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Bulletin issued at 22:26 HKT 13/Jun/2017

At 10 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 86 per cent.

Please be reminded that:

The Thunderstorm Warning was issued at 10:25 p.m. It will remain effective until 12:30 a.m. tomorrow. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 28 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 28 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 27 degrees.

Between 8:45 and 9:45 p.m., the rainfall recorded in various regions were:

Islands District 0 to 2 mm;
Kwai Tsing 0 to 1 mm.


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


Climatological Information for 13 Jun

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 22:15 HKT 13/Jun/2017

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

A southwesterly airstream is bringing showers to the coast of Guangdong.

Besides, Tropical Depression Merbok has weakened into an area of low pressure over Fujian.

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. There will be isolated thunderstorms tonight and tomorrow morning. Sunny intervals in the afternoon. Temperatures will range between 27 and 31 degrees. Moderate southwesterly winds, occasionally fresh.

Outlook : Sunny intervals on Thursday. Showers and thunderstorms in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 14/06/2017; 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 13/Jun/2017

GALE WARNING AREA: TAIWAN STRAIT.

GENERAL SITUATION AT 130900 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 131300 UTC:

HONG KONG= SW 4-5, OCNL 6. ISOL SHOWERS AND TS. SEA UP TO 3 M. SWELL SW UP TO 2 M. TEMP 26-31 C. =
KWANGTUNG= SW 5-6, OCNL 7 IN E. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
TAIWAN STRAIT= SW 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL SW 2-3 M. =
BASHI= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
PRATAS= SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
BALINTANG= SW 5-6. ISOL SHOWERS. SEA 2-3 M. SWELL SW 2-3 M. =
SCARBOROUGH= S TO SW 5-6. FINE. SEA 2-3 M. SWELL SW UP TO 2 M. =
PARACEL= S TO SW 5-6. FINE. SEA 2-3 M. SWELL SW UP TO 2 M. =
TONKIN= S TO SW 5. ISOL SHOWERS AND TS. SEA 2 M. =
DANANG= S TO SW 5. ISOL SHOWERS AND TS. SEA 2 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 19:30 HKT 13/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 13 June 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A southwesterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southwest force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Rough seas.

    Nan'ao:
    Southwest force 5 to 6, occasionally force 7.
    Isolated showers and thunderstorms.
    Rough seas.

    Shanwei and South of Hong Kong:
    Southwest force 5 to 6.
    Isolated showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    Southwest force 5 to 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Southwesterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 2
      Visibility 16 Kilometres

    Shantou Wind south-southwest force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 3

    Macau Wind south-southwest force 2
      Visibility 25 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 14 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 13/JUN/2017
    (Next update at 01:30 HKT 14/JUN/2017)
    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 :
     A SOUTHWESTERLY AIRSTREAM IS AFFECTING THE COAST
     OF GUANGDONG.
     AT 4 P.M., TROPICAL DEPRESSION MERBOK WAS
     CENTRED NEAR 25.2 DEGREES NORTH 115.9 DEGREES
     EAST AND IS FORECAST TO MOVE NORTHEAST AT ABOUT
     8 KNOTS ACROSS THE SOUTHEASTERN PART OF CHINA
     AND DISSIPATE GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  210/10-15
                  TEMPO VRB/25G35 IN TS
       OFFSHORE:  210/20 OCNL 25                       28-25
   B.   2000 FT:  190/20 OCNL 25                       23
   C.   5000 FT:  240/20                               19
   D.  10000 FT:  240/15                               12
   E.  18000 FT:  300/10                               MS3
   F.  24000 FT:  040/15                               MS12
   G.  30000 FT:  040/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SHOWERS AND A FEW ISOLATED
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT  BKN 8000 FT.  TEMPO
      FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM.  TEMPO 3500 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTHWESTERLY WINDS.  MAINLY
     CLOUDY WITH A FEW SHOWERS AND 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.

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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 15:18 HKT on 13 Jun 17

    VHHK SIGMET 1 VALID 130330/130730 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2200 E11236 - N2230 E11342 - N2336 E11718 - N2154 E11648 - N2018 E11500 - N2018 E11336 - N2200 E11236 TOP FL420 MOV NE 10KT NC= VHHK SIGMET 2 VALID 130730/131130 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2130 E11136 - N2230 E11342 - N2342 E11730 - N2242 E11730 - N2100 E11548 - N2048 E11218 - N2130 E11136 TOP FL420 MOV NNE 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

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    Bulletin issued at 12:30 HKT 13/Jun/2017


    Tropical Cyclone Warning

    Tropical Storm Merbok (1702) has weakened into a Tropical Depression with central pressure 998 hectopascals. At 130300 UTC, it was centred within 60 nautical miles of two four point three degrees north (24.3 N) one one five point one degrees east (115.1 E) and is forecast to move north-northeast at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 60 nautical miles.

    No further warnings on this Tropical Depression will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 140300 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 13/Jun/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.0 C
Minimum Air Temperature                     25.3 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        76 - 98 Percent
Rainfall                                    37.7 mm 
Total rainfall since 1st January           576.9 mm
Against an average of                      829.1 mm

Other Stations                Min                  Max
King's Park                  25.0 C               30.9 C
Wong Chuk Hang               25.1 C               30.5 C
Ta Kwu Ling                  25.0 C               31.9 C
Lau Fau Shan                 25.2 C               30.3 C
Tai Po                       24.8 C               29.5 C
Sha Tin                      25.9 C               31.6 C
Tuen Mun                     25.4 C               32.0 C
Tseung Kwan O                25.1 C               31.1 C
Sai Kung                     25.4 C               30.5 C
Cheung Chau                  25.0 C               31.3 C
Chek Lap Kok                 26.1 C               32.9 C
Tsing Yi                     25.7 C               31.7 C
Shek Kong                    25.4 C               30.8 C
Tsuen Wan Ho Koon            24.5 C               29.5 C
Tsuen Wan Shing Mun Valley   24.8 C               30.8 C
Hong Kong Park               25.1 C               31.1 C
Shau Kei Wan                 24.7 C               30.3 C
Kowloon City                 24.9 C               30.8 C
Happy Valley                 25.7 C               31.6 C
Wong Tai Sin                 24.8 C               29.6 C
Stanley                      25.4 C               30.2 C
Kwun Tong                    25.0 C               30.6 C
Sham Shui Po                 25.7 C               31.8 C
Kai Tak Runway Park          25.7 C               30.5 C
Yuen Long Park               25.3 C               31.2 C
Tai Mei Tuk               24.7 C               31.1 C

Duration of sunshine (King's Park):              4.4 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
Sea surface temperature (Waglan Island):        26.4 C 

Yesterday's (12 Jun 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
Tap Mun                             0.09
Kat O                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, 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 12 Jun
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