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Bulletin issued at 04:02 HKT 21/Jun/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 94 per cent.

Announcement on Localised Heavy Rain: More than 70 millimetres of rainfall were recorded in Sai Kung District in the past 1 hour ending at 2:15 a.m. and may cause serious flooding.

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

Gusts reaching 70 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 6:00 a.m. today. Squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 26 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 25 degrees;
Tai Po 25 degrees;
Sha Tin 26 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 25 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 26 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 26 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 25 degrees;
Stanley 27 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 25 degrees.

Between 2:45 and 3:45 a.m., lightning was detected within New Territories East, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Islands District 0 to 4 mm;
Sai Kung 0 to 3 mm.


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


Climatological Information for 21 Jun

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 03:45 HKT 21/Jun/2017

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

A trough of low pressure is bringing showers and thunderstorms to the coast of Guangdong. Locally, heavy showers after midnight brought more than 30 millimetres of rainfall to the urban areas and New Territories East, and rainfall even exceeded 70 millimetres over Sai Kung.

Weather forecast for today

Mainly cloudy with showers. Showers will be heavy at times at first with squally thunderstorms. Showers will ease off gradually later. Temperatures will range between 25 and 30 degrees. Moderate south to southwesterly winds, occasionally fresh offshore.

Outlook : Hot with sunny periods in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 21/06/2017; 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 20/Jun/2017

N0 WARNING.

GENERAL SITUATION AT 200900 UTC:
TROUGH 22N 107E 25N 115E 30N 125E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. TEMP 26-30 C. =
KWANGTUNG= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SW UP TO 2 M. =
TAIWAN STRAIT= SW 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW UP TO 2 M. =
BASHI= S TO SW 4-5, OCNL 6. FINE. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PRATAS= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS IN N. SEA UP TO 3 M. SWELL SW UP TO 2 M. =
BALINTANG= S TO SW 4-5. FINE. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
SCARBOROUGH= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SW UP TO 2 M. =
PARACEL= S TO SW 4-5, OCNL 6. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS IN N. SEA UP TO 3 M. SWELL SW UP TO 2 M. =
TONKIN= S 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
DANANG= S 4-5, OCNL 6. DOWN TO 2000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 03:30 HKT 21/Jun/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 21 June 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    The unsettled weather associated with a trough of low pressure is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southwest force 4 to 5, occasionally force 6.
    Scattered heavy squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South to southwest force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Southerly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind west-southwest force 4
      Visibility 6 Kilometres

    Shantou Wind southeast force 1
      Visibility 30 Kilometres

    Dongsha Wind south force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 4

    Macau Wind south-southwest force 1
      Visibility 11 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 21 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 21/JUN/2017
    (Next update at 9:00-9:30 HKT 21/JUN/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     SHOWERS AND THUNDERSTORMS ASSOCIATED WITH A
     TROUGH OF LOW PRESSURE ARE AFFECTING THE COAST
     OF GUANGDONG AND THE NORTHERN PART OF THE SOUTH
     CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  220/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  210/10-15, OCNL 20 LATER             24-30
   B.   2000 FT:  210/20                               23
   C.   5000 FT:  220/25                               19
   D.  10000 FT:  220/25                               11
   E.  18000 FT:  240/25                               MS4
   F.  24000 FT:  280/20                               MS13
   G.  30000 FT:  250/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS AND SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 8000 FT.  TEMPO
      FEW CB 800 FT  SCT  1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. MOD OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHWESTERLY WINDS, FRESH AT
     TIMES.  MAINLY CLOUDY WITH 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 04:30 HKT on 21 Jun 17

    VHHK SIGMET 7 VALID 202030/202330 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2230 E11342 - N2230 E11342 - N2342 E11730 - N2212 E11730 - N2036 E11324 - N2230 E11342 TOP FL400 MOV NE 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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




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

    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 21/Jun/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.2 C
Minimum Air Temperature                     25.2 C
Grass Minimum Temperature                   24.6 C
Relative Humidity                        80 - 98 Percent
Rainfall                                    24.8 mm 
Total rainfall since 1st January          1059.5 mm
Against an average of                      944.7 mm

Other Stations                Min                  Max
King's Park                  25.1 C               28.0 C
Ta Kwu Ling                  24.2 C               28.3 C
Lau Fau Shan                 24.6 C               27.1 C
Tai Po                       24.5 C               27.5 C
Sha Tin                      24.8 C               28.2 C
Tuen Mun                     24.9 C               27.1 C
Tseung Kwan O                24.4 C               27.6 C
Sai Kung                     25.0 C               27.6 C
Cheung Chau                  24.8 C               26.9 C
Chek Lap Kok                 25.7 C               30.1 C
Tsing Yi                     24.7 C               27.3 C
Shek Kong                    24.5 C               28.5 C
Tsuen Wan Ho Koon            23.9 C               25.8 C
Tsuen Wan Shing Mun Valley   24.3 C               26.9 C
Hong Kong Park               24.5 C               27.9 C
Shau Kei Wan                 24.7 C               28.3 C
Kowloon City                 24.8 C               27.5 C
Happy Valley                 24.7 C               28.3 C
Wong Tai Sin                 24.3 C               27.5 C
Stanley                      24.7 C               27.0 C
Kwun Tong                    24.9 C               28.0 C
Sham Shui Po                 25.0 C               27.4 C
Kai Tak Runway Park          25.3 C               28.5 C
Yuen Long Park               24.5 C               27.8 C
Tai Mei Tuk               24.6 C               26.8 C

Duration of sunshine (King's Park):              0.2 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 (20 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                           0.12
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 20 Jun
     2003copy right image | Important notices | Privacy policy Last revision date: <21 Jun 2017> 

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