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Bulletin issued at 19:16 HKT 17/Jul/2017

At 7 p.m. at the Hong Kong Observatory the air temperature was 25 degrees Celsius and the relative humidity 97 per cent.

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

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 9:30 p.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 24 degrees;
Tai Po 25 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 24 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 24 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 24 degrees;
Stanley 25 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 25 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 24 degrees.

Between 5:45 and 6:45 p.m., the rainfall recorded in various regions were:

Sai Kung 20 to 30 mm;
Southern District 16 to 30 mm;
Eastern District 20 to 29 mm;
Islands District 2 to 29 mm;
Kwun Tong 22 to 23 mm;
Wong Tai Sin 18 to 23 mm;
Kowloon City 13 to 22 mm;
Sha Tin 9 to 19 mm;
Central & Western District 7 to 17 mm;
Tai Po 5 to 17 mm;
Wan Chai 16 to 17 mm;
Yau Tsim Mong 11 to 12 mm;
Sham Shui Po 7 to 12 mm;
Tsuen Wan 5 to 9 mm;
Kwai Tsing 6 to 9 mm;
North District 2 to 8 mm;
Yuen Long 4 to 6 mm;
Tuen Mun 2 to 5 mm.


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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Bulletin updated at 18:45 HKT 17/Jul/2017

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

An active southerly airstream is bringing thundery showers to the coast of Guangdong and the northern part of the South China Sea. Locally, more than 30 millimetres of rainfall were recorded over Hong Kong Island, Kowloon East and the New Territories East in the past couple of hours.

Tropical Storm Talas has weakened into a tropical depression. At 7 p.m., Talas was centred about 280 kilometres west-northwest of Vientiane. It is forecast to move west or west-northwest at about 30 kilometres per hour across the inland areas of Indo-China and dissipate gradually.

Weather forecast for tonight and tomorrow

Cloudy with showers and a few squally thunderstorms. Showers will be heavy at times. Temperatures will range between 25 and 29 degrees tomorrow. Moderate to fresh south to southeasterly winds.

Outlook : Showers will ease off with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 18/07/2017; 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 09:45 HKT 17/Jul/2017

GALE WARNING AREAS: TONKIN AND DANANG.

GENERAL SITUATION AT 162100 UTC:
FOR DETAILS ON TROPICAL STORM TALAS (1704), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 170145 UTC:

HONG KONG= E TO SE 5-6. DOWN TO 1000 M IN SCT SQUALLY HEAVY SHOWERS AND TS. SEA 2-3 M. SWELL S 2-3 M. TEMP 29-26 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. DOWN TO 2000 M IN SCT SQUALLY 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= S TO 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= S TO SE 6-7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. =
DANANG= S TO SE 6-7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. 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 19:30 HKT 17/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 17 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    An active southerly airstream is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South to southeast force 5 to 6, occasionally force 7.
    Scattered heavy squally showers and thunderstorms.
    Moderate to rough seas.

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

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5, up to force 6 at first. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind variable force 1
      Visibility 870 Metres

    Shantou Wind east-southeast force 2
      Visibility 3900 Metres in showers

    Dongsha Wind southeast force 3
      Visibility 8 Kilometres in showers

    Huangmaozhou Wind south-southeast force 7

    Macau Wind south force 3
      Visibility 12 Kilometres in showers

    Xisha Wind southeast force 2
      Visibility 25 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 17/JUL/2017
    (Next update at 01:30 HKT 18/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN ACTIVE SOUTHERLY AIRSTREAM IS BRINGING
     UNSETTLED WEATHER TO THE SOUTH CHINA COASTAL
     AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  130/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  140/15-20                            26-30
   B.   2000 FT:  140/20-25                            21
   C.   5000 FT:  150/25                               18
   D.  10000 FT:  160/25                               10
   E.  18000 FT:  160/20                               MS3
   F.  24000 FT:  150/15                               MS13
   G.  30000 FT:  120/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      CLOUDY WITH SHOWERS AND A FEW SQUALLY
      THUNDERSTORMS. SHOWERS WILL BE HEAVY AT TIMES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS, OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH SOUTH TO SOUTHEASTERLY WINDS.
     CLOUDY WITH SHOWERS AND A FEW SQUALLY
     THUNDERSTORMS. SHOWERS WILL BE HEAVY AT TIMES.=

    ===================================================================
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 17:00 HKT on 17 Jul 17

    VHHK SIGMET 2 VALID 170500/170900 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2200 E11730 - N2000 E11130 TOP FL400 MOV WNW 10KT NC= VHHK SIGMET 3 VALID 170900/171300 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2200 E11730 - N2000 E11130 TOP FL400 MOV WNW 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 09:50 HKT 17/Jul/2017


    Tropical Cyclone Warning

    At 170000 UTC, Tropical Storm Talas (1704) with central pressure 990 hectopascals was centred within 60 nautical miles of one nine point zero degrees north (19.0 N) one zero four point zero degrees east (104.0 E) and is forecast to move west or west-northwest at about 15 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 180000 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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