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Bulletin issued at 16:02 HKT 15/Jul/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 84 per cent.
During the past hour the mean UV Index recorded at King's Park was 3. The intensity of UV radiation was moderate.

The subtropical ridge is covering southeastern China. Besides, the area of low pressure over the central part of the South China Sea has intensified into a tropical depression named Talas, and is bringing unsettled weather to the region. Talas is expected to move towards the southern part of Hainan Island and then into Beibu Wan today and tomorrow. It will keep at a distance of more than 500 kilometres from Hong Kong and will not directly affect the territory. However, under the combined effect of the subtropical ridge and Talas, it will be windier with squally showers over the northern part of the South China Sea on Saturday and Sunday. People out to the sea or engaging in water sports should take note of the weather changes.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 29 degrees;
Lau Fau Shan 33 degrees;
Tai Po 29 degrees;
Sha Tin 30 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 30 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 31 degrees;
Shek Kong 31 degrees;
Tsuen Wan Ho Koon 30 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 32 degrees;
Tai Mei Tuk 28 degrees.

Between 2:45 and 3:45 p.m., the rainfall recorded in various regions were:

North District 0 to 4 mm.

Here is the information on Tropical Depression Talas at 3 p.m.:
Location: 17.1 degrees north, 112.0 degrees east.


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


Climatological Information for 15 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 16:15 HKT 15/Jul/2017

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

The subtropical ridge is covering southeastern China.

Besides, the area of low pressure over the central part of the South China Sea has intensified into a tropical depression and was named Talas. At 4 p.m., Talas was centred about 270 kilometres east-southeast of Sanya. It is forecast to move west-northwest at about 16 kilometres per hour in the general direction of the southern part of Hainan Island.

Weather forecast for tonight and tomorrow

Cloudy with squally showers and a few thunderstorms. Temperatures will range between 26 and 30 degrees. Moderate to fresh east to southeasterly winds, occasionally strong offshore at first tomorrow.

Outlook : Still showery with a few thunderstorms in the following couple of days. The weather will improve gradually midweek next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 16/07/2017; 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 09:00 HKT 15/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 142100 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 150100 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. TEMP 31-26 C. =
KWANGTUNG= E TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2 M. =
TAIWAN STRAIT= SE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
BASHI= E TO SE 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
PRATAS= E TO SE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2 M. =
BALINTANG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
SCARBOROUGH= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
PARACEL= S TO SE 5-6, 6-7 IN N. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S 2 M. =
TONKIN= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL N 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 16:30 HKT 15/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 15 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    Besides, the area of low pressure over the central part of the South China Sea has intensified into a tropical depression and was named Talas. At 4 p.m., Tropical Depression Talas with maximum sustained winds of about 45 kilometres per hour near its centre was located at 17.1 degrees north, 111.8 degrees east, it is forecast to move west-northwest at about 16 kilometres per hour in the general direction of the southern part of Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to southeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East to southeast force 5 to 6, occasionally force 7.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Shangchuan Dao:
    East to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 5 to 6, cyclonic winds of force 7 in west at first. Frequent squally showers and thunderstorms.

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

    Waglan Island Wind east-southeast force 4
      Visibility 33 Kilometres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres in showers

    Dongsha Wind southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 3
      Visibility 1500 Metres in thunderstorms

    Xisha Wind south-southwest force 5
      Visibility 7 Kilometres in showers

  • 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 09:00 HKT 15/JUL/2017
    (Next update at 17:30 HKT 15/JUL/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 :
     AN EASTERLY AIRSTREAM IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.  MEANWHILE, A BROAD AREA OF
     LOW PRESSURE IS BRINGING UNSETTLED WEATHER TO
     THE CENTRAL PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  110/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  110/15-20, OCNL 25 LATER             29-33
   B.   2000 FT:  110/20-25                            25
   C.   5000 FT:  120/25                               19
   D.  10000 FT:  130/30                               12
   E.  18000 FT:  110/25                               MS2
   F.  24000 FT:  110/25                               MS13
   G.  30000 FT:  100/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS WITH A FEW SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 3000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EAST TO SOUTHEASTERLY WINDS, OCCASIONALLY
     STRONG OFFSHORE AND ON HIGH GROUND.  CLOUDY WITH
     SQUALLY SHOWERS AND A FEW 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 16:00 HKT on 15 Jul 17

    VHHK SIGMET 4 VALID 150500/150900 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1736 E11312 - N2106 E11618 - N2306 E11530 - N2342 E11730 - N2100 E11730 TOP FL370 MOV NW 10KT INTSF= VHHK SIGMET 5 VALID 150800/151200 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1912 E11142 - N2100 E11300 - N2300 E11512 - N2342 E11730 - N2100 E11730 TOP FL400 STNR INTSF=

    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 15:44 HKT 15/Jul/2017


    Tropical Cyclone Warning

    An area of low pressure over the central part of South China Sea has intensified into a Tropical Depression with central pressure 998 hectopascals and was named as Talas (1704) . At 150600 UTC, it was centred within 60 nautical miles of one seven point one degrees north (17.1 N) one one two point zero degrees east (112.0 E) and is forecast to move west-northwest at about 8 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 160600 UTC
    One eight point four degrees north (18.4 N)
    One zero eight point eight degrees east (108.8 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 170600 UTC
    One nine point one degrees north (19.1 N)
    One zero three point four degrees east (103.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 180600 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 15/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.8 C
Minimum Air Temperature                     27.4 C
Grass Minimum Temperature                   27.4 C
Relative Humidity                        70 - 93 Percent
Rainfall                                     2.3 mm 
Total rainfall since 1st January          1343.2 mm
Against an average of                     1246.9 mm

Other Stations                Min                  Max
King's Park                  26.4 C               32.7 C
Wong Chuk Hang               27.2 C               31.9 C
Ta Kwu Ling                  26.5 C               33.3 C
Lau Fau Shan                 26.1 C               32.4 C
Tai Po                       26.4 C               30.4 C
Sha Tin                      26.7 C               32.0 C
Tuen Mun                     26.9 C               32.0 C
Tseung Kwan O                26.2 C               31.9 C
Sai Kung                     26.5 C               31.6 C
Cheung Chau                  25.2 C               30.2 C
Chek Lap Kok                 28.3 C               34.4 C
Tsing Yi                     25.9 C               32.8 C
Shek Kong                    25.9 C               33.1 C
Tsuen Wan Ho Koon            25.0 C               31.1 C
Tsuen Wan Shing Mun Valley   25.7 C               32.2 C
Hong Kong Park               27.3 C               31.9 C
Shau Kei Wan                 26.2 C               31.0 C
Kowloon City                 26.2 C               32.2 C
Happy Valley                 28.3 C               32.2 C
Wong Tai Sin                 26.8 C               32.2 C
Stanley                      26.8 C               31.9 C
Kwun Tong                    26.4 C               30.4 C
Sham Shui Po                 26.4 C               32.5 C
Kai Tak Runway Park          27.4 C               31.3 C
Yuen Long Park               25.8 C               33.0 C
Tai Mei Tuk               26.6 C               32.4 C

Duration of sunshine (King's Park):              8.3 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 11.
 

Yesterday's (14 Jul 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                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
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                       0.12
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 14 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <15 Jul 2017> 

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