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

At 4 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 90 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

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 p.m. today. A few squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 28 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 27 degrees;
Stanley 28 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

Between 2:45 and 3:45 p.m., lightning was detected within New Territories East and New Territories West. The rainfall recorded in various regions were:

Tai Po 0 to 9 mm;
North District 0 to 8 mm;
Yuen Long 0 to 1 mm.

Here is the information on Tropical Storm Talas at 4 p.m.:
Location: 18.2 degrees north, 108.0 degrees east.


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


Climatological Information for 16 Jul

Regional Weather in Hong Kong

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

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

Under the combined effect of the subtropical ridge and Tropical Cyclone Talas, there are thundery showers over the northern part of the South China Sea and the coast of Guangdong. Locally, more than 20 millimetres of rainfall were generally recorded over the territory.

At 4 p.m., Tropical Storm Talas was centred about 170 kilometres west of Sanya. It is forecast to move west or west-northwest at about 25 kilometres per hour across Beibu Wan towards northern Vietnam.

Weather forecast for tonight and tomorrow

Cloudy with showers and a few squally thunderstorms. Temperatures will range between 26 and 29 degrees. Moderate to fresh east to southeasterly winds.

Outlook : Still showery with a few squally thunderstorms on Tuesday. The weather will improve in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 17/07/2017; 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 16/Jul/2017

GALE WARNING AREAS: PARACEL, TONKIN AND DANANG.

GENERAL SITUATION AT 152100 UTC:
FOR DETAILS ON TROPICAL STORM TALAS (1704), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 160100 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. TEMP 29-26 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= S TO 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 2000 M IN SCT 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 TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
PARACEL= SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL S 2-3 M. =
TONKIN= NE 7-8, BEC CYCLONIC 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 6-8 M. SWELL N 2-3 M. =
DANANG= CYCLONIC 8-9, BEC SE 7-8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, BEC 4-6 M. SWELL N 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.


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    • SOUTH CHINA COASTAL WATERS
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    Bulletin issued at 16:30 HKT 16/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 16 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 4 p.m., Tropical Storm Talas with maximum sustained winds of about 85 kilometres per hour near its centre was located at 18.2 degrees north, 108.0 degrees east. It is forecast to move west or west-northwest at about 25 kilometres per hour across Beibu Wan towards northern Vietnam.

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

    Outlook for the next 48 hours
    South to southeasterly winds of force 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 4
      Visibility 13 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind east-southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 5

    Macau Wind east force 2
      Visibility 21 Kilometres

    Xisha Wind south-southeast force 2
      Visibility 18 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 16/JUL/2017
    (Next update at 17:30 HKT 16/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 COASTAL
     AREAS OF GUANGDONG.
     AT 8 A.M., TROPICAL STORM TALAS WAS LOCATED AT
     17.5 DEGREES NORTH, 109.5 DEGREES EAST. IT IS
     FORECAST TO MOVE WEST OR WEST-NORTHWEST AT ABOUT
     10 KNOTS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  110/20-25                            29-32
   B.   2000 FT:  120/25-30                            24
   C.   5000 FT:  120/25                               18
   D.  10000 FT:  110/20                               11
   E.  18000 FT:  120/30                               MS2
   F.  24000 FT:  100/20                               MS14
   G.  30000 FT:  120/25                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SQUALLY SHOWERS AND A FEW
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 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: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, 
                      OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO SOUTHEASTERLY WINDS.
     MAINLY 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 13:00 HKT on 16 Jul 17

    VHHK SIGMET 1 VALID 160130/160500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11130 - N2124 E11130 - N2230 E11342 - N2018 E11400 - N1954 E11130 TOP FL400 MOV NW 20KT NC= VHHK SIGMET 2 VALID 160500/160900 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2048 E11718 - N1818 E11518 - N2036 E11130 - N2124 E11130 - N2218 E11318 - N2236 E11412 - N2048 E11718 TOP FL400 MOV NW 20KT NC=

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    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 15:30 HKT 16/Jul/2017


    Tropical Cyclone Warning

    At 160600 UTC, Tropical Storm Talas (1704) with central pressure 988 hectopascals was centred within 60 nautical miles of one eight point one degrees north (18.1 N) one zero eight point three degrees east (108.3 E) and is forecast to move west or west-northwest at about 14 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 45 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 170600 UTC
    One nine point one degrees north (19.1 N)
    One zero two point three degrees east (102.3 E)
    Maximum winds 30 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.

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    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 16/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.1 C
Minimum Air Temperature                     27.0 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        75 - 94 Percent
Rainfall                                     8.8 mm 
Total rainfall since 1st January          1352.0 mm
Against an average of                     1261.9 mm

Other Stations                Min                  Max
King's Park                  26.6 C               32.3 C
Wong Chuk Hang               26.4 C               31.6 C
Ta Kwu Ling                  25.8 C               32.2 C
Lau Fau Shan                 25.8 C               33.5 C
Tai Po                       26.1 C               30.1 C
Sha Tin                      26.5 C               32.1 C
Tuen Mun                     26.4 C               32.8 C
Tseung Kwan O                26.3 C               31.8 C
Sai Kung                     26.5 C               30.7 C
Cheung Chau                  25.2 C               29.8 C
Chek Lap Kok                 26.9 C               34.5 C
Tsing Yi                     26.3 C               32.6 C
Shek Kong                    26.6 C               32.5 C
Tsuen Wan Ho Koon            25.9 C               31.1 C
Tsuen Wan Shing Mun Valley   27.0 C               32.3 C
Hong Kong Park               25.6 C               31.2 C
Shau Kei Wan                 24.5 C               30.8 C
Kowloon City                 25.9 C               31.6 C
Happy Valley                 26.9 C               31.5 C
Wong Tai Sin                 26.8 C               31.7 C
Stanley                      25.6 C               31.6 C
Kwun Tong                    26.5 C               30.7 C
Sham Shui Po                 26.5 C               32.5 C
Kai Tak Runway Park          25.3 C               31.1 C
Yuen Long Park               26.6 C               33.4 C
Tai Mei Tuk               26.1 C               30.5 C

Duration of sunshine (King's Park):              5.1 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 12.
 

Yesterday's (15 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                         0.11
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 15 Jul
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