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Bulletin issued at 00:36 HKT 17/Jul/2017

At midnight at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 84 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 3:00 a.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Here is the information on Severe Tropical Storm Talas at 11:00 p.m. yesterday:
Location: 18.6 degrees north, 106.5 degrees east.


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


Climatological Information for 17 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:00 HKT 17/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 were thundery showers over the northern part of the South China Sea and the coast of Guangdong yesterday. Locally, it was mainly cloudy with showers and a few squally thunderstorms. More than 20 millimetres of rainfall were generally recorded over the territory. There will still be thundery showers over the northern part of the South China Sea and the coast of Guangdong today. As the subtropical ridge strengthens gradually, the weather will improve over the coast of Guangdong in the middle and latter parts of this week.

Talas intensified gradually from a tropical depression into a severe tropical storm yesterday. At 11 p.m. last night, Talas was centred about 280 kilometres south-southeast of Ha Noi. It is forecast to move west or west-northwest at about 25 kilometres per hour across Beibu Wan towards northern Vietnam.

Weather forecast for Hong Kong (Monday, 17 Jul 2017)

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 today, 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 21:00 HKT 16/Jul/2017

STORM WARNING AREA: TONKIN.

GENERAL SITUATION AT 160900 UTC:
FOR DETAILS ON TROPICAL STORM TALAS (1704), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 161300 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2-3 M. TEMP 26-29 C. =
KWANGTUNG= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S 2-3 M. =
TAIWAN STRAIT= SE 5-6, OCNL 7 AT FIRST. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
BASHI= E TO SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
PRATAS= SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
BALINTANG= E TO SE 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL S TO SW 2-3 M. =
SCARBOROUGH= S TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S TO SW 2-3 M. =
PARACEL= SE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 2-3 M. =
TONKIN= CYCLONIC UP TO 10, BEC SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M, BEC 3-4 M. =
DANANG= SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL S TO SW 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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    South China Coastal Waters

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    Bulletin issued at 23:30 HKT 16/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 16 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 11 p.m., Severe Tropical Storm Talas with maximum sustained winds of about 90 kilometres per hour near its centre was located at 18.6 degrees north, 106.5 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:
    Southeast force 5 to 6, occasionally force 7 at first.
    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-southeast force 5
      Visibility 16 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind east force 3
      Visibility 8 Kilometres in rain

    Huangmaozhou Wind east force 6

    Macau Wind east force 3
      Visibility 24 Kilometres

    Xisha Wind southeast force 2
      Visibility 16 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 22:30 HKT 16/JUL/2017
    (Next update at 01:30 HKT 17/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL STORM TALAS HAS INTENSIFIED INTO A
     SEVERE TROPICAL STORM. AT 9 P.M., TALAS WAS
     CENTRED NEAR 18.6 DEGREES NORTH, 107.1 DEGREES
     EAST. IT IS FORECAST TO MOVE WEST OR
     WEST-NORTHWEST AT ABOUT 14 KNOTS ACROSS BEIBU
     WAN TOWARDS NORTHERN VIETNAM.
     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.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2230 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  110/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  110/15-20, OCNL 25                   29-26
   B.   2000 FT:  110/20-25                            22
   C.   5000 FT:  120/25                               18
   D.  10000 FT:  120/25                               12
   E.  18000 FT:  120/25                               MS2
   F.  24000 FT:  100/20                               MS13
   G.  30000 FT:  090/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      1100 - 1300 FT.
   I. WEATHER       : 
      CLOUDY WITH SHOWERS AND A FEW SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 10000 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) : 11200 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EAST TO SOUTHEASTERLY WINDS.  CLOUDY
     WITH SHOWERS AND A FEW SQUALLY 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.

    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 21:00 HKT on 16 Jul 17

    VHHK SIGMET 3 VALID 160900/161300 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2018 E11654 - N1848 E11206 TOP FL400 MOV NW 20KT NC= VHHK SIGMET 4 VALID 161300/161700 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N1948 E11630 - N2000 E11130 TOP FL400 MOV NW 10KT WKN=

    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 00:30 HKT 17/Jul/2017


    Tropical Cyclone Warning

    At 161500 UTC, Severe Tropical Storm Talas (1704) with central pressure 985 hectopascals was centred within 60 nautical miles of one eight point five degrees north (18.5 N) one zero six point five degrees east (106.5 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 50 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 171500 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 17/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     26.1 C
Grass Minimum Temperature                   26.2 C
Relative Humidity                        83 - 97 Percent
Rainfall                                    21.0 mm 
Total rainfall since 1st January          1373.0 mm
Against an average of                     1276.0 mm

Other Stations                Min                  Max
King's Park                  25.8 C               28.5 C
Wong Chuk Hang               25.8 C               29.9 C
Ta Kwu Ling                  25.7 C               30.2 C
Lau Fau Shan                 24.6 C               28.9 C
Tai Po                       25.5 C               29.2 C
Sha Tin                      26.6 C               29.9 C
Tuen Mun                     25.4 C               30.9 C
Tseung Kwan O                25.9 C               28.9 C
Sai Kung                     26.0 C               29.6 C
Cheung Chau                  25.0 C               29.2 C
Chek Lap Kok                 26.0 C               31.5 C
Tsing Yi                     25.9 C               30.1 C
Shek Kong                    26.3 C               29.4 C
Tsuen Wan Ho Koon            24.9 C               27.5 C
Tsuen Wan Shing Mun Valley   25.4 C               28.8 C
Hong Kong Park               25.1 C               29.4 C
Shau Kei Wan                 25.2 C               28.8 C
Kowloon City                 25.1 C               28.5 C
Happy Valley                 26.5 C               30.5 C
Wong Tai Sin                 25.8 C               28.8 C
Stanley                      25.5 C               30.1 C
Kwun Tong                    25.5 C               28.9 C
Sham Shui Po                 25.9 C               29.6 C
Kai Tak Runway Park          25.8 C               29.4 C
Yuen Long Park               25.2 C               29.1 C
Tai Mei Tuk               25.7 C               28.8 C

Duration of sunshine (King's Park):              0.6 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 5.
 

Yesterday's (16 Jul 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                           0.07
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                      0.12
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 16 Jul
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