25, OCNL 30                   26-30
   B.   2000 FT:  140/20-25, OCNL 30                   22
   C.   5000 FT:  160/25                               20
   D.  10000 FT:  160/25                               12
   E.  18000 FT:  130/25                               MS1
   F.  24000 FT:  110/25                               MS11
   G.  30000 FT:  090/20                               MS27
   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 1500 FT  SCT 3000 FT  BKN 10000 FT.  TEMPO
      FEW CB 800 FT  SCT 2000 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) : 11000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHEASTERLY WINDS.  MAINLY
     CLOUDY WITH OCCASIONAL SQUALLY SHOWERS AND A FEW
     THUNDERSTORMS.  SHOWERS WILL EASE OFF LATER.=

    ===================================================================
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 02:58 HKT on 19 Aug 16

    VHHK SIGMET 12 VALID 181900/182300 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N1900 E11600 - N1900 E11200 TOP FL450 MOV W 10KT NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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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 03:30 HKT 19/Aug/2016


    Tropical Cyclone Warning

    At 181800 UTC, Tropical Storm Dianmu (1608) with central pressure 985 hectopascals was centred within 90 nautical miles of two zero point zero degrees north (20.0 N) one zero eight point seven degrees east (108.7 E) and is forecast to move west at about 10 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 191800 UTC
    Two zero point four degrees north (20.4 N)
    One zero four point four degrees east (104.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 201800 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 19/Aug/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     25.9 C
Grass Minimum Temperature                   25.3 C
Relative Humidity                        89 - 98 Percent
Rainfall                                    50.9 mm 
Total rainfall since 1st January          1874.8 mm
Against an average of                     1727.8 mm

Other Stations                Min                  Max
King's Park                  25.3 C               29.2 C
Wong Chuk Hang               25.9 C               29.2 C
Ta Kwu Ling                  25.8 C               29.9 C
Lau Fau Shan                 25.2 C               29.3 C
Tai Po                       25.6 C               27.9 C
Sha Tin                      26.4 C               29.8 C
Tuen Mun                     25.9 C               29.1 C
Tseung Kwan O                25.7 C               28.1 C
Sai Kung                     25.6 C               28.6 C
Cheung Chau                  25.0 C               26.9 C
Chek Lap Kok                 26.5 C               30.6 C
Tsing Yi                     26.0 C               29.9 C
Shek Kong                    25.8 C               30.3 C
Tsuen Wan Ho Koon            24.9 C               26.8 C
Tsuen Wan Shing Mun Valley   25.6 C               29.6 C
Hong Kong Park               25.6 C               29.0 C
Shau Kei Wan                 25.2 C               28.3 C
Kowloon City                 25.4 C               29.1 C
Happy Valley                 26.3 C               30.5 C
Wong Tai Sin                 25.6 C               28.8 C
Stanley                      25.6 C               29.0 C
Kwun Tong                    25.8 C               28.7 C
Sham Shui Po                 25.8 C               29.6 C
Kai Tak Runway Park          25.8 C               28.9 C
Yuen Long Park               26.0 C               31.0 C

Duration of sunshine (King's Park):              1.3 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 7.
Sea surface temperature (Waglan Island):        26.1 C 

Yesterday's (18 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                         0.15
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 18 Aug
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